YK CENTRIFUGAL LIQUID CHILLER OptiView ... - Johnson Controls

44 160-54-OI-GB0
VSD – HIGH PHASE X INVERTER HEATSINK TEMPERATURE
This shutdown will occur if the heatsink temperature on
phase A, B or C (designated as X in the message)
exceeds 70 °C (158 °F) on any of the output pole
assemblies. This shutdown will seldom occur. In most
cases where the coolant temperature has risen
abnormally, the VSD will shut down on 'Ambient
Temperature' at 60 °C (140 °F) before the heatsinks can
reach 70 °C (158 °F).
If this message is displayed, make sure there is
adequate coolant level, ascertain the pump is operating
when the unit is running, and check the strainer in the
primary of the heat exchanger for blockages and silt.
The unit can be started after the fault condition clears,
the 'RESET' button on the VSD logic board is pressed
and the 'COMPRESSOR' switch is cycled to the
'STOP-RESET' (O) position.
VSD – HIGH CONVERTER HEATSINK TEMPERATURE
See 'HIGH PHASE X INVERTER HEATSINK
TEMPERATURE' message.
VSD – PRECHARGE LOCKOUT
If the VSD fails to make Pre-charge, the Pre-charge
relay shall drop out for 10 seconds during which time the
VSD’s fans and water pumps shall remain energised in
order to permit the Pre-charge resistors to cool.
Following this 10 second cool down period, Pre-charge
shall again be initiated. The VSD shall attempt to make
Pre-charge 3 consecutive times. If the VSD fails to make
Pre-charge on 3 consecutive tries, the unit will shut
down, lockout and display this message.
The unit can be restarted after the 'COMPRESSOR'
switch is cycled to the 'STOP-RESET' (O) position.
HARMONIC FILTER – HIGH HEATSINK TEMPERATURE
The harmonic filter power assembly has one heatsink
thermistor on the 351 and 503 HP units, and two
heatsink thermistors on the 790 HP units. If the
temperature on any heatsink exceeds 75 °C (167 °F),
the unit will shut down.
This message is usually an indication of a low coolant
level in the VSD cooling loop. The unit can be started
after the fault condition clears, the 'OVERTEMP
RESET' button on the filter logic board is pressed and
the 'COMPRESSOR' switch is cycled to the
'STOP-RESET' (O) position.
HARMONIC FILTER – HIGH TOTAL DEMAND DISTORTION
This shutdown indicates the filter is not operating
correctly and the input current to the VSD filter is not
sinusoidal. This shutdown will occur if the total demand
distortion (TDD) exceeds 25% for 45 seconds.
TDD is the 'total root-sum-square harmonic current
distortion, in percent of the maximum demand load
current (15 or 30 min demand)'.
In the York supplied filter option the displayed TDD is the
total RMS value of all the harmonic current supplied by
the main power to the VSD divided by the unit Full Load
Amps, in percent. A standard VSD, less the optional
filter typically has an input current TDD level on the order
of 28-30%.
The unit can be started after the 'COMPRESSOR'
switch is cycled to the 'STOP-RESET' (O) position.