Watlow Series 1500 - Manual (Page 77)

Field Calibration d Calibration
Technical Reference
Field Calibration, Appendix WATLOW Series 1500 User's Manual 77
Equipment Needed
1. One Millivolt Source (two if doing both channels simutaneously).
2. Two board connectors, Watlow P/N Z100-0285-0000.
3. One C/J (Cold-Junction) Compensator (Omega "MCJ" Series) for the T/C
(Thermocouple) type being calibrated (two if doing both channels simultane
ously).
4. T/C Extension Wire.
Wiring
1. Remove the Series 1500 from its case and attach the two Watlow board connec-
tors to the power supply board (A007-1313 or A007-1714) and the Signal Condi-
tioner board (A007-1316 or A007-1720).
• Power supply board is on the right looking at the rear of the unit.
• Signal conditioner board is on the left looking at the rear of the unit.
2. Wire correct line voltage per wiring diagrams on page 37.
3. Connect the "INPUT" terminals of the C/J Compensator (via appropriate connec-
tor & copper T/C extension wire) to the Ch-1 Signal Conditioner CH-1 Input
Terminals (observe proper polarity) per diagram on page 35.
4. If calibrating both channels at the same time, also connect a C/J Compansator to
the CH-2 terminals.
5. If calibrating one channel at a time, connect the CH-2 Signal Conditioner Input
Terminals (8 & 10) together with a short piece of wire to avoid an "Open T/C"
alarm.
6. Connect the "OUTPUT" terminals of the CJ Compensator to the mV (millivolt)
source, observing proper polarity.
Field Calibration Procedure
— Thermocouple Calibration —
The Series 1500 is shipped totally calibrated from the factory; it does not need field
calibration, and will not except in unusual circumstances. This calibration procedure
”
Use National
Electric Code
standard safety
procedures when
calibrating an
electronic control-
ler. Use grounded
test equipment,
non-conductive
tools and floor
safety mats.
Carelessness
could result in
electric shock.
”
Use care to avoid
electric shock
when working with
the Series 1500
control chassis
outside of its case.
Line voltage is
present on both
the power supply
and signal condi-
tioner circuit
boards. Careless-
ness could result
in electric shock.
1 WARNING
2 WARNING
”
1
”
2