Yaskawa Portable Control Display Unit - Manual (Page 58)

6 TEST MENU
52 Diagnostics
01/22/96
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The PCDU displays the following if
it detects one or more open SCRs on
the forward power bridge:
The “1”, “2”, “3”, “4”, “5”, and “6”
designators annunciate which of the SCRs
is open. It is also possible that the
indication of a faulty SCR is due to its gate
lead being disconnected.
A similar display exists for the reverse
power bridge, with “Rev” appearing in
place of “Fwd” in the message.
• Turn the power off and replace the
open SCR(s) before continuing.
When the Power Conversion Unit
Diagnostics detects a faulted component,
the drive will continue to operate, but the
Power Conversion Unit generated fault will
not allow it to turn a motor. The last
display of the Power Conversion Unit
Diagnostic routine if a fault was detected
will be:
• Press the ESC key. The Digital
Control Unit (DCU) will continue to
operate normally, although the
Power Conversion Unit (PCU) will
not. The PCDU will display the top
level screen for this function:
PCU Diagnostics
(Press ENT) T998
Failure Detected
(press ESC)
Open Fwd 123456
(press ESC)