Tuning and Operating, Chapter 6
42
WATLOW Series 942 User's Manual
Auxiliary
A007-1828
Options Board
A007-1954
N.O.
Contacts
(Form A)
N.C.
Contacts
(Form B)
Control Chassis - Top View
AUX1
AUX2
Auxiliary 1 (Output 3)
Auxiliary 2 (Output 4)
Using Alarms
The Series 942 has two alarm types, Process or Deviation. A
Process alarm
sets
an absolute temperature. When the process exceeds that absolute
temperature limit an alarm occurs. The Process alarm set points may be independ-
ently set high and low.
The auxiliary output de-energizes upon an alarm or power interruption to the 942'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.
When an event is ON the N.O. contacts close and the N.C. contacts open. If the L3
or L4 LED on the front panel are lit, this indicates an energized event or alarm
condition for Output 3 or 4.
Changing the Position of an Auxiliary Jumper
Whenever you change the position of a jumper, follow this procedure:
1. Remove power from the Series 942. Turn the front panel screw 90
°
counter-
clockwise.
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 38 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.
NOTE:
Depending on the
unit you order, your
control may have 0,
1, or 2 auxiliary
jumpers.
Figure 38 -
Auxiliary Jumper
Location.
