Carrier 48LC Series Controls, Start-Up, Operation And Troubleshooting page 74

CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this warning could result in equipment
damage.
The VFD motor parameters shown in Table 35 should nev-
er be changed in the field unless authorized by Carrier Cor-
poration. Damage could occur to the motor or unit if these
are set to anything besides what is shown in the table.
These are only provided for drive or motor replacement or
future adjustments.
For proper operation, there are three jumper wires that must re-
main installed and the VFD must be set to the auto mode. The
3 jumpers are shown on the unit schematic and are connected
through a plug called PL25. These jumpers set the VFD to start
enabled, run enabled, and tie the common bus together. The
VFD has 2 LEDs on its front panel to indicate operating status.
See below and VFD Troubleshooting section for details on
VFD faults and alarms. The VFD faults can be reset with the
VFD keypad or through the SystemVu™ controller (ALERTS/
FAULTS  RESET FAULT/ALERT = Yes).
The Green LED on steady indicates power is on the VFD,
flashing Green indicates an alarm condition detected. Alarms
are advisory in nature. These indicate a problem has been de-
tected by the VFD's diagnostics but this problem will not re-
quire a shutdown.
The Red LED steady or flashing indicates a fault condition is
detected. A fault is a significant internal situation for the VFD
or Motor. Faults will typically shutdown the motor.
48/50LC 04-06 VFD TROUBLESHOOTING
When communication is successful, the SystemVu control will
provide alerts and faults that correlate to the VFD's warnings
and alarms. Table 36 shows the list of the SystemVu controller
faults and alerts and how they map to the VFD warnings and
alarms. Table 36 also lists the possible causes of these cases.
VFD Diagnostics (with Keypad)
The drive detects error situations and reports them using:
1. Green and red LEDs on the body of the drive (located
under the keypad)
2. Status LED on the control panel
3. Control panel display
4. The Fault Word and Alarm Word parameter bits (parame-
ters 0305 to 0309)
The form of the display depends on the severity of the error.
The user can specify the severity for many errors by directing
the drive to ignore the error situation, report the situation as an
alarm, or report the situation as a fault.
Faults (Red LED Lit)
The VFD signals that it has detected a severe error, or fault, by:
1. Enabling the red LED on the drive (LED is either steady
or flashing)
2. Setting an appropriate bit in a Fault Word parameter (0305
to 0307)
3. Overriding the control panel display with the display of a
fault code
4. Stopping the motor (if it was on)
The fault code on the control panel display is temporary. Press-
ing the MENU, ENTER, UP or DOWN buttons removes the
fault message. The message reappears after a few seconds if
the control panel is not touched and the fault is still active.
Alarms (Green LED Flashing)
For less severe errors, called alarms, the diagnostic display is ad-
visory. For these situations, the drive is simply reporting that it
has detected something unusual. In these situations, the drive:
1. Flashes the green LED on the drive (does not apply to
alarms that arise from control panel operation errors)
2. Sets an appropriate bit in an Alarm Word parameter (0308
or 0309)
3. Overrides the control panel display with the display of an
alarm code and/or name
Alarm messages disappear from the control panel display after
a few seconds. The message returns periodically as long as the
alarm condition exists.
Correcting Faults
The recommended corrective action for faults is shown in the
Fault Codes list in Table 36. The VFD can also be reset to re-
move the fault. If an external source for a start command is se-
lected and is active, the VFD may start immediately after fault
reset.
To reset a fault indicated by a flashing red LED, turn off the
power for 5 minutes. To reset a fault indicated by a red LED
(not flashing), press RESET from the control panel or turn off
the power for 5 minutes. Depending on the value of parameter
1604 (FAULT RESET SELECT), digital input or serial com-
munication could also be used to reset the drive. When the
fault has been corrected, the motor can be started.
History
For reference, the last three fault codes are stored into parame-
ters 0401, 0412, 0413. For the most recent fault (identified by
parameter 0401), the drive stores additional data (in parameters
0402 through 0411) to aid in troubleshooting a problem. For
example, a parameter 0404 stores the motor speed at the time
of the fault. To clear the fault history (all of Group 04, Fault
History parameters), follow these steps:
1. In the control panel, Parameters mode, select parameter
0401.
2. Press EDIT.
3. Press the UP and DOWN buttons simultaneously.
4. Press SAVE.
If diagnostics troubleshooting has determined that the drive is
defective during the warranty period, contact ABB Automation
Inc., at 1-800-435-7365, option 4, option 3. A qualified techni-
cian will review the problem with the caller and make a deter-
mination regarding how to proceed. This may involve dis-
patching a designated service station (DSS) representative
from an authorized station, dispatching a replacement unit, or
advising return for repair.
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