York YK-EP B Operation & Maintenance Manual page 183

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
Harmonic Filter – High Baseplate Temperature
(VSD part number 371-03789-xxx (503HP 60 Hz;
419HP 50 Hz)
The chiller has shutdown because the baseplate tem-
perature has increased to greater than 194°F. The chill-
er can be started after the fault condition clears, the
OVERTEMP RESET button on the Filter Logic Board
is pressed and the Operator presses the WARNING
RESET button.
VSD – Harmonic Filter-High Baseplate
Temperature
(575V/60 Hz applications)
If the baseplate temperature rises above the following
limits, this shutdown is performed:
424HP - 70.0°F, 174.2°C
608HP - 88.0°F, 190.4°C
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
Harmonic Filter – High Total Demand Distortion
This shutdown indicates the filter is not operating cor-
rectly and the input current to the VSD/Filter is not
sinusoidal. This shutdown will occur if the TDD ex-
ceeds 25% continuously for 45 seconds. TDD is an
acronym for Total Demand Distortion, a term defined
by the IEEE Std 519-2014 standard as the total root-
sum-square harmonic current distortion, in percent of
the maximum demand load current (15 or 30 min de-
mand). In the filter option supplied by YORK, the dis-
played 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. A standard
VSD, less the optional filter typically has an input cur-
rent TDD level on the order of 28-30%. The chiller can
be started after the Operator presses the WARNING
RESET button.
VSD – Low Frequency Detected
After a 20 second bypass after entering System Run, if
the VSD frequency decreases to below 1 Hz less than
the minimum allowed frequency for 25 continuous
seconds, this shutdown is initiated. The minimum al-
lowed frequency for the VSD is 25 Hz for 50 Hz units;
30 Hz for 60 Hz units. The Operator must press the
WARNING RESET button to reset the fault.
3
183