13
Alarm messages will be indicated by the following messages appearing
in the display and the red alarm LED being lit on the control panel. All
alarm messages result in the unit's operation being interrupted and
require a Manual or Automatic reset. Automatic reset can be selected
in parameters 309 and 312. In addition, the message "Trip" or "Trip
Locked" will be displayed. If "Trip Locked" is displayed, the only possible
reset is to cycle power and then perform a manual reset. Manual reset
is accomplished by means of the front panel push button or by a remote
contact closure on the appropriate control terminal. Remedies listed
with each alarm message give a basic description of the corrective
action which can be taken to correct the fault condition. For a more
detailed explanation, see the Sympton/Cause section beginning on page
21 and the application section on page 35. Also note the numbers in
parenthesis by each alarm message. These are the codes which will
appear in the Fault memory, Parameter 602. See APPENDIX
I
for more
on the Fault memory.
INVERTER FAULT (1)
This message indicates a fault in the power section of the unit. This
message may also be displayed if the unit has detected a phase loss
on the input. If a phase loss has been detected, the "Loss of Phase"
LED (D9) on the interface board will be illuminated and the "Inverter
OK" LED (D4) on the interface board will be out. This fault returns a
"Trip Locked". Also see Testing The Inverter Section, page 26.
OVER VOLTAGE (2)
This message indicates the DC Bus voltage upper limit has been
exceeded. In addition, the "High Bus Voltage" LED (D5) on the interface
board will be illuminated and the "Inverter OK" LED (D4) on the interface
board will be out. This fault can be caused by high line voltage or
regenerative energy being returned from the motor. To remedy this
fault condition, reduce the line voltage or extend the Decel Ramp. This
fault returns a "Trip". Also see Over Voltage Trips, page 38.
UNDER VOLTAGE (3)
This message indicates the DC bus voltage has fallen below the lower
limit. In addition, the "Low Bus Voltage" LED (D6) on the interface
board will be illuminated and the "Inverter OK" LED (D4) on the interface
board will be out. To remedy this fault, increase the line voltage to the
correct value for the unit rating. This fault returns a "Trip". Also see
Testing The Soft Charge Circuit, page 23.
OVER CURRENT (4)
This message indicates a short circuit on the output of the inverter.
This fault may also be caused by the unit reaching the peak current
rating too rapidly for the unit to respond with current limit. An example
may be closing an output contactor with the unit at speed and a high
inertia load. The "Overcurrent Trip" LED (D7) on the interface board
will be illuminated and the "Inverter OK" LED (D4) on the interface
board will be out. To remedy this fault, check the output wiring and
motor for short circuits. This fault returns a "Trip Locked". Also see
Over Current Trips, page 37.
ALARM MESSAGES