Installation and Maintenance Manual

Diagnostics
RTAE-SVX001B-EN 75
AFD xA Estimated
Junction Over Temp
Circuit
Immediate
(decel)
Latch Running
The AFD has exceeded the allowed IGBT junction
temperature. Suspect a problem with the Drive cooling
system or if occurring during start acceleration, a damaged
and/or locked rotor compressor
Local
AFD xA Excessive
AHD Inhibit
Circuit Info Latch All
The Active Harmonic Damping function of the respective
AFD is experiencing noise or glitching of the input line sync
signal and has experienced 3 inhibits in one minute or 10
inhibits in one hour.
Local
AFD xA Gate Drive
Board Over Temp
Circuit
Immediate
(decel)
NonLatch All
Thermal switch on gate-drive board indicates its
temperature exceeds 99°C
Local
AFD xA Gate Drive
Fault
Circuit Immediate NonLatch Running
Gate-drive board faults - One of the gate drive module
power supplies is out of range
Local
AFD xA Gate Drive
Low Voltage Failure
Circuit Immediate NonLatch All
The 24Vdc gate drive supply to the gate drive module has
dropped below a reliable operation threshold
Local
AFD xA Gate Drive
Module Comm Loss
Circuit
Immediate
(decel)
Latch All
Loss of communication between DSP module and Gate Drive
Module
Local
AFD xA Gate Kill
Active
Circuit Immediate Latch All
The respective drive’s gate-kill circuitry was activated (open
circuit). For RTAE, the respective compressor’s High
Pressure Cutout Switch is wired into this circuit, and will
cause an immediate shutdown of the drive and compressor
in the event of an HPC trip. A 2nd separate HPC diagnostic
will occur in conjunction with this diagnostic – see details of
the Main Processor Diagnostic “High Pressure Cutout” below
Local
AFD xA General
Failure
Circuit
Immediate
(decel)
Latch All Drive fault other than those supported in this list. Local
AFD xA Ground
Fault
Circuit
Immediate
(decel)
Latch Running
Measured ground current exceeds ground current
sensitivity.
Local
AFD xA IGBT Self
Test Failure
Circuit Immediate Latch Starting Self testing indicates one or more IGBT’s is not working. Local
AFD xA IMC 24V
Low Voltage
Circuit
Immediate
(decel)
NonLatch All
Loss of 24V on the IMC/IPC machine bus has been detected
by the AFD
Local
AFD xA
Instantaneous
Current Overload
Circuit Immediate Latch Running
The instantaneous current of any of the output phases
exceeded the drive capacity.
Local
AFD xA Invalid Drive
Command
Circuit Info NonLatch All
The AFD has reported that it had received a command for an
invalid state transition from the main processor (MP). This
diagnostic is not supported in 2.0 build
Local
AFD xA Inverter
Heatsink Over Temp
Circuit
Immediate
(decel)
NonLatch All
The IGBT heatsink temperature exceeded the cut out
temperature.
Local
AFD xA Load
Inductor High
Temperature
Circuit
Immediate
(decel)
NonLatch All
Circuitry for respective AFD “Panel Interlock Fault” was
activated. For RTAE units, the panel interlock fault input
circuitry is used to sense the state of the high limit
thermostat of its associated load inductors. A tripped (open)
state of the circuit, suggest a high temperature of the load
inductor – Check the glycol cooling loop and the control
panel ventilation
Local
AFD xA Loss of AHD
Sync Signal
Circuit Info NonLatch Running
The Active Harmonic Damping function of the respective
AFD has received no valid input line sync signals for 1 minute
Local
AFD xA Low Rotor
Flux Feedback
Circuit
Immediate
(decel)
Latch Running
The estimated rotor flux dropped below the minimum
threshold
Local
AFD xA Motor
Current Overload
Circuit
Immediate
(decel)
Latch Running
Compressor Motor Overload “Time to Trip” vs Current curve
exceeded
Local
AFD xA Non-Volatile
Memory Failure
Circuit
Immediate
(decel)
Latch Power Up
NV Memory does not pass CRC checks during initialization.
This fault will normally occur when firmware is upgraded,
and can be ignored and reset in that circumstance
Local
AFD xA Output
Phase Loss
Circuit
Immediate
(decel)
Latch Running
Drive sensed that an output phase is missing. Output phase
loss is defined as greater than 15% output current
imbalance for more than 5.0 seconds.
Local
AFD xA Over Speed Circuit Immediate Latch All
The compressor motor’s speed either exceeded Absolute
Maximum Speed, or the drive has lost control.
Local
Table 32. AFD diagnostics (continued)
Diagnostic
Name and
Source
Affects
Target Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level