Watlow Series 942 - Manual (Page 58)

58
WATLOW Series 942 User's Manual Appendix
0 - 5 Volt Input
0 - 5 Volt Input Field Calibration Procedure
Before attempting any calibration procedure, make sure you have the
proper equipment called for in each procedure.
Equipment Required
• Precision voltage source 0-5 volt minimum range with 0.001 volt
resolution.
Setup And Calibration
1. Connect the AC line voltage L1, L2, and ground to the proper terminals on
the 942. See Chapter 2.
2. Connect the voltage/current source to Terminal #1 and #3 on the Series
942 terminal strip. Use regular 20 - 24 gauge wire.
3. 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 Page 54. Press the MODE
key until the OU parameter is displayed.
IMPORTANT:
When the RUN LED is ON the unit is automatically calibrating. Your
sequence is VERY important. Always move to the next parameter before
changing the calibration equipment. When you have completed all of the 0 - 5
Volt input calibration parameters, press the HOLD/RUN key twice. Failure to do
so will result in inaccurate calibration values.
4. Press the HOLD/RUN key twice to enter the RUN mode. The unit is
calibrating when the RUN LED is ON. Make sure the unit is in the RUN
mode only when you are in the correct parameters. See Page 55.
5. At the 0U parameter, set the voltage/current source to 0.000volts. Allow
at least 10 seconds to stabilize. Press the MODE key.
6. At the 5U parameter, set the voltage/current source to 5.000 volts. Allow
at least 10 seconds to stabilize. The unit will leave the CAL mode if 1
minute passes between key activations. Press the HOLD/RUN key twice
to exit the RUN mode. To conclude the 0 - 5 Volt input calibration,
advance the MODE key to the next parameter or exit the Calibration
menu by pressing the HOLD/RUN key twice.
NOTE:
Not all parameters
will appear. They
are dependent on
your unit type. Use
only the steps that
apply to your unit.
NOTE:
Before calibration
on an installed
control, make sure
all data and para-
meters are docu-
mented. See the
Setup and Operation
Tables, and the
Master Step Chart,
Pages 27, 30 and 35.