Harmonic Filter - Logic Board Power Supply; Harmonic Filter - Low Dc Bus Voltage; Harmonic Filter - Phase Locked Loop; Harmonic Filter - Precharge - Low Dc Bus Voltage - York VSD 270 Operation Manual

FORM 160.00-O4
ISSUE DATE: 12/19/2017
TABLE 4 - CYCLING SHUTDOWN MESSAGE (CONT'D)
MESSAGE
Harmonic Filter - Logic Board
Power Supply
FLTR POWER SUPPLY FLT
Harmonic Filter - Low DC Bus
Voltage
FLTR LOW BUS VOLTAGE FLT
Harmonic Filter - Phase
Locked Loop
FLTR PHASE LOCK LOOP FLT
Harmonic Filter - Precharge -
Low DC Bus Voltage
FLTR PCHARGE LOW BUS V FLT

Harmonic Filter - Run Signal

FLTR RUN RELAY FLT
30
This shutdown indicates that one of the low voltage power supplies on the harmon-
ic filter logic board have dropped below their permissible operating voltage range.
The harmonic filter logic board receives its power from the OSCD logic board. The
power supplies for the OSCD logic board are in turn derived from the secondary of
the 120 to 24 VAC transformer.
The harmonic filter dynamically generates its own filter DC link voltage by the inter-
action of the harmonic filter inductor and switching its transistors. This DC level is
actually higher than the level obtained by simply rectifying the input line voltage.
The DC link voltage is always higher on
the harmonic filter power unit then on the
OSCD VSD power unit.
Thus the harmonic filter actually performs a voltage "boost" function. This is neces-
sary in order to permit current to flow into the AC line from the harmonic filter when
the AC line is at its peak level. This particular shutdown and its accompanying mes-
sage are generated when the harmonic filter's DC link voltage drops to a level less
than 80 VDC (for 380 through 460 VAC input voltage) and 110 VDC (for 575 VAC
input voltage) below the harmonic filter DC link voltage setpoint.
This shutdown indicates that a circuit called a "phase locked loop" on the harmonic
filter logic board has lost synchronization with the incoming power line for a period
of time.
Two minimum voltage thresholds must be met in order to complete the precharge
cycle. The first occurs 1/10th of a second after pre-charge is initiated and the other
occurs 5 seconds after precharge is initiated. See table below for specific values.
NOMINAL INPUT
VOLTAGE VALUE
380-460 VAC
575 VAC
When a digital run command is received at the harmonic filter logic board from the
OSCD logic board, a 1/10 second timer is started. A redundant run command must
also occur on the communication link from the OSCD logic board before the timer
expires or the OSCD will be shut down.
DESCRIPTION
1ST MINIMUM VOLT-
AGE VALUE VOLTAGE VALUE
41 VDC
60 VDC
2ND MINIMUM
425 VDC
630 VDC
JOHNSON CONTROLS