York MILLENIUM 351-46, Operating Instructions Manual, Page: 20 / 24

JOHNSON CONTROLS
20
FORM 160.00-O1 (1020)
pressing the OPTIONS key and noting the %Job
FLA value displayed. A zero displayed value for this
parameter (and all other VSD parameters) indicates
a serial communications link or EPROM problem.
• If the IEEE-519 Filter option is included, make sure
the ‘519’ Logic board is not in continuous reset.
This will be evidenced by the LEDs on the filter logic
board alternately blinking. To rule out the ‘519’ filter
as the cause of initialization failure, you can discon-
nect the filter by switching the filter logic board’s
SW1 switch to the OFF position, and removing the
16 wire ribbon cable between the ‘519’ logic and
VSD logic boards.
Message:
FLTR HEATSINK OVERTEMP FLT
The ‘519’ filter power assembly has one heatsink
thermistor on the 351 & 503 HP units, and two heatsink
thermistors on the 790 HP units. If the temperature on
any heatsink exceeds 167 °F, the unit will shut down,
and require a manual reset by pressing the “Overtemp
Reset” pushbutton located on the Filter Logic board.
This message is usually an indication that the level of
coolant in the closed loop system on the back of the
VSD is low.
Message:
FLTR BUS OVER-VOLTAGE FLT
The harmonic filter’s DC link voltage is continuously
monitored and if the level exceeds a level of 860 VDC
a Filter Bus Over-Voltage shutdown is initiated. Keep
in mind that the harmonic filter has its own DC bus as
part of the filter power assembly, and this DC Link is
not connected in any way with the drive’s DC Link. If
this shutdown occurs, it will be necessary to look at the
level of the 460 VAC applied to the drive. The specified
voltage range is 414 to 508. If the incoming voltage is
in excess of 508, steps should be taken to reduce the
voltage within the specified limits. The cause of this
message will typically be high line voltage, or a surge
on the utility supply.
Message:
FLTR LOW BUS VOLTAGE FLT
The harmonic filter dynamically generates its own filter
DC link voltage by switching its IGBT’s. This DC level
is actually higher than the level that one could obtain
by simply rectifying the input line voltage. Thus the har-
monic filter actually performs a voltage “boost” function.
This is necessary in order to permit current to flow into
the power line from the filter when the input line is at its
peak level. This particular shutdown and its accompany-
ing message is generated if the filter’s DC link voltage
drops to a level less than 60 VDC below the filter DC
link voltage setpoint. The filter DC link voltage setpoint
is determined by the filter logic board via the sensing of
the three phase input line-to-line voltage. This setpoint
is set to the peak of the sensed input line- to-line voltage
plus 32 volts, not to exceed 760 volts and varies with
the input line-to-line voltage. If this shutdown occurs
occasionally, the likely cause is a severe sag in the
input line voltage. A power monitor should be installed
to determine if a power problem exists.
Message:
FLTR PHASE A (B,C) OVERCURRENT
The maximum instantaneous harmonic filter current is
monitored and compared against a preset limit. If this
limit is exceeded, the unit is shut down and this mes-
sage is generated. The filter current is monitored using
two DCCTs and these signals are processed by the filter
logic board. The preset limits are as follows:
351/292 HP = 378 Amps
503/419 HP = 523 Amps
790/658 HP = 782 Amps
1100/900 HP = 1225 Amps
If you experience this shutdown and the VSD auto-
restarts and continues to run properly with the filter
operating, it is likely the filter tripped on Overcurrent due
to a sag or surge in the voltage feeding the chiller. If
this message re-occurs, preventing the unit from being
restarted, the VSD will require service.
Message:
FLTR PHASE LOCK LOOP FLT
This shutdown indicates that a circuit called a “phase
locked loop” on the filter logic board has lost synchro -
nization with the incoming power line for a period of
time. This is normally an indication that one of the filter’s
incoming power fuses is blown. Check filter power fuses
11FU, 12FU and 13FU if this shutdown occurs.
Message:
FLTR POWER SUPPLY FLT
This shutdown indicates that the low voltage power
supplies on the filter logic board have dropped below
their permissible operating voltage range. The filter logic
board receives its power from the VSD logic board via
the ribbon cable which connects the two boards.
Message:
FLTR BUS V IMBALANCE FLT
The filter DC link is filtered by large, electrolytic capaci -
tors which are rated for 450 VDC. These capacitors
are wired in series to achieve a 900 VDC 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 to the positive bus.
This center point should be approximately ½ of the total
DC link voltage.