Process, Process field calibration procedure, Figure 40 – Watlow Series 922 User Manual
Page 75
Appendix
75
WATLOW Series 922 User's Manual
Process
+
-
6
8
7
3
4
5
Series 922
Terminal Strip
Channel 2
Series 922
Terminal Strip
Channel 1
Voltage/Current
Source
(+)
( -)
Figure 40 -
Voltage/Current
Source to Series 922
Connection Diagram
Process Field Calibration Procedure
Equipment Required
•
4-1/2 digit, digital voltmeter (DVM).
•
Precision voltage/current source.
Setup and Calibration
NOTE: Before calibration on an installed control, make sure all data and
parameters are documented.
1.
Connect the voltage/current source to #6 Positive and #8 Negative on the
Series 922 terminal strip for Channel 1 [#4 Positive and #5 Negative for
Channel 2]. See Figure 40.
2.
Connect AC line voltage, L1 to #17, L2 to #20, ground to #21 on the Series
922 terminal strip. Jumper for correct line voltage. See Chapter 4, "How to
Install and Wire".
3.
Set DIP Switch #6 ON. Apply power to the 922 and allow it to warm up for
15 minutes. The unit should be in the TEST mode.
4.
Connect DVM common to TP2 and DVM positive to TP1 on the A007-
1728 or A007-1729 circuit board, located on the top side behind the center
chassis support. This circuit board is dependent on your model number.
Your unit will have only one of these boards. DVM should be set up for DC
volts, and in a range capable of displaying 6.3000 volts.
5.
Press the MODE key until DAS6 XXXX appears on the alphanumeric
display. Use the UP/DOWN keys to adjust the alphanumeric display on the
922 to match the reading on the DVM. Once the two readings match,
press the ENTER key.
6.
Press the MODE key until CH1Z XXXX appears on the alphanumeric
display for Channel 1 [CH2Z XXXX for Channel 2]. ENTER 0mA, press
ENTER. Allow 10 seconds for stabilizing, press the ENTER key.
7.
Press the MODE key until CH1G XXXX appears on the alphanumeric
display for Channel 1 [CH2G XXXX for Channel 2]. Input 20mA, press
ENTER. The unit is now calibrated for Channel 1 process inputs. The
process readings on the ACTUAL display should be at the R1H (or R2H)
setting.
8.
Remove power from the Series 922. Remove wires from #6 and #8 for
Channel 1 [#3 and #5 for Channel 2]. Set DIP Switch #6 to the OFF
position.