Advertisement
Note:
Before setting the minimum output
potentiometer, be sure the control is not
generating an analog output signal.
For each 10% increase in range, one bar lights
on the LED bar graph. In a milliampere
application, each bar equals 2 mA. In a voltage
application, each bar equals 1V. (Refer to
Figure 4 for an example.)
Example: To set the S350P for a minimum
output of 4 mA, turn the minimum output
potentiometer clockwise until the second LED
segment lights. Slowly rotate the potentiometer
counterclockwise just until the second segment
disappears.
6. Make sure the system is stable in the
proportional mode before selecting integration.
Refer to Checkout Procedure.
7. Reinstall the cover and secure in place with the
four cover screws.
C
heckout Procedure
Follow this procedure to ensure the S350P is
connected and functioning properly.
1. Before applying power, make sure that the
installation and wiring connections comply with
job specifications.
2. Set the system for the proportional mode and
tune it for stable operation.
3. After making adjustments and electrical
connections, put the system into operation and
observe at least three complete operating cycles
to determine that the system is stable.
4. If integration is required, select the Fast (C1),
Medium (C2), or Slow (C3) integration constant.
Slow is the recommended initial setting. (Refer
to the Integration Constant section of this
bulletin.)
5. Observe operation and make additional
adjustments as necessary to obtain stable
control.
T
roubleshooting
If the control system does not function properly,
verify the proper operation mode is selected on each
module (e.g., RA/DA) and perform the following:
8 Add-On Modules—S350P Proportional Plus Integral Temperature Stage Module Product/Technical Bulletin
1. Check for proper voltage applied to the A350
control.
a. Connect a Digital Voltmeter (DVM) between
the 24V (+) and C (-) terminals located on
the A350's left side terminal block.
If an external transformer is used, select
AC volts on the DVM and verify that the
voltage is between 20 and 30 VAC.
If a Y350R Power Module is used,
select DC volts on the DVM and verify
that the voltage is between 16 and 38
VDC.
If an external DC power supply is used, select
DC volts on the DVM and verify that the voltage is
between 22 and 29 VDC.
b. If the DVM voltage is within the indicated
voltage range, proceed to Step 2.
c. If the DVM voltage is not within the
indicated voltage range, check wiring, and
then replace the Y350R or the external
transformer.
2. Check temperature sensor for proper
resistance.
a. Take an independent temperature reading
at the sensor location (T s ). Allow the
thermometer to stabilize before taking the
reading.
b. Disconnect the sensor from the control.
Using an ohmmeter, measure the resistance
across the two sensor leads. Consult the
Temperature vs. Resistance Chart (Figure
8) to verify sensor conformity.
c. Replace the sensor if its actual performance
deviates substantially from that represented
on the chart.
Advertisement
