HT4001 Instruction Manual
7-23
MAINTENANCE
4-00
Return analog PCB3 connectors PL3.6, PL3.9, PL3.5 and PL3.7 to their original positions.
6.
If a chopper does not 360 VDC, check to see if LED1 logic power light is illuminated. If LED1
is extinguished, check if 120V is going to JP6. If there is no 120V at JP6, check wiring back to power
distribution board. Repair or replace defective component(s), if necessary. Also check to see if
LED3 is turning green when enabled (normal condition). If LED1 is illuminated and LED3 is red when
enabled (fault condition), then make sure that JP9 is seated properly.
7.
If a chopper still does not 360 VDC after completing these instructions through step 6, there
may be a problem with the control signal or the chopper module. The chopper drive signal comes
through the analog board PCB3 as an analog level from 0 to +6.2 VDC, which varies the duty cycle
and subsequent output current of the chopper. These analog signals are on PCB3 pins 5&6 PL3.9
for CH1, pins 5&6 PL3.5 for CH2, pins 5&6 PL3.6 for CH3, and pins 5&6 PL3.7 for CH4.
To check choppers in non-transferred mode:
•
Ensure that high frequency is still disabled (see step 1).
•
On analog board PCB3, disconnect PL3.9 from REC9 (to test CH1), or disconnect PL3.5
from REC5 (to test CH2), or disconnect PL3.6 (to test CH3), or disconnect PL3.7 (to test
CH4).
•
Place voltmeter across the output of the chopper in test and press the START command.
•
If the voltmeter reads +360 VDC, then there is a problem with either control board PCB2 or
analog board PCB3.
•
If the voltmeter reads 0 volts, then replace the chopper module.
Figure 7-3 Chopper Module - Front View
JP6
LED3
JP9
LED1
Bridge (–)
Bridge (+)
(-) TORCH
(+) WORK
PL3.9
PL3.5
PL3.6
PL3.7
REC9
REC5
REC6
REC7
Figure 7-3A Analog PCB3
3
φ
Input
Содержание HT4001
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