R7500C WIDE RANGE PROPORTIONAL TEMPERATURE CONTROLLER
11-12 Vdc
+
POWER
–
SUPPLY
MODULTROL IV
MOTOR
BALCO
MAIN SENSOR
L1
2
BLACK
ORANGE
ORANGE
YELLOW
VIOLET
BROWN
1
R7500
C
R
T1
T2
8.2K
L2
X-FORMER
M7186A1004
M7185G1000
BALCO COMPENSATION
SENSOR
1
C AND T2 ARE INTERNALLY CONNECTED. AN 8.2K OHM RESISTOR IS
PROVIDED INTERNALLY TO CORRECTLY LOAD THE R7500 OUTPUT.
2
OPTIONAL COMPENSATION SENSOR. SUBSTITUTE WITH 500 OHM
RESISTOR WHEN COMPENSATION IS NOT USED.
C7830
Fig. 4. Hookup Diagram of R7500 to Modutrol IV Motors.
ADJUSTMENTS & CALIBRATION
ADJUSTMENTS
Set the following adjustments as specified on job drawing or
as required.
TEMPERATURE SETPOINT ADJUSTMENT
Integral setpoint adjustment is provided on the R7500C.
When it is desired to use a remote setepoint adjustment, set
the integral setpoint adjustment knob to the same
temperature as the top end of the remote setpoint scale.
When using the 14002385-008 remote setpoint assembly, set
the integral setpoint knob to REMOTE. Calibration of the
remote potentiometer will then be correct.
PROPORTIONAL BAND (PB) ADJUSTMENT
This adjustment indicates the change in temperature required
at the sensor to move the final control device (i.e., valve,
damper) from one extreme position to the other (full on
to full off). The controller has the highest gain with the lowest
PB setting.
Fig. 5. View of R7500C with Cover Removed Showing
Adjustment Locations.
3
95-7205
