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Chapter 8
Refer to Figure 4-5 on page 60 to locate the LEDs on the capacitance
manometer printed circuit board.
8.8
Capacitance Manometer
Troubleshooting
Table 8-4
Capacitance Manometer Troubleshooting Guide - See Figure 4-5 on page 60
Symptom
Possible Cause
Unstable reading
Mechanical vibration of capacitance manometer, faulty system ground or cable ground
Display always reads 0
Capacitance manometer cable unplugged, no ± 15 V power, faulty cable
-15V Overcurrent LED is ON
-15 V overcurrent. Defective cable, transducer, or circuit board
CG Unplugged LED is ON
The Convectron Gauge is unplugged
A/D Failure LED ON
A/D failure. Defective Normally Open converter circuit
+15V Overcurrent LED is ON
+ 15 V overcurrent. Defective cable, transducer, or circuit board
Convectron Bridge Out LED
is ON
Defective PC board, Convectron bridge circuit
CG Overcurrent LED is ON
Convectron overcurrent. Defective gauge or cable
µP Failure LED is ON
Microprocessor failure
8.9
Process Control
Troubleshooting
If the µP FAILURE LED is illuminated or flashing, there is a probable circuit
failure. Return this product for repair at a service facility designated by
Brooks Automation, Inc.
The setpoints are read from non-volatile memory into RAM when the unit
powers up. On power up, a checksum is computed and stored in RAM, and
is updated whenever a setpoint is changed. It is then periodically
re-computed from the existing setpoints and checked against the
pre-existing value. If for any reason (such as a power fluctuation or
electrical transient in the system) a setpoint becomes corrupted, this method
will trap the error.
If a setpoint is found to contain garbled data which cannot be interpreted as
a valid setpoint, the setpoint presure will be set to 0.
112
Series 358 Micro-Ion Controller Instruction Manual - 358013 - Rev. 09