Siemens LMG2 Series Bedienungsanleitung

Landis & Staefa Division CC1N7421E December 04, 1998 1/16

7421

Burner Controls LMG2...

Burner controls for the supervision of single- or two-stage forced draught gas or

gas / oil burners of small to medium capacity (typically up to 350 kW) in

intermittent operation.

The burner controls are certified to EN 230 and EN 298.

They carry the CE mark based on the directives for gas appliances and

electromagnetic compatibility.

The LMG2... and this data sheet are intended for use by OEMs which integrate the

burner controls in their products.

Burner controls of the LMG2... range are used for startup and supervision of single- or

two-stage gas or gas / oil burners in intermittent operation.

The flame is supervised with a detector electrode or UV flame detector QRA... (with

ancillary unit AGQ2...A27).

LMG21... / LMG22... in the same housing replace burner controls LGB21... / LGB22...

(refer to «Type summary») and, with the help of the respective adapters, burner controls

LFI7... and LFM1... (refer to «Ordering»).

Application-specific features

– Detection of undervoltages

– Air pressure supervision with function check of air pressure monitor during startup

and operation

– Electric remote reset

– Indication of error code and flame signal by means of LEDs in the lockout reset button

– Precise program times thanks to digital processing of signals

Available versions

• LMG21... / LMG22... For unlimited burner capacities (output on startup ≤120 kW)

Locking in the event of loss of flame during operation

• LMG25... For burner capacities ≤120 kW

Three repetitions in the event of loss of flame during

operation

ISO 9001

Use

2/16 CC1N7421E December 04, 1998 Landis & Staefa Division

To avoid personal injury, damage to property or the environment, the following

warning notes should be observed!

• It is not permitted to open, interfere with or modify the unit!

• Before performing any wiring changes in the connection area of the LMG2..., the

burner control must be completely isolated from the mains supply!

• Check wiring and all safety functions!

⇒Risk of explosion

• Press lockout reset button / operating button only manually (applying a force of no

more than 10 N), without using any tools or pointed objects!

• Check the connecting wires of the air pressure monitor for short-circuits (terminals 3,

6 and 11)!

• Check the electromagnetic compatibility with adjacent components!

• On applications with actuators, the actuator does not feed a position checkback signal

to the burner control.

The actuator running times must be matched to the burner control's program. An

additional safety check of the burner with the actuator must be made!

• The relevant national safety regulations must be complied with!

• Locate the ignition and detector electrode such that

– the ignition spark cannot arc over to the detector electrode!

⇒Risk of electric overloads

– the ignition spark cannot adversely affect ionization supervision!

• Installation and commissioning work may only be carried out by qualified staff!

• Observe the permissible length of the detector cables!

⇒Refer to «Technical data»

• Always run ignition cables separate from the unit and other cables while observing the

greatest possible distances!

• Before putting the burner control into operation, check wiring carefully!

• Install switches, fuses, earthing, etc., in compliance with local regulations!

• The connection diagrams shown apply to burner controls with earthed neutral. In the

case of ionization current supervision in networks with non-earthed neutral, terminal

2 must be connected to the earth conductor via an RC unit

(part no. ARC 4 668 9066 0)!

• Do not exceed the maximum permissible switching capacity of the connection

terminals!

• No mains voltage may feed back to the control´s output terminals from an external

supply or source.

When checking the functioning of devices controlled by the burner control (gas

valves, etc.), the burner control may never be plugged in!

• In the case of burners with no fan motor, an AGK25 must be connected to terminal 3

of the burner control, or else the burner cannot reliably be started up!

• For safety reasons, feed the neutral conductor to the neutral distributor on the plug-in

base, or to terminal 2, and from there to the various devices (fan, ignition transformer

and gas valves) or to an external neutral distributor!

Warning notes

Engineering notes

Mounting notes

Installation notes

Example

23745

BV2

BV1

N7421a16/0398

Landis & Staefa Division CC1N7421E December 04, 1998 3/16

It is important to achieve practically loss-free signal transmission

• Cable length may not exceed 20 m

• Never run the detector cable together with other cables

– Line capacitances reduce the magnitude of the flame signal

– Use a separate cable

• Insulation resistance

– Between detector electrode and ground: minimum 50 MΩ

– Soiled detector electrode holders reduce insulation resistance, thus supporting

creepage currents

• Earth the burner in compliance with the relevant regulations; earthing the boiler alone

does not suffice

• Observe the polarity

Burner controls LMG2... detect wrong polarity of live and neutral, in which case they

initiate lockout at the end of «TSA»

– Plug-in design like predecessor type LGB2... (refer to «Dimensions»)

– Housing made of impact-proof, heat-resistant plastic

– Housing accommodates the

- control of the microcontroller with PCB relay for load control

- electronic flame signal amplifier (ionization)

- lockout reset button with integrated red fault indication lamp and green flame signal

lamp

– Made of impact-proof, heat-resistant plastic

– Available with screw terminals AGK11

– Cable entry optionally

- from the front or laterally by means of cable gland holders AGK65 or cable holders

AGK66

- from below through two holes of 16.2 mm dia.

– Provided with catches on the two narrow sides which engage in the burner control's

housing

- must audibly click when plugging in the LMG2...

- to disengage, a screwdriver must be slightly tilted in the guiding slots; then, the

burner control slightly lifts

– For length and width of plug-in base and positions of fixing holes, refer to

«Dimensions»

Electrical connection of

ionization current and UV

detectors

Mechanical design

Burner controls LMG2...

Plug-in base

4/16 CC1N7421E December 04, 1998 Landis & Staefa Division

The type references contained in the following table refer to LMG2... with no plug-in base and with no flame

detector. For ordering information on bases and other accessories, refer to «Ordering».

Type of flame

detector Type reference

LMG2... tw

max.

min.

TSA

max.

t3n

ca.

t10

min.

t11

s ¹)

max.

t12

s ¹)

max.

Behaviour in the

event of flame failure

during operation

Burner controls for pre-purging with low flame air volume, without actuator control

Detector electrode (FE) LMG21.130A272) 87 32.6285 -- Lockout

or LMG21.230A273) 8 20 3 2.6 2 8 5 -- Lockout

UV detector QRA... LMG21.330A273) 8 30 3 2.6 2 8 5 -- Lockout

with LMG21.350A273) 830 5 4.62105 -- Lockout

AGQ2...A27 LMG21.550A273) 850 5 4.62105 -- Lockout

Burner controls for pre-purging with nominal air volume, with actuator control

Detector electrode (FE) LMG22.130A272) 8 7 3 2.6 3 8 3 12 12 Lockout

or LMG22.230A273) 8 20 3 2.6 3 8 3 16.5 16.5 Lockout

UV detector QRA... LMG22.233A27 8 20 3 2.6 3 8 3 30 30 Lockout

with LMG22.330A273) 8 30 3 2.6 3 8 3 12 11 Lockout

AGQ2...A27 LMG22.330A2703)4) 8 30 3 2.6 3 8 3 12 11 Lockout

Burner controls for pre-purging with low flame air volume, without actuator control

Detector electrode (FE) LMG25.230A27 8 20 3 2.6 2 8 5 --

Max. 3 repetitions

or LMG25.330A27 8 30 3 2.6 2 8 5 --

Max. 3 repetitions

UV detector QRA... LMG25.350A27 8 30 5 4.6 2 10 5 --

Max. 3 repetitions

with AGQ2...A27

tw Waiting time t4 Interval «TSAEnde-BV2» or «BV1-LR»

t1 Checked pre-purge time t10 Specified time for air pressure signal

TSA Ignition safety time t11 Programmed opening time for actuator «SA»

t3 Pre-ignition time t12 Programmed closing time for actuator «SA»

t3n Ignition time during «TSA»

1) Max. running time available for actuators «SA» 3) Also suited for use with direct fired air heaters

2) Also suited for use with flash-steam generators 4) Without integral fuse; use only in connection with bases

AGK86... or with an external microfuse of max. 6.3 A (slow)

Type summary

Legend

Landis & Staefa Division CC1N7421E December 04, 1998 5/16

Burner control refer to «Type summary»

Flame detectors

– Detector electrode delivered by others

– UV detector QRA... refer to data sheet 7714

Plug-in base with screw terminals AGK11

Cable gland holder AGK65

– For inserting in the plug-in base

– For 5 x Pg11, one each on the narrow sides, three on the wide side

Cable holder AGK66

– For inserting in the plug-in base

– With six knockout holes for cable entries (without cable tension relief)

- 1 x 8.8 mm dia. and 1 x 17 mm dia. (laterally)

- 3 x 7 mm dia. (on the front)

- 1 x rectangular opening 6 x 20 mm (on the front)

Pedestal AGK21

– For increasing the height to that of the LFM... or LFI7...

(refer to «Dimensions»)

RC unit ARC 4 668 9066 0

For supervision of the ionization current in networks with non-earthed neutral

PTC resistor (AC 230 V) AGK25

To generate load on terminal 3

(used with burners with no fan motor, e.g. atmospheric gas burners)

Ancillary unit for UV supervision AGQ2.1A27 (cable length 500 mm)

AGQ2.2A27 (cable length 300 mm)

Can be fitted under the plug-in base;

for dimensions, refer to «Dimensions»

Actuators (refer to data sheet 7808) SQN3...

Actuators (refer to data sheet 7804) SQN7...

Actuators (refer to data sheet 7806) SQN9...

Service adapter KF8872

For checking the functioning of the burner controls on the burner plant

– Functional check with indicator lamps

Note: with no load on the output terminals, the respective indicator lamp may

light up!

– Detector current measurement with jacks of 4 mm dia.

Test case KF8843 ¹)

For checking the functioning of the burner controls away from the burner

¹) With extended type connector for use with LMG...

Adapter / replacement types

No rewiring required

New type of burner

control Adapter

type Predecessor type

LMG21... with adapter KF8853-K LFI7...

KF8880 LFM1... / 1...-F

LMG22... with adapter KF8853-K LFI7...

KF8880 LFM1...

Ordering

6/16 CC1N7421E December 04, 1998 Landis & Staefa Division

Operating voltage AC 230 V +10 % / -15 % Weight

- Burner control approx. 158 g

Mains frequency 50 Hz -6 %...60 Hz +6 % - Plug-in base AGK11 approx. 80 g

- AGK65... approx. 12 g

Power consumption 12 VA - AGK66... approx. 12 g

Primary fuse max. 10 A (slow) Degree of protection IP 40

Mounting position optional Max. cable length terminals 8 and 10 20 m

Environmental conditions Input current at terminal 12 max. 5 A

Transport IEC 721-3-2

Climatic conditions class 2K2 Identification code to EN 298

Temperature range -40...+60 °C LMG21... / LMG22... F T L L X N

Humidity < 95 % r.h. LMG25... F T C L X N

Mechanical conditions class 2M2

Operation IEC 721-3-3 CE conformity

Climatic conditions class 3K5 According to the directives of the European Union

Temperature range -20...+60 °C Electromagnetic compatibility EMC

Humidity < 95 % r.h. 89 / 336 EEC incl. 92 / 31 EEC

Condensation, formation of ice and ingress of

water are not permitted! Directive for gas appliances 90 / 396 EEC

Terminal rating At cos ϕ≥0.6 At cos ϕ= 1

- Terminal 3 max. 2.7 A

(15 A during max. 0.5 s) max. 3 A

- Terminals 4, 5 and 7 max. 1.7 A max. 2 A

- Terminal 10 max. 1 A max. 1 A

Technical data

LMG2...

Landis & Staefa Division CC1N7421E December 04, 1998 7/16

At mains voltage UN= AC 230 V

Detector voltage across terminals 1 and 2 or ground

(AC voltmeter Ri ≥10 MΩ)AC 115...230 V

Switching thresholds (limit values)

Switching on (flame on) DC ammeter, Ri ≤5 kΩ)≥DC 1 µA

Switching off (flame off) DC ammeter, Ri ≤5 kΩ)≤DC 0.5 µA

Requested sensor current for reliable operation ≥2 µA

Max. short-circuit current across terminals 1

and 2 or ground (AC ammeter, Ri ≤5 kΩ)AC 50 µA

Note:

With the same flame quality, the detector current with LMG2... is lower than with

LGB2...!

Flame supervision takes place by making use of the conductivity and rectifying effect

of hot flame gases.

The flame signal amplifier responds only to the DC current component of the flame

signal.

⇒A short-circuit between detector electrode and ground causes the burner to initiate

lockout

For detector currents, refer to «Technical data».

C Electrolytic capacitor 100...470 µF; DC 10...25 V

FE Detector electrode

M Microammeter (Ri max. = 5000 Ω)

Flame supervision with

detector electrode

Measuring circuit

LMG2... 1

7421v01/0598

Legend

8/16 CC1N7421E December 04, 1998 Landis & Staefa Division

Operating voltage AC 230 V +10 % / -15 % Max. permissible cable lengths

QRA... to AGQ2...A27 20 m

Mains frequency 50 Hz -6 %...60 Hz +6 % (separate cable)

AGQ2...A27 to LMG2... 20 m

Environmental conditions

Transport IEC 721-3-2 Weight

Climatic conditions class 2K2 AGQ2...A27 approx. 140 g

Temperature range -40...+60 °C QRA... refer to data sheet 7714

Humidity < 95 % r.h.

Mechanical conditions class 2M2 Mounting position optional

Operation IEC 721-3-3

Climatic conditions class 3K5 Degree of protection IP 40

Temperature range -20...+60 °C

Humidity < 95 % r.h. Power consumption 4.5 VA

At mains voltage UN

AC 220 V AC 240 V

Detector voltage at QRA... (with no load)

To the end of «t10» and after a controlled shutdown DC 400 V DC 400 V

From the beginning of «t1» DC 300 V DC 300 V

Detector voltage

Loading by DC meter Ri > 10 MΩ

To the end of «t10» and after a controlled shutdown DC 380 V DC 380 V

From the beginning of «t1» DC 280 V DC 280 V

DC current detector signals with UV detector QRA... min. required max. possible

Measurement made on UV detector 200 µA 500 µA

For UV detector QRA..., refer to data sheet 7712

Ancillary unit AGQ2...A27

When used in connection with burner controls LMG2..., the UV ancillary unit

AGQ2...A27 is required.

Using circuitry (A) or (B), the quench test on ageing UV detectors can be made in two

different ways:

Type of circuitry:

(A) Operation with a permanent line

• UV test at twice the supply voltage

across the UV cell on startup and after a

controlled shutdown

(B) Operation with a controlled line

• UV test at twice the supply voltage on

startup only, during the interval between

controlled startup and air pressure signal

– No voltage at the UV cell after a

controlled shutdown

– No full substitute for mode (A)

described above since an aged UV cell

can regenerate itself

AGQ2.1A27

AQG2.2A27

Measurement made on UV detector

C Electrolytic capacitor 100...470 µF; DC 10...25 V

bl blue M Microammeter Ri max. 5000 Ω

sw black QRA... UV detector

gr grey

Flame supervision with

AGQ2...A27 and UV

detector QRA...

Legend

Connection diagram

12 211

7421a11/0598

GP/SB

R/W

QRA +

br bl rt sw

AGQ2...A27

sw bl

(B)

(A)

LMG2...

Measurement circuit

AGQ2...A27

QRA M

C+

LMG2...

7421v02/0598

Legend

Landis & Staefa Division CC1N7421E December 04, 1998 9/16

LMG21... / LMG25... LMG22...

A Start command (switching on by «R») B-B´ Interval for establishment of flame

C Operating position of burner reached C-D Burner operation

D Controlled shutdown by «R»

• Burner is immediately shut down

• Burner control is immediately ready

for new startup

AL Fault status signal (alarm) M Fan motor

BV... Fuel valve R Control thermostat / pressurestat

EK2 Remote reset button SA Actuators

FS Flame signal SB Safety limit thermostat

GP Gas pressure monitor W Limit thermostat / pressure monitor

LP Air pressure monitor Z Ignition transformer

LR Load controller

• Burner control is reset

• All contacts in the line are closed

• Fan motor «M» or AGK25 is connected

• Air pressure monitor «LP» is in idle position

• No undervoltage

Safety shutdown in the event

– the mains voltage is lower than typically AC 160 V

– a restart is made when the mains voltage exceeds AC 195 V

After no more than 24 hours of continuous operation, the burner control initiates a safety

shutdown, followed by a restart.

If the connections of line (terminal 12) and neutral (terminal 2) have been exchanged,

the burner control will initiate lockout at the end of «TSA».

• If a fault occurs, all outputs will immediately be deactivated (< 1 s)

• On restoration of power, a restart will be made with the full program sequence

• If the operating voltage drops below the undervoltage threshold (for threshold, refer to

«Functions»), a restart will be made with the full program sequence

• If there is a premature faulty flame signal during «t1» ⇒Lockout

• If the contact of the air pressure monitor «LP» has welded in the working position:

prevention of startup and, after 8.5 seconds, lockout

• If the contact of the air pressure monitor «LP» has welded in the idle position: lockout

at the end of «t10»

• If there is no air pressure on completion of «t10» ⇒Lockout

• If the burner does not ignite by the end of «TSA» ⇒Lockout

• If flame is lost during operation

⇒LMG21... / LMG22... lockout

⇒LMG25... three repetitions

When lockout occurs, the burner control can immediately be reset! In that case, keep

lockout reset button depressed for a minimum of 0.5 seconds and a maximum of 3

seconds!

Functions

SB / R / W / GP

BV1

BV2

t3n

TSA t4

7421d05/0498

t10

EK2

B´

400 ms

SB / R / W / GP

BV1

(LR) BV2

t3n

TSA t4

7421d06/1098

t10+t11

t12

EK2

B´ C

400 ms

Legend

Prerequisites for startup

Undervoltage

Checked intermittent

operation

Reversed polarity

protection

Control program in the

event of fault

Resetting the LMG2...

10/16 CC1N7421E December 04, 1998 Landis & Staefa Division

Connection diagram

LMG21... / LMG25...

Application examples

Control of actuators of two-stage or two-stage modulating burners.

Checked pre-purging «t1» with low flame air volume.

Exactly the same low flame actuator positions during startup and operation!

For information about actuators «SA»:

SQN3...: refer to data sheet 7808

SQN7...: refer to data sheet 7804

SQN9...: refer to data sheet 7806

SQN3...121... / two-stage control SQN91.140... / two-stage control

* Note: with two-stage modulating burners (with gas regulation

damper «RV»), «BV2» and the dotted connection between

terminals (*) are not required

SQN7...244 / two-stage control

¹) Wire link required only with LGB21..., not with LMG21... / LMG25...

12 210 83611 7451

R/W

GP/SB

EK2

MLP ZBV2

7421a06/0598

BV1

LMG21.../25...

LMG2... 4

LR SA

ON/OFF

SB/R/W BV1

BV2

7421a07/1098

12 210 8 3611 97451

EK2 MLP

GP/SB

R/W

ZBV1

(*)

BV2*

(*)

N1267543

b1 b2 B

III

7421a03/1098

LMG21.../22.../25...

12 210 83 611 7 451

EK2 MLP

GP/

R/W

ZBV1

BV2

NN125

364

7421a08/1098 LK

MS I

C31

III

R32 R1

ab ab ba

LMG21.../22.../25...

Zu III

LKP

III

7421d03/1098

LMG21.../22.../25...

EK2

210

3276

R/W

GP/

11 4

7421a09/1098

IIIII IVI

BV1

BV2

LKP

III III

IV IV

TSA

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