York MILLENIUM 351-46, Operating Instructions Manual, Page: 21 / 24

FORM 160.00-O1 (1020)
JOHNSON CONTROLS
21
Message:
FLTR PCHARGE LOW BUS V FLT
During pre-charge the filter’s DC link must be equal to
or greater than 50 VDC (41 VDC for 50 HZ) 1/10 sec-
ond after the filter pre-charge relay is energized. The
unit is shut down and this message is generated if this
condition is not met. If this shutdown occurs, check the
filter pre-charge relay, filter pre-charge resistors, and
the wiring between the filter logic board and the filter
pre-charge relay.
Message:
FLTR PCHARGE HI BUS V FLT
During pre-charge the filter’s DC Link must reach at least
525 VDC (425 VDC for 50 HZ) 5 seconds after the filter
pre-charge relay is energized. The unit is shut down and
this message is generated if this condition is not met. If
this shutdown occurs, check the filter pre-charge relay,
filter pre-charge resistors, and the wiring between the filter
logic board and the filter pre-charge relay.
Message:
FLTR OVERLOAD FLT
The three phases of RMS filter current are monitored
and if the level of any one of the three phases continu-
ously exceeds a given threshold for seven seconds, unit
shutdown is initiated and this message is displayed. The
maximum permissible continuous RMS current ratings
for the harmonic filters are as follows:
351/292 HP = 128 Amps
503/419 HP = 176 Amps
790/658 HP = 277 Amps
1100/900 HP = 385 Amps
Message:
FLTR HIGH TDD FLT
This shutdown indicates that the filter is not operating
correctly and the input current to the VSD/filter system
is not sinusoidal. This shutdown will occur if the TDD
exceeds 25% continuously for 45 seconds. TDD is an
acronym for Total Demand D istortion, a term defined by
the IEEE Std 519-1992 standard as “the total root - sum
- square harmonic current distortion, in percent of the
maximum demand load current (15 or 30 min demand)”.
In the filter option supplied by York, the displayed TDD is
the total RMS value of all the harmonic current supplied
by the power mains to the VSD system divided by the job
FLA of the VSD, in percent. The harmonic filter option
was designed to provide an input current TDD level of
8% or less for the VSD system. A standard VSD less the
optional filter typically has an input current TDD level on
the order of 28 - 30%.
Message:
WARNING - FILTER DATA LOSS
This message is displayed if the communications link
between the VSD logic board and the filter logic board,
or the communications link between the filter logic board
and the ACC board is interrupted. This message can
also occur as a background message when the chiller is
running. When this message is displayed all filter related
parameters are replaced with X’s. If communications is
re-established, the message will disappear, and normal
values will again be displayed.
Message:
FILTER DCCT 1 (OR 2) ERROR
During initialization, with no current flowing through the
DCCT’s, the DCCT output voltages are measured and
compared with a preset limit via the filter logic board.
If the measured values exceed the preset limits, the
DCCT’s are presumed to be bad and this shutdown will
be generated.
Message:
FLTR RUN RELAY FLT
When a digital run command is received at the filter logic
board from the VSD logic board via the 16 position ribbon
cable, a 1/10 second timer is begun. A redundant run
command must also occur on the serial data link from
the VSD logic board via the ribbon cable before the timer
expires or the unit will be shut down and this message
will be displayed.
THE FOLLOWING MESSAGES PERTAIN TO
ORIGINAL AND “STYLE A” UNITS ONLY:
Message:
FLTR CO-PROCESSOR FLT
This message indicates a clock timing problem has
occurred on the filter logic board.
Message:
FLTR SW-BACKGRND FLT
(or,
FLTR SW-PRECHARGE LOOP FLT
on early units)
This message means the software did not complete the
program loop in the allotted time. This is a watchdog
timer function on the Filter Logic board.
Message:
FLTR +15 V POWER SUPPLY FLT
This message indicates a failure of a low voltage DC
regulator on the filter logic board.
Message:
FLTR –5 V POWER SUPPLY FLT
This message indicates a failure of a low voltage DC
regulator on the filter logic board.
Message:
FLTR –15 V POWER SUPPLY FLT
This message indicates a failure of a low voltage DC
regulator on the filter logic board.
Message:
FLTR THERMISTOR SUPPLY FLT
This message indicates a failure of a low voltage DC
regulator on the filter logic board.