Chromalox 3901 Bedienungsanleitung

Chromalox

3901 Chromalox®

Overtemperature Controller

Issue Date

Dec 1993 User’s Manual

0037-75121

APPROVED

i Chromalox 3901 User’s Manual

Table of Contents

Sections

Section Topic Page

1 Introduction to the 3901 Controller 1

2 Installation 3

3 Operation 9

4 Calibration 13

5 Specifications 15

6 Warranty and Return Information 17

Illustrations

Figure Topic Page

1.1 Overtemperature Control Application 1

1.2 Model Identification Table 2

2.1 Removing the Back Cover 4

2.2 Mounting Dimensions 4

2.3 Mounting Diagram 5

2.4 Wiring Connections 7

3.1 Front Panel Identification 10

3.2 Set Point Limit Potentiometer 12

4.1 Zero and Span Calibration Potentiometer 13

Chromalox 3901 User’s Manual 1

The Chromalox 3901 Overtemperature Controller

gives you reliable and economical digital indicating,

overtemperature control in a compact 1/4 DIN

package. Figure 1.1 illustrates a typical overtem-

perature application.

Figure1.1

Overtemperature Control Application

Chromalox

READ

TEMP ALARM

HEAT

SOURCE SHUTDOWN

CONTACTOR

3901

OVERTEMP FOR PROCESSOR HEATER SHEATH PROTECTOR

Chromalox

READ

TEMP ALARM

3901

°F

FLOW

SWITCH LEVEL

CONTROL SHUTDOWN

CONTACTOR

AIR

FLOW LEVEL

SENSOR

HEAT

SOURCE

OVERTEMPAPPLIED WITH OTHER CUTOUT DEVICES

Section 1

Introduction to the

3901 Controller

2 Chromalox 3901 User’s Manual

Before You

Install Before proceeding with installation and operation of

your controller, it is important that you identify the

model you have purchased. This will determine how

you install and wire the controller, and how you may

apply it. Check the serial number tag on the inside

front door flap of the controller to confirm your

model number.

Figure 1.1

Model Identification Table

Model Overtemperature Controller

3901 Digital Indicating, UL Listed, FMApproved, Terminals for Remote Reset;

1/4 DIN Panel Cutout, 2.4 Inch Depth Behind Panel

Code Control Output

1 Relay, up to 230 Vac, 20 amp resistive load, SPST Latching,

Normally-Energized, Normally-Open Contact

Code Terminations

1 Barrier Strip with Screw Terminals

Code Instrument Power

1 120 Vac, +10%, -15%, 50/60 Hz

2 230 Vac, +10%, -15%, 50/60 Hz

Code Input Type/Indication Range

04 Type J Thermocouple, 0-999°F

08 Type J Thermocouple, 0-500°C

12 Type K Thermocouple, 0-1999°F

18 Type K Thermocouple, 0-1100°C

3901- 1 1 1 04 Typical Model Number

Chromalox 3901 User’s Manual 3

Section 2

Installation

Inspection &

Unpacking On receipt of your 3901 controller, immediately make

note of any visible damage to the shipment packaging

and record this damage on the shipping documents.

Unpack the controller and carefully inspect it for

obvious damage due to shipment. If any damage has

occurred, YOU must file a claim with the transporter,

as they will not accept a claim from the shipper.

Storage If the controller will not be immediately installed and

placed into operation, it should be stored in a cool, dry

environment in its original protective packaging until

time for installation and operation. Temperature

extremes and excessive moisture can damage the

instrument.

Installation

Steps Installation of the 3901 controller requires 3 steps:

Step 1 - Accessing Internal Adjustments

Step 2 - Mounting

Step 3 - Wiring

Step 1

Accessing

Internal

Adjustments

The back cover of the 3901 can be easily removed to

access the following internal adjustment:

• Set Point Limit Potentiometer (page 11)

The page number referenced above describes this

internal adjustment. Although it is not necessary, it is

easier to make this adjustment prior to mounting

and wiring the controller. If you want to establish a

Set Point Limit for your controller, read the page

referenced above before mounting and wiring the

3901.

4 Chromalox 3901 User’s Manual

To remove the back cover, loosen the two back cover

screws shown in Figure 2.1 and lift the cover off of

the controller chassis.

Loosen screw

After completing the internal adjustment(s), replace

the cover and re-secure the two screws.

Step 2

Mounting The controller should be mounted in a location free

from excessive dust, oil accumulations and moisture.

It may be mounted in any position at ambient

temperatures of 30°F to 130°F (0°C to 55°C).

Figure 2.2 gives the mounting dimensions for the

controller.

Chromalox

READ

TEMP ALARM

3.8

(96)

3.8

(96) 2.4

(61)

(19) 3.6

(92)

3.5

(89)

PANEL CUTOUT

Measurements are shown in inches.

Millimeters are shown in parenthesis.

Figure 2.2

Mounting

Dimensions

Figure 2.1

Removing the

Back Cover

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, PANEL MOUNT IN A CONTROLLED

ENVIRONMENT ENCLOSURE RELATIVELY FREE

OF CONTAMINANTS.

HAC

LAC/N

120 V AC

230 VAC

5 VA

CASE GND

REMOTE

RESET

INTERNAL

ALARM

RELAY

LISTED

35MO

20A RES 55 C 120/230 VAC

RELAY RATING

APPROVED

TC INPUT

NOTE: USE COPPER CONDUCTORS ONLY

Chromalox 3901 User’s Manual 5

1. Cut a square mounting hole (3.6” x 3.6”) in the

panel or mounting surface and place the controller

through the cutout.

2. Two mounting brackets are provided to secure the

controller in the cutout. Loosen the screws on the two

brackets. Place the mounting tabs into the mounting

holes located on the sides of the controller.

3. From the rear of the controller, tighten the screws

until the brackets are tight against the panel, securing

the controller in the panel cutout.

4. For other mounting configurations, the mounting

bracket tabs may be placed in the controller casing

vent slots.

Figure 2.3

Mounting

Diagram

Mounting Hole

Mounting Tab

Loosen Screw

6 Chromalox 3901 User’s Manual

Important

Wiring

Information

To insure that the 3901 controller performs

optimally, it is imperative that you read this section

and become familiar with “Good Wiring Practices”

critical to eliminating electrical noise. Failure to

follow good wiring practices can result in poor

temperature measurement and ineffective high limit

control.

Snubbers Snubbers should be used to protect the controller

from electrical noise generated by inductive loads

such as motors, solenoids, coils and relays operating

near the 3901 controller. The recommended snubber

is a .1uf capacitor (600 Vdc rating) in series with a

100 ohm resistor and is available from Chromalox

(PCN 314448). The wiring diagram in this manual

illustrates the snubber connection.

Good

Wiring

Practice

Read and follow these Good Wiring Practices when

connecting this and any other controller:

1. Do not run sensor leadwires and power leads

together in the same conduit or wire tray.

2. When planning the system wiring, be sure to

consider the importance of separating wiring into

functionally similar bundles—i.e. power leads,

sensor leads, output signal lines, etc. If the power

leads and sensor leads must cross, they should cross

at a 90°angle to each other (perpendicular).

3. Locate all sources of noise in your system—

motors, contacts, solenoids, etc. Then design your

system such that wiring is separated as far as

possible from these noise sources.

4. Shielded, twisted wire should be used for the

control circuit signals if they are run in parallel with

other control circuit signal wires, or if they are run

distances greater than 2-3 feet.

5. To protect against noise, use shielded cables for all

low power signal lines.

6. Additional information on good wiring practices is

available from IEEE, 345 East 47th St., NY, NY

10017. Request IEEE Standard No. 5128-1982.

Chromalox 3901 User’s Manual 7

Step 3

Wiring Make all electrical wiring connections on the back of

the controller before power is applied to the unit.

All wiring must comply with local codes, regulations

and ordinances. This instrument is intended for panel

mounting and the terminals must be enclosed with a

panel. Use National Electric Code (NEC) Class 1

wiring for all terminals except the sensor terminals.

Figure 2.4

Wiring

Connections

Instrument Power Connections

Check the serial number tag located inside the door

flap to confirm the model number of your controller.

The model number identifies the instrument power of

your controller.

Instrument Power 3901 - **1** 120 Vac

3901 - **2** 230 Vac

Make the instrument power connections for your

controller type (120 Vac or 230 Vac) as shown in

Figure 2.4.

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK, PANEL MOUNT IN A CONTROLLED

ENVIRONMENT ENCLOSURE RELATIVELY FREE

OF CONTAMINANTS.

HAC

LAC/N

120 V AC

230 VAC

5 VA

CASE GND

REMOTE

RESET

INTERNAL

ALARM

RELAY

LISTED

35MO

20A RES 55 C 120/230 VAC

RELAY RATING

APPROVED

TC INPUT

NOTE: USE COPPER CONDUCTORS ONLY

REMOTE

RESET

AC COMMON OR

230 VAC

LOAD

SNUBBER

120 or 230 VAC

AC NEUTRAL

120 or 230 VAC +

8 Chromalox 3901 User’s Manual

Sensor Input Connections

The thermocouple input is connected at terminals 7

(+) and 8 (-) as indicated by the wiring decal on the

back of the controller. The table below shows typical

color coding for the thermocouples used with this

controller:

T/C Type

Material Plus(+) Minus (-)

Iron/Constantan White Red

Chromel/Alumel Yellow Red

If shielded thermocouple wire is used, the shield

must be grounded at one end only, preferably at the

case ground (CASE GND) of the controller.

If thermocouple extension wire is required, it must

be the same type of extension wire as the

thermocouple (for example, if the thermocouple is

Type J, the extension wire must be Type J).

Alarm Output Connection

The alarm relay output connections are made at

terminals 1 and 2. Make the wiring connections as

shown in Figure 2.4, using the recommended

snubber circuit as discussed on page 6.

Remote Alarm Reset Connection

Terminals 3 and 4 are provided for connection of a

remote, normally-open reset switch. Make the reset

switch connection as shown in Figure 2.4.

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