Watlow Calibrating Watlow Series 988 Family Process Controls - Manual (Page 14)

14
WATLOW Series 988 Calibration Manual
Slidewire/Current
Slidewire Feedback Input Procedure
Equipment Required
•
1K

precision decade box with 0.01

resolution
Setup and Calibration
1. Connect the AC voltage L1, L2 and ground to the proper terminals on the
Series 988. See Chapter 2 in the user's manual.
2. Connect the decade box to terminal #18 and #20 on the 988 terminal strip.
Place a jumper wire between terminal #19 and #20. Use 20 to 24 gauge cop-
per wire.
3. Apply power to the unit and let it warm up for 15 minutes. After warm up put
the unit in the CAL menu. See Page 6.
4. At the B 15 prompt, enter 1000.00

from the decade box to the Series 988.
Allow at least 10 seconds to stabilize. Press the Up key to change the upper
display to YES. Press the Mode key.
5. At the B380 prompt, remove the jumper from terminals #19 and #20 and place
it between terminals #18 and #19. Allow at least 10 seconds to stabilize.
Press the Up key to change the upper display to YES. Press the Mode key.
To conclude the slidewire feedback calibration, press the Display key.
Current Transformer Input Procedure
Equipment Required
•
DC source, 50mA minimum sourcing capacity, 0 - 5V minimum range
Setup and Calibration
1. Connect the AC voltage L1, L2 and ground to the proper terminals on the
Series 988. See Chapter 2 in the user's manual.
2. Connect the voltage source to terminal #18 and terminal #20 on the 988 termi-
nal strip. Use 20 to 24 gauge copper wire.
3. Apply power to the unit and let it warm up for 15 minutes. After warm up put
the unit in the CAL menu. See Page 6.
4. At the B 50 prompt, enter 4.72VDC from the voltage source to the Series 988.
Allow at least 10 seconds to stabilize. Press the Up key to change the upper
display to YES. Press the Mode key.
5. At the B 00 prompt, enter 0.00VDC from the voltage source to the Series 988.
Allow at least 10 seconds to stabilize. Press the Up key to change the upper
display to YES. Press the Mode key. To conclude the current transformer
input calibration, press the Display key.