Johnson Controls YORK YK MaxE Operation Manual page 154

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If the chiller will not restart, but keeps tripping on this
same shutdown, an output pole problem is the most
likely cause. The VSD would require service under
these conditions.
"VSD – HIgH PHASE B
InSTAnTAnEOUS CURREnT"
See "High Phase A Instantaneous Current" message
above.
"VSD – HIgH PHASE C
InSTAnTAnEOUS CURREnT"
See "High Phase A Instantaneous Current" message
above.
"VSD – PHASE A gATE DRIVER"
A second level of current protection exists on the VSD
driver boards themselves. The collector-to-emitter sat-
uration voltage of each IGBT is checked continuously
while the device is gated on. If the voltage across the
IGBT is greater than a set threshold, the IGBT is gated
off and a shutdown pulse is sent to the VSD logic board
shutting down the entire VSD system. A gate driver fault
can be initiated when the VSD is not running.
"VSD – PHASE B gATE DRIVER"
See "Phase A Gate Driver" message above.
"VSD – PHASE C gATE DRIVER"
See "Phase A Gate Driver" message above.
"VSD - SIngLE PHASE InPUT POWER"
This shutdown is generated by the SCR trigger control
and relayed to the VSD logic board to initiate a system
shutdown. The SCR Trigger control uses circuitry to
detect the loss of any one of the three input phases. The
Trigger will detect the loss of a phase within one half line
cycle of the phase loss. This message is also displayed
every time power to the VSD is removed or if the input
power dips to a very low level.
"VSD – HIgH DC BUS VOLTAgE"
The VSD's DC link voltage is continuously monitored
and if the level exceeds 745VDC, a Bus Over-Voltage
shutdown is initiated. If this shutdown occurs, it will be
necessary to look at the level of the 460VAC applied to
the drive. The specified voltage range is 414 to 508VAC.
If the incoming voltage is in excess of 508VAC, steps
should be taken to reduce the voltage to within the
specified limits.
"VSD – LOgIC BOARD POWER SUPPLY"
This shutdown is generated by the VSD logic board and
it indicates that the low voltage power supplies for the
logic boards have dropped below their allowable oper-
154
ating limits. The power supplies for the logic boards
are derived from the secondary of the 120 to 24VAC
transformer, which in turn, is derived from the 480 to
120VAC control power transformer. This message usu-
ally means the power to the VSD has been removed.
"VSD – LOW DC BUS VOLTAgE'
If the DC link drops below 500VDC (or 414VDC for 50
Hz applications), the drive will initiate a system shut-
down. A common cause for this shutdown is a severe
sag in the incoming power to the drive. Monitor the
incoming three-phase AC line for severe sags and also
monitor the DC link with a voltmeter.
"VSD-LOW DC BUS VOLTAgE"
(575V/60Hz applications)
(Software version C.OPT.01.15.xxx (or later))
If the DC Link Voltage falls below 600VDC while run-
ning, this shutdown is performed.
"VSD – DC BUS VOLTAgE IMBALAnCE"
The DC link is filtered by many large electrolytic ca-
pacitors, rated for 450VDC. These capacitors are wired
in series to achieve 900VDC capability for the DC link.
It is important that the voltage be shared equally from the
junction of the center, or series capacitor connection, to
the negative bus and the positive bus. This center point
should be approximately ½ of the total DC link voltage.
Most actual bus voltage imbalance conditions are caused
by a shorted capacitor or a leaky or shorted IGBT tran-
sistor in an output phase bank assembly. This usually
indicates the VSD requires service.
"VSD-DC BUS VOLTAgE IMBALAnCE"
(575V/60Hz applications)
(Software version C.OPT.01.15.xxx (or later))
If the Half DC Link Voltage does not remain within
±106VDC of the DC Link Voltage divided by 2 while
running, this shutdown is performed.
"VSD – PRECHARgE – DC BUS VOLTAgE IM-
BALAnCE"
This message indicates the same as the "VSD-DC Bus
Voltage imbalance" message above, except the condition
occurred during the Pre-lube period.
"VSD—PRECHARgE-DC BUS VOLTAgE IM-
BALAnCE"
(575V/60Hz applications)
(Software version C.OPT.01.15.xxx (or later))
If the Half DC Link voltage does not remain within ±
106VDC of the DC Link Voltage divided by 2 during the
pre-charge interval, this shutdown is performed.
FORM 160.54-O1
JOHNSON CONTROLS