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FORM 160.55-O1 (604)
This is generally indicative of a wiring problem be tween 
the OptiView Control Center and the VSD.  
VSD – SERIAL COMMUNICATIONS
This message is generated when communications be-
 tween the Adaptive Capacity Control (ACC) Board 
and the VSD Logic Board or between the OptiView 
Con trol Center Microboard and the VSD Logic Board, 
is disrupted. This is generally indicative of defective 
wir ing between J11 on the VSD Logic Board and J8 on 
the ACC Board. 
“HARMONIC FILTER – LOGIC BOARD OR 
COMMUNICATIONS”
 
This message is generated when communications be-
 tween the Harmonic Þ lter and the VSD Logic Board, is 
disrupted. If equipped with Flash Memory Card version 
C.MLM.02.03.xxx and later, the communications must 
be interrupted for 10 con tin u ous communications cy cles 
(20 seconds) before the shutdown will occur. 
HARMONIC FILTER – HIGH DC BUS 
VOLTAGE

The Harmonic Þ lter’s DC Link voltage is continuously 
monitored and if the level exceeds 860VDC, this shut-
 down is performed. 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 VSD’s 
DC link. If this shutdown occurs, it will be necessary 
to look at the level of 460VAC applied to the Har mon ic 
Filter. The speciÞ ed voltage range is 414 to 508. If the 
incoming voltage is in excess of 508, steps should be 
taken to reduce the level to within speciÞ ed limits. The 
cause of this message is typically high line voltage or a 
surge on the utility supply. 
HARMONIC FILTER – HIGH PHASE A 
CURRENT

The maximum instantaneous harmonic Þ lter current is 
monitored and compared to a preset limit. If this limit 
is exceeded, a shutdown is performed and this message 
is generated. The Filter current is monitored using two 
DCCT’s and these signals are processed by the Þ lter 
logic board. The preset limits are as follows: 
                351/292 HP    =     356 Amps
                503/419 HP    =     496 Amps
                790/658 HP    =     745 Amps
If the VSD automatically restarts after this shutdown and 
continues to operate properly with the Þ lter  op er at ing, 
it is likely the Þ lter tripped due to a sag or surge in the 
voltage feeding the VSD. If this message re oc curs, pre-
venting the chiller from starting, the VSD will re quire 
service.  
HARMONIC FILTER – HIGH PHASE B 
CURRENT

See “Harmonic Filter – High Phase A Current” mes-
 sage  above. 
HARMONIC FILTER – HIGH PHASE C 
CURRENT

See “Harmonic Filter – High Phase A Current” mes-
sage. 
HARMONIC FILTER – PHASE LOCKED 
LOOP

This shutdown indicates that a circuit called “Phase 
Locked Loop” on the Þ lter logic board has lost syn chro -
ni za tion with the incoming power line. This is usu al ly 
indicative of an open fuse in one of the Þ lter’s  in com ing 
power line. Filter power fuses 11FU, 12FU and 13FU 
should be checked. 
HARMONIC FILTER – PRECHARGE – 
LOW DC BUS VOLTAGE

During pre-charge, the Þ lter’s DC link must be equal 
to or greater than 50VDC (41VDC for 50 Hz) within 
1/10 second after the pre-charge relay is energized. If 
this condition is not met, a shutdown is performed and 
this message is generated. 
HARMONIC FILTER – LOW DC BUS 
VOLTAGE

The Harmonic Filter generates its own Þ lter DC link 
voltage by switching its IGBT’s. This DC level is ac-
 tu al ly higher than the level that one could obtain by sim-
 ply rectifying the input line voltage. Thus, the har mon ic 
Þ l ter actually performs a voltage “boost” function. This 
is necessary in order to permit current to ß ow into the 
power line from the Þ lter when the input line is at its 
peak level. This shutdown occurs when the Þ lter’s DC 
link voltage decreases to a level less than 60VDC be-
 low  the  Þ lter DC link voltage setpoint. This Setpoint is 
determined by the Þ lter 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 volt age 
plus 32 volts, not to exceed 760 volts and it varies with 
the input line-to-line voltage. If this shutdown oc curs 
occasionally, the likely cause is a severe sag in the input 
line voltage. 
HARMONIC FILTER – DC BUS VOLTAGE IM-
 BAL ANCE

The Þ lter DC link is Þ ltered by large, electrolytic ca-
 pac i tors,  rated  for  450VDC.  These  capacitors  are  wired 
OptiView Control Center