York OPTIVIEW Operation Manual page 132

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
TABLE 9 - SAFETY SHUTDOWN MESSAGES (CONT'D)
MESSAGE
VSD – HIGH PHASE A MOTOR
BASEPLATE TEMPERATURE
VSD – HIGH PHASE B MOTOR
BASEPLATE TEMPERATURE
VSD – HIGH PHASE C MOTOR
BASEPLATE TEMPERATURE
VSD – HIGH TOTAL DEMAND
DISTORTION
VSD – INVERTER PROGRAM
FAULT
VSD – INPUT CURRENT
OVERLOAD
VSD – INPUT DCCT OFFSET
LOCKOUT
VSD – LOGIC BOARD PLUG
VSD – MOTOR CURRENT
IMBALANCE
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The chiller has shutdown because the motor baseplate temperature exceeded the high
limit of 190°F (87.7°C). After the unit trips, the VSD fan(s) and water pump(s) shall
remain energized until the motor baseplate temperatures of all phases drop below the
fault-reset threshold of 165°F (73.8°C). In April of 2016 the shutdown control for the
fan(s) and pump(s) was changed. The control will now keep the fan(s) and pump(s)
running for 2 minutes after the fault occurred. This change occurred in software version
C.HYP.03.04.01, and C.HYP.04.04.01. When this happens, the unit's fan(s) and water
pump(s) shall be de-energized. When the condition clears, the chiller can be started
after the CLEAR FAULTS key is pressed.
See "VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE" message preceeding.
See "VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE" message preceeding.
This shutdown indicates the input current to the VSD is not sinusoidal. This shutdown will
occur if the TDD exceeds 25% continuously for 45 seconds. TDD is an acronym for Total
Demand Distortion, 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)". The displayed TDD is the total RMS value of all the harmonic
current supplied by the main power to the VSD divided by the chiller Full Load Amps, in
percent. The chiller can be started after the CLEAR FAULT key is pressed.
Inverter program fault – When some internal code exception of Inverter happens such
as divide-by-zero, out-of-range parameter, etc., the unit shall trip and the Raptyr logic
board shall indicate the inverter program fault and the error information including mod-
ule number and line number via the communications link. When the condition clears, the
chiller can be started after the CLEAR FAULTS key is pressed.
The highest of the three input RMS currents is monitored and compared against 105%
of the job input current at 90% line voltage. Because the job input current setting is at
nominal line voltage and this fault is based on power, and accounts for low-tolerance
line voltage, its threshold is 105%/90%=116.7%. If this value is exceeded continuously
for 10 seconds, this shutdown is generated. The 10 s timer is reset if three consecutive
RMS current values fall below the overload threshold. When the condition clears, the
chiller can be started after the CLEAR FAULTS key is pressed.
If three consecutive VSD – Phase A, B or C Input DCCT Offset cycling faults occur, this
safety shutdown is generated to require investigation and manual reset. When the con-
dition clears and VSD input modules determined acceptable, the chiller can be started
after the CLEAR FAULTS key is pressed.
A jumper is located in the rectifier and inverter DCCT plugs to feedback a digital signal
to indicate if the plugs are installed or not. If either plug is not installed, a low value is
read on the digital input causing the unit to trip, and this shutdown is generated. When
the condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
The three phase compressor motor current imbalance was greater than 30% continu-
ously for 45 seconds. The imbalance is not checked until the chiller has been running
for at least 45 seconds and the average of the three phases of motor current is greater
than 80% of the programmed 100% chiller Full Load Amps. The average is calculated
as: Iave = (Ia+Ib+Ic) / 3. The imbalance is calculated as:
(Ia-Iave) + (Ib-Iave) + (Ic-Iave) x 100
The Variable Speed Drive detects the unbalance condition and advise the OptiView
control center Microboard via serial communications. The chiller can be started after the
CLEAR faults key is pressed.
DESCRIPTION
2(Iave)
FORM 160.78-O2
ISSUE DATE: 5/22/2017
JOHNSON CONTROLS