Honeywell PM7600B Manual page 49

Fan Motor Failure
Compressor 1: Failed to Pump Out
Compressor 2: Failed to Pump Out
Compressor 3: Failed to Pump Out
Compressor 4: Failed to Pump Out
Control Lockout—Reset W7600
Compressor 1: Locked Out—Reset W7600
Compressor 2: Locked Out—Reset W7600
Compressor 3: Locked Out—Reset W7600
Compressor 4: Locked Out—Reset W7600
Return Duct High Static Pressure
Return Duct Low Static Pressure
Return Fan Failure-No Air flow
Mixed Air Temperature High
Mixed Air Temperature Low
An outline of W7600A-F Control Module troubleshoot-
ing follows:
Troubleshooting Background
Troubleshooting Critical Device Failures
• ROM (Read-Only Memory) failure.
• RAM (Random Access Memory) failure.
Troubleshooting Major Device Failures
• RTC (Real-Time Clock) failure.
• A/D calibration failure.
• A/D (Analog/Digital) 50/60 Hz line failure.
• W7601A,B required and not present.
• Bad 50/60 Hz line.
• Q7600G failure.
• Q7600G off-line.
• System clock bad.
Troubleshooting Minor Device Failures
• Watchdog failure.
• Checksum failures.
— AI (Analog Input) configuration file lost.
— DI (Digital Input) configuration file lost.
— AO (Analog Output) configuration file lost.
— DO (Digital Output) configuration file lost.
— RA (Remote Analog) configuration file lost.
— RD (Remote Digital) configuration file lost.
— PD (Pseudo Digital) configuration file lost.
— PA (Pseudo Analog) configuration file lost.
— Day Schedule assignments lost.
— Global/Remote point configuration file lost.
— Clock parameters lost.
— Control number configuration file lost.
— TOD (Time-Of-Day) event schedule parameters
lost.
— Special schedules lost.
— Analog alarm program lost.
— Digital alarm program lost.
— Access code lost.
— System alarm priority configuration file lost.
— System setpoint configuration file lost.
— Application model configuration lost.
TROUBLESHOOTING BACKGROUND
While the W7600 is in the run mode, internal circuitry is
checked constantly. A failure causes a specific device
failure alarm to be set. The user can configure the alarm
priority of device failures through the ZM7601/ZM7603
Software.
All alarms are reported to the CNAP communications
network. The user can configure the Q7640 Network Inter-
face Unit through the ZM7601/ZM7603 software to report
alarms to a remote personal computer. The user may ac-
knowledge alarms locally using the S7600A Keyboard
Display Module and also remotely using the ZM7601/
ZM7603 Software. If a local user acknowledges an alarm
through the S7600A, it is only acknowledged locally. If a
remote user acknowledges an alarm through ZM7601/
ZM7603 Software, it is only acknowledged remotely. These
two acknowledgment processes are totally separate.
During normal operation, the LED (Light Emitting Di-
ode) on the W7600A-F base unit blinks at a one Hertz rate,
which is equivalent to one on and off blink per second. If a
minor or major failure occurs, the LED will blink at a rate
2.5 times faster than the normal blinking mode. This is
equivalent to 25 on and off blinks in a 10-second interval. If
the W7600A-F ROM fails, the LED will be on for about
four seconds and go off for about one second, with this
cycle repeating until the problem is corrected. If the
W7600A-F RAM fails, the LED will be on for about one
second and blip off for about one tenth of a second, with this
cycle repeating until the problem is corrected.
TROUBLESHOOTING CRITICAL DEVICE
FAILURES
Critical device failures typically result in the temporary
or permanent disability of the W7600A-F Control Module,
requiring replacement of the module.
Because of the nature of the failure, it is not possible to
log the event in the Q7640 Network Interface Unit alarm
file, the W7600A-F alarm file, or to display a message on
the S7600A.
Failure ROM (Read-Only Memory)
failure.
Symptoms W7600A-F Control Module LED off
for one second and on for four sec-
onds.
Cause ROM checksum test failed in base
firmware.
W7600A-F Retest checksum to verify failure.
Action Shut down.
Remedies • Turn off and reapply power to the
• Remove EPROM.
• Examine EPROM for bent pins.
• Ensure EPROM is for W7600 ap-
• Remove all accessories including
• Remove all I/O connections.
• Repeat the process. If these efforts
49
TROUBLESHOOTING/ALARMS
device and observe the result.
plication.
the W7601A,B; Q7600G.
fail to correct the problem, replace
the W7600A-F Control Module.
63-4309—2
PM7600B