Watlow Series 985 - Manual (Page 40)

NOTE:
Not all parameters
will appear. They
are dependent on
your unit type. Use
only the steps that
apply to your unit.
0 - 5 Volt Field Calibration Procedure
Equipment Required
l
Precision voltage source 0-5 volt minimum range with 0.001 volt
resolution.
Setup And Calibration
NOTE
1.
2.
3.
Before calibration on an installed control, make sure all data and
parameters are documented. See Setup and Operation Charts,
Pages 26 and 28.
Connect the AC line voltage Ll to Terminal #14, L2 to Terminal #7, and
Ground to Terminal #8. Jumper for correct line voltage. See Chapter 2.
Connect the voltage/current source to Terminal #15 and #17 on the
Series 980/985 terminal strip. Use regular 20 - 24 gauge wire.
Apply power to the unit and allow it to warm up for 15 minutes. After
warm-up put the unit in the CAL menu. See Figure 33 on Page 37.
Press the MODE key until the OU prompt is displayed.
IIMPORTANT:
When the MANUAL LED Is ON the unit is automatically calibrating. Your
sequence is VERY important. Always move to the next prompt before
changing the calibration equipment.
4.
5.
6.
Press the AUTO/MAN key twice to enter the MANUAL mode. The unit is
calibrating when the MANUAL LED is ON.
At the OU prompt, set the voltage/current source to 0.00 volts. Allow at
least 10 seconds to stabilize. Press the MODE key.
At the 5U prompt, set the voltage/current source to 5.00 volts. Allow at
least 10 seconds to stabilize. Press the AUTO/MAN key twice to exit the
MANUAL mode. This pauses calibration to allow you to exit the CAL
mode.
40
WATLOW Series 980/985 User’s Manual
Appendix