PowerTec 1000 User Manual

Page
40
Model
1000
Installation and Operation Manual
6/1/2001 © copyright 1997 by Powertec
D
IODE
B
RIDGE
T
EST
Equipment needed: A
D
igital
M
ulti-
M
eter (
DMM
)with a diode scale is preferred. You should have a RED lead
in the positive (+) input and a BLACK lead in the negative (-) input.
Preparation: Different meters give different readings on diode tests. KNOW YOUR METER !! Some
meters read backwards due to battery polarity. Test YOUR meter on a known good diode
bridge before performing tests so that you know how your meter will act.
Precautions: If the diode bridge is to be tested in circuit, make sure power has been off long enough for
the capacitor banks to completely discharge.
Procedure: The procedure is the same for in circuit or out of circuit testing. If a component tests bad
in circuit, it must be tested again after it is removed because of the possibility of alternate
paths when the component is in circuit.
1.
Set the DMM on the diode scale.
2.
Place the RED (positive) lead on the “-“ or “N” terminal of the diode bridge. Place the
BLACK (negative) lead on each of the AC terminals in turn. In each case you should
read about 0.300 to 0.700 on a digital meter. If you see a short or an open circuit,
disconnect the wires from the diode bridge terminals and re-test.
3.
Repeat the above step with the BLACK lead on the “+” or “P” terminal of the diode
bridge, placing the RED lead on each of the AC terminals.
4.
Place the RED lead on the “+” or “P” terminal and the BLACK lead on the “-“ or “N”
terminal. It should read an open circuit.
T
RANSISTOR
L
EAKAGE
T
EST
Equipment needed: A
D
igital
M
ulti-
M
eter (
DMM
) is preferred. You should have a RED lead in the positive (+)
input and a BLACK lead in the negative (-) input.
Preparation: Set the meter on the 1000VDC scale. Be sure the leads are insulated for this voltage.
Refer to page 36 for the drive power schematic and semi-conductor diagrams.
Precautions:
This test is an in-circuit test with power on
. It should be performed by personnel who
have been trained to work around high voltage.
Procedure: Turn the drive power off and disconnect motor leads T1, T2, and T3.
Turn the power on and wait for the bus to charge (a green BUS LED). If the bus will not
charge, turn power off and go to TRANSISTOR MODULE STATIC TEST.
Measure the BUS voltage (POSITIVE BUS to NEGATIVE BUS) before beginning.
Place the Red lead of the meter on the POSITIVE BUS. Place the BLACK lead, in turn, on
T1, then T2, then T3. In each case, notice the voltage reading.
•
If any voltage reading is 0 VDC, there may be a bad transistor. Turn off
power, disconnect the transistor module connected to the T lead with the
bad reading, and perform the TRANSISTOR MODULE STATIC TEST.
•
If any voltage reading is the same as the BUS VOLTAGE, it may indicate a
problem in the opposing transistor in that T lead leg or an unexpected
alternate path in the circuit.
1. Repeat the above test with the BLACK lead on the NEGATIVE BUS and touching the
RED lead, in turn, to T1, T2, and T3. Check the transistor block connected to any T
lead reading 0 VDC or BUS voltage.
•
If any voltage reading is 0 VDC, there may be a bad transistor. Turn off
power, disconnect the transistor module connected to the T lead with the
bad reading, and perform the TRANSISTOR MODULE STATIC TEST.
•
If any voltage reading is the same as the BUS VOLTAGE, it may indicate a
problem in the opposing transistor in that T lead leg or an unexpected
alternate path in the circuit.

PowerTec 1000 Specifications

General

Brand	PowerTec
Model	1000
Category	Controller
Language	English