Troubleshooting - PowerTec 2000C Instruction Manual

6.7 TROUBLESHOOTING

When troubleshooting the Model 2000C or Model
3000C, it is just as important to know WHEN something
happens as it is to know WHAT happens. In other words,
the SEQUENCE OF EVENTS is important in trying to
resolve what, if any, problems there may be. There may be
times when it seems that something is wrong, but the
problem may actually be in the sequence of events.
A Start Up Procedure is shipped with each control.
It should be used to put the unit into operation and may also
be used to find problems. If problems are experienced in
the operation of the control, go back and follow the start up
procedure from the beginning, and make note of when and
how things go wrong. This way, POWERTEC's service
personnel will be able to pinpoint the problem more easily.
EFFECTIVE AND EFFICIENT TROUBLESHOOT-
ING ALSO REQUIRES A SUPPLY OF SPARE PARTS
FOR THE EQUIPMENT BEING WORKED ON.
Before attempting to do any troubleshooting, study
Figure 13 on page 4-2 (standard connection diagram), read
Sections 4 and 5 of this manual, and look at the power
diagram (Figure 28 on page 5-11) and the block diagram on
page 6-7 (Figure 31). This will familiarize you with the
circuitry involved.
The LED indicators are designed to give a ready
indication of the status of the control. They are an immedi-
ate visual reference of the present conditions in the drive,
and may be used as a troubleshooting aid. It is recom-
mended that the status of these LED's be checked fre-
quently while starting up and/or troubleshooting the drive.
Using the LED indicators, here are some suggestions
as to possible problems and solutions, based upon the
electrical wiring of the Model 2000C and the Model 3000C
(follow the suggestions in the order given):
PWR LED (green)
This LED should be ON whenever there is power applied
to the control. If the LED is not ON:
1. Check incoming power.
2. Turn off power, wait 3 minutes, and check fuses FU1, FU2,
FU3, and FU4.
3. Reapply power, and check the following power supplies:
TB2 terminal 12 is common
+24VDC at TB2 terminal 8
+24VDC at TB2 terminal 17
-24VDC at TB2 terminal 3
+10VDC at TB2 terminal 10
+5VDC at TB1 terminal 8
If supplies are O.K., the LED may be bad.
4. Change Current Controller Board.
5. Change Driver Board.
6. Change power transformer T1.
7. Change entire controller.
© copyright 1992, 1996 by Powertec Industrial
Motors
BUS LED (red on power-up, then green)
This LED should be RED when power is first applied, then
change to green within 30 seconds.If it stays RED for more than
30 seconds:
1. Check incoming power.
2. Turn off power, wait 3 minutes, and check all fuses (including
the one on the capacitor board).
3. Reapply power and listen for the contactor CR1 on the
chassis pulling in.
4. Replace Current Sensor Board.
5. Replace Current Controller Board.
OV / UV (red)
This LED will come on to indicate several adverse condi-
tions which cause an electronic trip. If this LED comes on:
1. Check the incoming power.
2. Turn off power, wait 3 minutes, and check the fuses.
3. Reapply power and listen for the CR1 contactor pulling in.
4. Check the bus voltage (see capacitor board layout in Figure
29 on page 6-3).
If bus voltage is greater than 1.6 times nominal line voltage for
that unit, the trip is overvoltage (OV).
If bus voltage is less than 1.2 times nominal line voltage for the
unit, it is undervoltage (UV).
It is best to check the bus voltage while running under load.
5. Replace Current Sensor Board.
6. Replace Current Controller Board.
PL (red)
This LED indicates one of several power problems on the
incoming lines. If this LED is on:
1. Check the incoming power.
2. Turn off power, wait 3 minutes, and check the fuses.
3. Check incoming power while the control is running under
load (it may be necessary to use an oscilloscope).
4. Change the Current Controller Board.
IOC (red)
This LED indicates dangerous current levels have oc-
curred in the output transistors. If this LED is on:
1. If control will run, check motor current with AC clamp on
ammeter while the motor is under load.
2. Disconnect motor and try to run.
3. Call POWERTEC service.
ENABLE (yellow)
This LED indicates that the control is in the RUN mode (the
RUN LED on the Speed Controller Board should also be on) and
there are no faults. If the motor is not running, a speed reference
signal may be needed. If this LED stays off, or goes off when a
RUN command is given to the control:
1. Check to see if a trip indicator is on.
2. Check for +24VDC at TB2 terminals 7, 5 and 4 (TB2
terminal 12 is common).
3. Make sure the ribbon cables are firmly seated.
4. Change the Current Controller Board.
5. Change the Speed Controller Board.
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