Watlow Series 942 - Manual (Page 8)

Install and Wire, Chapter 2
8 WATLOW Series 942 User's Manual
Power Wiring
CAUTION:
To avoid potential
electric shock, use
National Electric
Code (NEC) safety
practices when
wiring and connect-
ing this unit to a
power source and to
electrical sensors or
peripheral devices.
Figure 7 -
240 VAC Power
Wiring.
Figure 6 -
120 VAC Power
Wiring.
NOTE:
For 50 or 60Hz
operation, no
adjustment or
jumper placement
is necessary.
L1
Fuse
L2
Earth Ground
10
12
13
Fuse
How to Wire the Series 942
The Series 942 wiring is illustrated by model number option. Check the terminal
designation sticker on the control and compare your model number to those
shown here and to the model number breakdown in the Appendix of this manual.
Series 942 internal circuits appear "inside" the line drawing of the 942, while
connections and terminal designations appear "outside" the line drawing. All
outputs are referenced to a de-energized state. The final wiring figure is a typical
system example.
When you apply power without sensor inputs on the terminal strip, the Series 942
displays "- - - -" in the Upper display, and Er7 in the Lower display. This error
indicates an open sensor or A/D error. Remove power to the control and connect
the sensor properly, see Page 10. All wiring and fusing must conform to the
National Electric Code and to any locally applicable codes as well.
240 VAC
Sensor Installation Guidelines
We suggest you mount the sensor at a location in your process or system where it
reads an average temperature. Put the sensor as near as possible to the material
or space you want to control. The sensor should be thermally insulated from the
sensor mounting.
L1
Fuse
L2
Earth Ground
11
12
13
120 VAC