Danfoss PLUS+1 Series Handbuch

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MAKING MODERN LIVING POSSIBLE

Technical Information

Output Conﬁgurations for

PLUS+1® Controllers

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

Table of Revisions

Date Page Changed Rev

17 Sep 2013 All New layout EA

11 Mar 2013 6 Single Pole Double Throw Switch drawing updated DA

17 Oct, 2008 Various Various content update and literature type changed from

Tech Note to Technical Information

11 Oct, 2005 5 Changed sentence “Use digital...” B

13 Jul, 2005 1 PVG 120 photo updated A

Revisions

Revision History

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

About This Manual This publication is intended to share circuits, products and other useful application information

not otherwise found in other Danfoss publications. It is written to inform and aid the reader in the

successful application of Danfoss products.

PLUS+1 Controllers

Conﬁgurable Outputs

Driving Diﬀerent Types of Loads......................................................................................................................................... 4

Driving a Relay or ON/OFF Valve ......................................................................................................................................... 4

Driving an Incandescent Lamp............................................................................................................................................ 6

Driving a Bidirectional Proportional Valve...................................................................................................................... 7

Driving a Unidirectional Proportional Valve................................................................................................................... 9

Driving a PVE Valve................................................................................................................................................................... 9

Driving a 4-20 mA Device....................................................................................................................................................... 9

FMEA Considerations Open Ground Wire to Controller....................................................................................................................................... 10

Open Battery+ Wire to Controller..................................................................................................................................... 10

Open Ground Wire to Load................................................................................................................................................. 11

Contents

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

PLUS+1 Controllers

Conﬁgurable Outputs

Driving Diﬀerent Types of

Loads

Driving a Relay or ON/OFF

Valve

If you need to use a multi-function PWM output for ON/OFF loads, then set the conﬁguration in

the application program to one of the digital output selections. This can be push/pull, sourcing, or

sinking. (PinConﬁg = 0, 1, or 2)

Sourcing and Sinking options are not available for all pins. Please refer to the API speciﬁcation for the

particular hardware.

PLUS+1 controllers have conﬁgurable outputs that can be used to drive a variety of diﬀerent loads.

Danfoss recommends the following ways for using the PLUS+1 outputs to drive diﬀerent types of

loads.

Danfoss recommends using a digital output for ON/OFF loads, such as a relay or valve. This

encompasses outputs labeled as DOUT or DOUT/PVG Pwr. The recirculating diode across the relay coil

is optional. The internal diode will provide the same functionality. These outputs always provide a

high voltage (sourcing battery voltage) as the output when in the ON state.

Relay

Ground

+Batt

Logic

circuits

FET

Optional

2295

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

Driving a Relay or ON/OFF

Valve (continued)

It is recommended to use the push/pull conﬁguration for every situation where a load is exclusively

driven by the controller.

Sourcing conﬁguration (PinConﬁg = 1 or 0)

2296

Relay

Optional

Ground

+Batt

Logic circuits

FET

Sourcing or

Push/Pull

Conguration

FET

Sinking conﬁguration (PinConﬁg = 2 or 0)

2297

Relay

Optional

+Batt

Logic circuits

FET

Sinking or

Push/Pull

Conguration

FET

In the Sinking conﬁguration, with the load tied to +Batt there is the potential for up to 5 milliamps

leakage current through the output when it is in the OFF state.

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

Use sourcing or sinking when there are other sources tied in parallel, such as a

jog switch.

Driving a Relay or ON/OFF

Valve (continued)

Driving an Incandescent

Lamp

Danfoss only recommends using a digital output for driving incandescent lamps. This encompasses

outputs labeled as DOUT or DOUT/PVG Pwr. These outputs always provide a high voltage (sourcing

battery voltage) as the output when in the ON state.

2298

Lamp

Ground

+Batt

Logic

circuits

FET

It is not recommended to use multi-function PWM outputs for driving incandescent lamps. There are

limitations when driving incandescent lamps from multi-function outputs. An incandescent lamp has

an “inrush” current. Inrush is a spike in current just as you turn the lamp on when the ﬁlament is cold.

Multi-function outputs have a hard current limit which will trip the output oﬀ if this limit is exceeded.

When driving an incandescent lamp this can happen even though the average current requirements

for the lamp are well within the output pin’s drive capability. Depending on the inrush current, it

cannot be guaranteed that the multi-fuction output will reliably drive an incandescent lamp. This has

sometimes been eﬀectively addressed by setting the output to open loop PWM (PinConﬁg = 3) and

then ramping the PWM percentage from 0 to 100 percent, but this is not guaranteed to work for all

applications.

2395

Ground

+Batt

Logic circuits

FET

Sourcing

Conguration

FET

+Batt

Single Pole

Single Throw

Switch

2396

+Batt

Single Pole

Double Throw

Switch

Ground

+Batt

Logic circuits

FET

Sourcing

Conguration

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

Driving a Bidirectional

Proportional Valve

Option 1 – H bridge conﬁguration for single coil

Certain output pin pairs may be set for the H bridge conﬁguration. Please refer to the API

speciﬁcation for the pinouts on a particular hardware. This is an open loop PWM conﬁguration

(PinConﬁg = 7).

2299

Load

Ground

+Batt

Logic circuits

FET

H-bridge

Conguration

FET

Logic circuits

FET

H-bridge

Conguration

Option 2 – closed loop current controlled conﬁguration for single coil

You may also use two outputs conﬁgured for closed loop current control to drive a bi-directional

valve. Certain output pin pairs may be used for this conﬁguration (PinConﬁg = 8). Set the current

command to the desired milliamps. Please refer to the API speciﬁcation for the pinout pairs available

on a particular hardware.

2300

Load

Ground

+Batt

Logic circuits

FET

Logic circuits

FET

PWM Closed

Loop Current

Conguration

PWM Closed

Loop Current

Conguration

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

Option 3 – push/pull conﬁguration for dual coil

You may also use two outputs to drive a bidirectional dual coil valve such as a dual coil EDC when

wired as shown below. This conﬁguration will allow you to check the resistance of the coils for more

accurate diagnostics. Setting PinConﬁg = 4 on both outputs will give closed loop current control.

Refererence FMEA Considerations, pages 10 and 11.

2302

Coil A

Coil B

Ground

+Batt

Logic circuits

FET

Logic circuits

FET

PWM Closed

Loop Current

Conguration

PWM Closed

Loop Current

Conguration

Driving a Bidirectional

Proportional Valve

(continued)

2303

Coil A

Coil B

Ground

+Batt

Logic circuits

FET

Logic circuits

FET

PWM Closed

Loop Current

Conguration

PWM Closed

Loop Current

Conguration

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

Driving a Unidirectional

Proportional Valve

It is recommended to use PWM conﬁguration for unidirectional proportional valves. This may be set

for open loop PWM (PinConﬁg = 3) or closed loop current control (PinConﬁg = 4 or 5). Recirculating

diodes across the load should never be used if the valve requires closed loop current control. They are

optional for open loop PWM control.

Refererence FMEA Considerations, pages 10 and 11.

2304

Load

Ground

+Batt

Logic circuits

FET

PWM Open

Loop

Conguration

FET

Driving a PVE Valve When driving a Danfoss PVE valve, it is recommended to use the PVE output conﬁguration

(PinConﬁg = 6). Set the PWM frequency at 4000 Hz.

2305

PVE

+Batt

Ground

+Batt

Logic circuits

FET

PWM Open

Loop

Conguration

FET

Driving a 4-20 mA Device Driving a 4-20 mA device is not recommended. The minimum controllable current is presently about

10 mA in the closed loop push/pull conﬁguration.

Technical Information Output Conﬁgurations for PLUS+1® Controllers

520L0922 • Rev EA • Sep 2013

FMEA Considerations One consideration during a system FMEA (Failure Mode Eﬀects Analysis) on an application is the

possibility of an open wiring connection. Here are three examples.

Eﬀects of an Open Ground

Losing the ground connection can cause the battery current to ﬁnd another path to ground if it is

available. When the load is grounded externally, rather than through the controller, such a path is

available. Current will ﬁnd its way through the load even when the output is in the OFF state. This may

result in unintentional movement of the function that is controlled by the load.

Below is a simple schematic to show how this can happen. The arrows indicate the path of current.

2306

Load

Ground

+Batt

Logic circuits

FET

Conguration

FET

Open

The only way to remove the current completely is to return the load current back to the controller,

through another output. If you are driving an EDC type load (dual coil) and are driving both coils to

get a forward / reverse type function, this could be done by driving one coil bi-directionally with no

additional outputs consumed.

If there are enough valves connected to the controller to provide multiple current paths, you might

be able to reduce the amount of current in each valve enough so that it is no longer above the

threshold of any one valve.

If you have multiple ground connections to the controller, you might be able to reduce the

occurrence of the fault enough so that it no longer a signiﬁcant risk (rates below 100 on the System

FMEA.) You may also be able to improve the wiring integrity to minimize the occurrence of the fault.

Open Battery+ Wire to

Controller

Open Battery+ Wire

Losing the Battery + connection can cause the battery current to ﬁnd another path to ground if it is

available. When the load is tied to Battery+ externally, rather than through the controller, such a path

is available. Current will ﬁnd its way through the load even if the output is in the OFF state. This may

result in unintentional movement of the function that is controlled by the load.

Open Ground Wire to

Controller

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