4-20mA Input Field Calibration Procedure
Equipment Required
l
Precision current source
0-20mA
minimum range with 0.01
mA
resolution.
Setup And Calibration
1
NOTE

J

NOTE:
Not all parameters
will appear. They
are dependent on
Before calibration on an installed control, make sure
all
data and
your unit type. Use
parameters are documented. See Setup and Operation Charts,
only the steps that
Pages 26 and 26. apply to your
unit.
1.
Connect the AC line voltage Ll to Terminal
#4,
L2 to Terminal
#7,
and
Ground to Terminal
#8.
Jumper for correct line voltage. See Chapter 2.
2.
Connect the voltage/current

source to

Terminal
#15
and
#17.
Jumper
Terminal
#16
to
# 1
7 on the Series
980/985
terminal strip.
Use regular
20
-
24 gauge wire.
.
Apply power to the unit and allow it to warm up for 15
15
minutes. After
warm-up put the unit in the CAL menu. See Figure 33 on Page 37.
Press, the MODE key until the 4A prompt is displayed.
IMPORTANT:
When the MANUAL LED is ON the-unit is
automatlcally
calibratlng. Your
sequence is VERY Important. Always move to the next prompt before
changing
the calibration equlpment.
4.
5.
6.
Press the AUTO/MAN key twice to enter the MANUAL mode. The unit is
calibrating when the MANUAL LED is ON.
At the 4A prompt, set the
mA
source to
4.00mA.
Allow at least 10
seconds to stabilize. Press the MODE key.
At the 20A prompt, set the voltage/current source to
20.00mA.
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
WATLOW Series
980/985
User’s Manual
41