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WATLOW Series 733/734 Service Manual
Calibration, Chapter 5
RTD Calibration
˜
˜
NOTE:
Before calibration
on an installed
control, make sure
all data and param-
eters are docu-
mented. See Setup,
and Service Tables,
Pages16
and 19.
˜
NOTE:
Always press the
Time key to advance
to the next param-
eter before chang-
ing the calibration
equipment.
RTD Field Calibration Procedure
(Single & Dual RTD Only)
For model #'s: 73XX-2XXX-XXXX 73XX-5XXX-XXXX
Equipment Required:
• 1K precision decade resistance box with 0.01 resolution. For dual zone
units, two decade boxes are reqiured.
Setup And Calibration ˜
1. Connect the AC line voltage L1 and L2 to the proper terminals.
2. Connect the decade resistance box to Terminal #1, 2 and 3 for Zone 1. For
Zone 2 units connect the decade resistance box to Terminal #4, 5, 6 on the
terminal strip. Use regular 20 - 24 gauge wire of the same length and type.
3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-
up put the unit in the Calibration mode. See the beginning of this chapter.
4. At the CALy parameter, select ALL. Press the Time key. At the InLO
prompt, set the decade resistance box to 100.0. Allow at least 10 seconds to
stabilize. Press the Time key.
5. At the InHI prompt, set the decade resistance box to 317.33. Allow at least 10
seconds to stabilize. Press the Time key.
To conclude the RTD calibration, press the Time key to advance through the
Calibration mode. To continue calibrating your outputs, press the Time key
once. The unit will leave the Calibration mode if 1 minute passes between key
activations and retains all changed values.