V
ARIABLE
S
PEED
C
ONTROLLER
A
LARMS
GasTrac Process Air Heater
UGD014/0497
6-10
T
ROUBLESHOOTING
Alarm
Power Loss
Under Voltage
Over Voltage
Motor Stall
Possible cause
DC Bus Voltage remained
below 85% nominal for
more than 5 seconds on
power up.
DC Bus Voltage fell below
the minimum.
DC Bus Voltage exceeded
the maximum.
Motor has stalled.
Solution
Check for proper incoming AC
voltage.
Check for low incoming AC
voltage or power interruption.
The under voltage trip point
for 200-240 VAC units is: 210
VDC, which is equal to 150
VAC incoming voltage.
The under voltage trip point
for 380-460 VAC units is: 390
VDC, which is equal to 275
VAC incoming voltage.
Bus over voltage may be
caused by motor regeneration.
Check for high incoming AC
voltage.
The over voltage trip point for
200-240 VAC units is: 410
VDC, which is equal to 290
VAC incoming voltage.
The under voltage trip point
for 380-460 VAC units is:
815VDC, which is equal to
575 VAC incoming voltage.
Check for physical or mechan-
ical blockage of the combus-
tion blower fan.
07
03
07
04
07
05
07
06
ESC
SEL
When a problem occurs, the variable speed
controller displays the parameter 07 and a
two-digit fault code. You must correct the
problem before restarting the GasTrac. To
restart after an alarm:
Turn the power disconnect
OFF
then
ON
.
Press the GasTrac
RUN
button.
1
2
WARNING: The GasTrac should be tested and
repaired only by qualified technicians equipped with the
correct tools and trained in the maintenance and repair
of electrical systems and industrial gas appliances.
!
Fault code