Yaskawa DSD 406 - Manual (Page 63)

4 Maintenance
59 Power Conversion Unit Diagnostics
3/21/96
❏ Press the ENTER key to actually start the PCU diagnostics. While the PCU
is performing the diagnostics test, the SCDU displays:
The PCU will not begin the diagnostic routines if a SEVERE PCU FAULT
exists. The PCU will declare a SEVERE FAULT under several conditions
including an IST fault, power supply failure, line sync loss, low line, or DCU
failure. If a SEVERE FAULT exists when the PCU starts the diagnostic tests,
the SCDU displays:
➊
Severe faults can only be cleared by pressing the RESET button on
the Main CPU Control PCB or by cycling power to the drive.
❷
If the display stays on 'tESt' and the contactor doesn't pick up, there is a
fault in the motor field connections.
❸
There are 4 different kinds of displays possible on the SCDU after the
PCU diagnostic routines complete. If all tests indicate that there are no
failed power components (SCRs and fuses), the SCDU displays:
GREEN
DATA
test
GREEN
DATA
sflt
GREEN
DATA
pass