Watlow Series V4T - Manual (Page 22)

2 2 Wa t l o w S e r i e s V 4
NOTE:
When the % indicator
light is on, the controller
is automatically calibrat-
ing. Your sequence is
VERY important. Always
move to the next param-
eter before changing the
calibration equipment.
4-20mA Input Field Calibration Procedure
Equipment Required:
• Precision current source 0-20mA minimum range with 0.01mA resolution.
Setup and Calibration
1. Connect the ac line voltage L1 and L2 to the proper terminals on the V4.
2. Connect the current source to Terminal 4 (-) and 6 (+) on the Series V4 terminal block.
Use regular 20 - 24 gauge wire. Make sure the DIP switch is set for process input, see.
3. Apply power to the controller and allow it to warm up for 15 minutes. After warm-up
put the controller in the [`CAL] menu. Select YES. Press the ‰ Advance key until 4 is
displayed.
4. Press ˆInfinity twice to enter the manual mode. The controller is calibrating when the
% indicator light is on. Make sure the controller is in the manual mode only when you
are in the correct parameters.
5. At the 4.00 parameter, set the current source to 4.00mA. Allow at least 10 seconds to
stabilize. Press the ‰ Advance key.
6. At the 20.0 parameter, set the current source to 20.00mA. Allow at least 10 seconds to
stabilize. The controller leaves the [`CAL] mode if 1 minute passes between key activa-
tions. Press ˆInfinity twice to exit the manual mode. To conclude, press the
‰ Advance
key to the next prompt or exit the [`CAL] menu.
4-20mA Output Field Calibration Procedure
Equipment Required:
• 300 Ω, 1/2 watt 10% resistor.
• 4 - 1/2 digit Digital Multimeter.
Setup And Calibration
1. Connect the ac line voltage L1 and L2 to the proper terminals of the V4. Set the multi-
meter to measure current.
2. Connect the multimeter in series with the 300 Ω resistor to Terminal 18 Positive and 16
Negative on the Series V4 terminal block. Use regular 20 - 24 gauge wire.
3. Apply power to the controller and allow it to warm up for 15 minutes. After warm-up
put the controller in the [`CAL] menu. Select YES. Press the ‰Advance key until the
4A0 prompt is displayed.
4. Press the ˆInfinity key twice to enter the manual mode. The controller is calibrating
when the % indicator light is on.
5. At the [`4A0] prompt, the multimeter should read approximately 4mA. Allow at least
10 seconds to stabilize.
6. Use the ¿Up-arrow/¯Down-arrow keys (reverse acting) to adjust the reading on the
multimeter for 3.85mA ± 0.10mA. Press the ‰Advance key.
7. At the [`2A0] prompt, the multimeter should read approximately 20mA. Allow at least
10 seconds to stabilize. The controller will leave the [`CAL] mode if one minute passes
between key activations except for 4-20mA units.
8. Use the ¿UP/¯DOWN keys (reverse acting) to adjust the reading on the multimeter
for 20.15mA ±0.10mA.
9. To conclude the 4-20mA output calibration, advance the ‰Advance key to the next
prompt or exit the [`CAL] menu.
NOTE:
Before calibration on an
installed controller,
make sure all data and
parameters are docu-
mented.