Precision Control Systems 1032 - Manual (Page 10)

Model 1032 8 of 9 Part No. 5000095-1011-6 6/13/2003
Two LED's on the circuit board may be used to aid
in determining problems with the controller.
The 'SSR DRIVE'
LED
varies in intensity proportional
to the drive signal to the Solid State Relay and is
proportional to the load voltage.
The 'LOAD CURRENT'
LED
varies in intensity
proportional to the current through the load. If the
load current reaches the current limit setting, the
intensity of the 'LOAD CURRENT'
LED
will no
longer increase and the load current will remain
fixed.
TROUBLE SHOOTING:
CAUTION: High voltage exists on the supply
and load terminals of this controller, and
may exist on other equipment located near
the controller. Use extreme caution to avoid
electrical shock.
LOAD POWER IS MAXIMUM AND
CANNOT BE REDUCED:
'SCR DRIVE'
LED
is on:
Determine that the command signal is zero. To
do this, remove the command signal connector. If
the LED remains on, the circuit card has likely
failed.
'SCR DRIVE'
LED
is off:
Remove the 24Vac power connector. If the load still
has power, the SSR module has probably failed.
To determine if the SSR module is shorted, remove
the line and load connections and measure the
resistance across the line and load terminals of the
controller.If the resistance is less than 10,000
ohms, the SCR module has probably failed.
If a replacement SCR module is ordered, specify
the voltage, current rating and serial number of the
controller.
Load voltage snaps on:
Determine that the primary of the circuit transformer
is connected across the same phase as the
controller and load. (See figure 6 on page 6.) NO LOAD POWER:
The 'LOAD CURRENT'
LED
is not on, the
intensity of the 'SCR DRIVE'
LED
can be varied:
Determine that the load is wired correctly to the
controller. Determine that all fuses are “OK”. If the
voltage across the SCR module is equal to the line
voltage, the SCR module has probably failed.
If a replacement SCR module is ordered, specify
the voltage, current rating and serial number of the
failed unit.
MAXIMUM LOAD VOLTAGE CANNOT
BE REACHED:
Determine that the primary of the circuit transformer
is connected across the same supply as the
controller and load.
This problem could be caused by the primary being
connected across the load and line connection at
the controller, or across a different phase than the
controller and load. (Fig. 6 on P. 6.)
The current limit feature may prevent maximum line
voltage from being applied to the load. To determine
if the current limit feature is preventing full voltage
from being applied to the load, rotate the
potentiometer labeled "LIMIT" 1 turn counter-
clockwise. If the load voltage decreases, the load
current is being limited.
THE FOLLOWING ARE SYMPTOMS
AND POSSIBLE SOLUTIONS:
'LOAD
CURRENT'
LED
'SSR
DRIVE'
LED
COMMAND
SIGNAL
CONNECTOR
24 Vac
CONNECTOR
5 CCW W CW
Figure 8. 1032 Board Layout.
ZERO
SPAN
LIMIT