Watlow Series 965 - Manual (Page 32)

32
WATLOW Series 965 User's Manual Appendix
Process Input
0-5 Volt Input Field Calibration Procedure
Equipment Required:
• Precision DC voltage source 0-5 volt minimum range with 0.001 volt resolution.
Setup and Calibration
1. Connect the AC line voltage L1 and L2 to the proper terminals on the 965.
2. Connect the voltage/current source to Terminal 3 (+) and 5 (-) on the Series 965
terminal strip. Use regular 20 - 24 gauge wire. Make sure the DIP switch is set for
process input, see Chapter 4.
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 Figure 27 on Page 29. Select YEs. Press the
MODE key until 0.00 is displayed.
4. Press A/M twice to enter the MANUAL mode. The unit is calibrating when the MN
LED is on. Make sure the unit is in the MANUAL mode only when you are in the
correct parameters. See Figure 28 on Page 30.
5. At the 0.00 parameter, set the voltage source to 0.000 volts. Allow at least 10
seconds to stabilize. Press the MODE key.
6. At the 5.00 parameter, set the voltage source to 5.000V Î (VDC). Allow at least 10
seconds to stabilize. The unit leaves the CAL mode if 1 minute passes between key
activations. Press A/M twice to exit the MANUAL mode. To conclude the 0-5 Volt
calibration, advance the MODE key to the next prompt or exit the CAL menu.
4-20mA Input Field Calibration Procedure
Equipment Required:
• Precision current source 0-20mA minimum range with 0.01mA resolution.
Setup and Calibration
1. Connect the AC line voltage L1 and L2 to the proper terminals on the 965.
2. Connect the current source to Terminal 2 (-) and 5 (+) on the Series 965 terminal
strip. Use regular 20 - 24 gauge wire. Make sure the DIP switch is set for process
input, see Chapter 4.
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 Figure 27 on Page 29. Select YEs. Press the
MODE key until 4 is displayed.
4. Press A/M twice to enter the MANUAL mode. The unit is calibrating when the MN
LED is on. Make sure the unit is in the MANUAL mode only when you are in the
correct parameters. See Figure 28 on Page 30.
5. At the 4.00 parameter, set the current source to 4.00mA. Allow at least 10 seconds
to stabilize. Press the MODE key.
6. At the 20.0 parameter, set the current source to 20.00mA. Allow at least 10 seconds
to stabilize. The unit leaves the CAL mode if 1 minute passes between key activa-
tions. Press A/M twice to exit the MANUAL mode. To conclude, advance the MODE
key to the next prompt or exit the CAL menu.
NOTE:
When the MN LED is
on, the unit is
automatically
calibrating. Your
sequence is VERY
important. Always
move to the next
parameter before
changing the
calibration equip-
ment.
NOTE:
Before calibration
on an installed
control, make sure
all data and
parameters are
documented. See
Setup and Operation
Charts, Pages 18
and 20.