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Alarm wiring, Changing the position of an alarm jumper – Watlow Series 945 High/Low Limit Control User Manual

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WATLOW Series 945 High/Low Limit User's Manual

Alarm Wiring

Off state impedance is 20K

minimum.

945A- _ _ _

2

- _ 000

Figure 9 -
Alarms Option
Wiring Diagram.

Alarm Outputs, Form A or B, 6 Amp Mechanical Relay

Changing the Position of an Alarm Jumper

Whenever you change the position of a jumper, follow this procedure:

1. Remove power from the Series 945. Turn the front panel screw 90

°

counterclockwise.

2. Grip the front panel bezel and pull it straight out from the control case. The

control chassis will come out of the case as you pull the bezel.

3. Set the jumper to the position you want. See Figure 10 for jumper location.

4. Return the control chassis to the case. Be sure you have it oriented

correctly. It will not fit in upside down, but check just the same. Press
firmly, but gently, to seat the chassis.

Figure 10 -
Alarms Jumper
Location.

NOTE:

Depending on the
unit you order, your
control may have 0,
1, or 2 alarm jump-
ers.

NOTE:

The alarm output de-energizes upon an alarm or power interruption to the 945's power
supply. When you select N.O. Contacts, the contact is open when an alarm occurs.
When selecting N.C. Contacts, the contact closes when an alarm occurs.

A007-1828

Options Board

A007-1789

N.C.

Contacts
(Form B)

Control Chassis - Top View

N.O.

Contacts
(Form A)

Alarm 1

Fuse

L1

L2

26

27

Alarm 2

Fuse

L1

L2

24

25

AL2

AL2

AL2

AL2

Output 3

Output 2

Output 3

Output 2