Series 360, Granville-Phillips, Stabil-Ion, Ionization, Vacuum ...

6 Service and Maintenance
Symptom
Green +15 LED out.
Green -15 LED out.
Green +5 display LED out.
Green +5 logic LED out.
Possible Cause
+15 volt supply faulty (power to analog circuitry and RS-232).
-15 volt supply faulty (power to analog circuitry and RS-232).
+5 volt supply to display LED's faulty.
+5 volt logic supply faulty.
6.3 Fault Relay
When supplied with the available factory installed Stabil-Ion Remote
Control (Cat. No. 360104), the 360 Control Unit is equipped with a “Fault”
relay. The SPDT relay contacts are located on the remote output connector
(See Figure 6-1). The relay is energized when no fault condition is detected.
The relay is de-energized when:
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There is a fault condition detected by one of the microprocessors.
There is a microprocessor failure causing the watchdog timer to reset.
Power is lost due to Power Supply failure.
Power is removed from the instrument.
The power switch is turned off.
Figure 6-1
Control Board Top
View Showing Green
Power Indicator LED’s.
The source of the fault signal can be determined by observing the fault indicating red LED's and the
Power Supply monitor's green LED's located beneath the Control Unit's cover (see Figure 1-8 on
page 1-6). A list of specific causes are described in Table 6-2.
Table 6-2
Fault Cause/Action.
Cause
Microprocessor reset occurring on some module (probable
circuit failure).
Unplugged Convectron Gauge.
Sensor broken in Convectron Gauge.
Action
Cycle power.
Call Qualified Service Technician.
Plug in gauge.
Replace gauge.
Convectron Gauge zero badly out of calibration. Adjust zero calibration. See Section 4.9 on page 4-24.
Checksum failure on Process Control board.
Cycle power and check all setpoints.
6-4
Series 360 Stabil-Ion December, 2001