Rtd Settings - Watlow Micro-Based Autotuning Control SERIES 980/985 User Manual

RTD Field Calibration Procedure
Equipment Required
1K ohm precision decade resistance box with 0.01 ohms resolution.
l
Setup And Calibration
NOTE
Before calibration on an installed control, make sure all data and
parameters are documented. See Setup and Operation Charts,
Pages 26 and 28.
1. Connect the AC line voltage L1 to Terminal #4, L2 to Terminal #7, and
Ground to Terminal #8. Jumper for correct line voltage. See Chapter 2.
2. Connect the decade resistance box to Terminal #12,13 and 14 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 CAL menu. See Figure 33 on Page 37.
Press the MODE key until the rL0 prompt is displayed.
IMPORTANT:
When the MANUAL LED is ON the unit is automatlcally calibrating. Your
sequence is VERY important. Always move to the next prompt before
changing the calibration equipment.
4.
Press the AUTO/MAN key twice to enter the MANUAL mode. The unit is
calibrating when the MANUAL LED is ON.
5. At the rL0 prompt, set the decade resistance box to the correct low
setting- See the table below. Allow at least 10 seconds to stabilize.
Press the MODE key.
1
985A-2XX0-0X00
985A-3XX0-0X00
At the prompt, set the decade resistance box to the correct high
6.
rHI
setting. Allow at least 10 seconds to stabilize. Press the AUTO/MAN key
twice to exit the MANUAL mode. This pauses calibration to allow you to
exit the CAL mode.
Appendix
Calibration Low
1° 17.31
59.57
0.1 °
High
317.33
177.13
WATLOW Series 980/985 User's Manual
NOTE:
Not all parameters
will appear. They
dependent on
are
your unit type. Use
the steps that
only
apply to your unit.
Table 2-

RTD Settings.

39