Manual
Field Calibration
Technical Reference
Field Calibration, Appendix
WATLOW Series 1500 User's Manual 75
Use the regular
resistance values
(in parenthesis)
for calibrating JIS
Curve #3916. Use
the resistance
values in brackets
for calibrating DIN
Curve #3850.
Field Calibration Procedure
— RTD 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
will enable you to calibrate the Series 1500 low voltage analog input and output
signals for accuracy.
Equipment Needed
1. Two 100 ohm decade boxes.
2. Two board connectors, Watlow P/N Z100-0285-0000.
3. Digital voltmeter.
Wiring
1. Remove the Series 1500 from its case and attach the two Watlow board
connectors to the power supply board (A007-1313 or A007-1714) and the
signal conditioner board (A007-1316 or A007-1719).
• 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 decade box for Channel 1: S1 to Term. 5, S2 to Term. 6, and S3 to
Term. 7. Short S2 to S3 at decade box.
4. Connect decade box for Channel 2: S1 to Term. 8, S2 to Term. 9, and S3 to
Term. 10. Short S2 to S3 at decade box.
Calibration
1. Document DIP Switch positions and all values in Guarded Access, pp. 53 & 55.
2. Check DIP Switches if #7 is OFF use °F values, #7 is ON, use °C values.
3. Set Ch-1 and Ch-2 inputs to (136.59) [135.97] ohms.
4. Connect DVM, (-) minus to Term. 1, (+) plus to test point E-120 on signal
conditioner board.
5. Power up control. It will power up with Ch-1, °F or °C and Monitor Data
LED lit. Step flashes A1, hit CLEAR to stop. If the program halt LED is not lit,
press RUN/HALT key.
6. Adjust span pot for 5.000VDC on DVM.
”
”
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.
”
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.
NOTE:
2 WARNING
1 WARNING
”
1
2