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Scholar V VAIVA Maintenance & Service Manual 10/2017 Rev.2
Permanent Magnet Motor Drive Fault List/LED Flash Code Operation
LED falsh codes are viewed through the sight glass in the
electrical panel cover. Note that Fault Code 1 is techni-
cally an exception, as it is the
Not Ready
state:
The
Not Ready
state is signaled by a 1 blink count. This
state signifies that the drive is not faulted, but it is in a
“wait” state, due to one of the following reasons:
• The drive has just powered-up and is awaiting a
run request
• The drive’s DC bus voltage (thereby the input
voltage) is too low
• The drive’s heatsink is below the allowed starting temperature
• The drive’s heatsink is above the allowed starting temperature
• The drive did not detect all 3 phases of the PM motor
• The drive is waiting the ASCD
The drive may or may not have a run request from its hardware inputs or the serial link,
and as soon as the condition causing the
Not Ready
state goes away, the drive will return
to the
Ready
state or the
Run
state, dependent upon a run request.
The following is a list of fault codes defined for the Bristol compressor drive:
Fault
LED Fault Description
1 Not Ready
1
See the “Not Ready” description above
2 DI LO input
2
“LO” input status invalid (based on control mode)
3 DI HI input
3
“HI” input status invalid (based on control mode)
4 Output Phase
4
Motor phase lost or OLP opened during a Run state
5 *Communication
5
Serial communication lost (based on control mode)
6 AI Range
6
0-10V Analog Input is less than 0.5V or greater than
9.5V (if AI board), or Drive hardware mode does not
support control mode selection
7 Over Current
7
Current output to motor exceeded hardware limit
8 Motor Stall
8
Motor failed to start, or stalled due to overload
9 Underload
9
Compressor is operating at a continued light load, ex:
loss of charge
10 *Heatsink (or IGBT) Over
Temp
10 Drive temperature, per on-board sensor or IGBT calcu-
lation, was too high
11 Under voltage
11 Input voltage was too low, as detected by low DC Bus
12 Over voltage
12 Input voltage was too high, as detected by low DC Bus
13 Rotor Loss
13 Motor failed to start
14 Motor temp
14 Motor temperature, per drive calculation, was too high
15 *Ground fault
15 Drive detected excessive current imbalance in motor
phases
16
&
Up
*Drive Internal Fault
16 Drive has encountered a non-serviceable drive error
*Fault does not Auto-Reset
SIGHT GLASS
