Johnson Controls YORK YMC2 Operation And Maintenance Manual

Table 99: Cycling shutdown messages
Message Description
VSD – HIGH INTERNAL
AMBIENT TEMPERATURE
The variable speed drive contains two temperature sensors, which
monitor the unit’s internal ambient temperature. This shutdown is
generated when the higher of the two ambient temperatures exceeds
a high limit of 158°F (70°C). The unit’s fan(s) and water pump(s) remain
energized until the internal temperature drops below 148°F (64°C),
after which they shall be de-energized and the fault can be cleared.
Some potential causes for this shutdown are internal VSD fan failure,
VSD coolant pump failure, entering condenser water temperature
higher than design, condenser water flow lower than required, fouled
VSD heat exchanger, or restriction of condenser water to the VSD.
VSD – HIGH PHASE A
INPUT CURRENT
If the A phase input current exceeds the value for the given model of
drive, then a cycling shutdown will occur.
Drive model Input current fault value
0490 886 Amps
0490A 942 Amps
0612A 1418 Amps
0730A 1418 Amps
0774 1446 Amps
1278A (380-415 VAC) 3304 Amps
1278A (460 VAC) 2796 Amps
If three high input current cycling shutdown faults occur on any phase
within 90 minutes, the third fault in the 90 minute period will cause
a Safety Shutdown. If the safety shutdown occurs, the chiller can be
restarted after the clear faults button is pressed.
VSD – HIGH PHASE B
INPUT CURRENT
See VSD – HIGH PHASE A INPUT CURRENT.
VSD – HIGH PHASE C
INPUT CURRENT
See VSD – HIGH PHASE A INPUT CURRENT.
VSD – HIGH PHASE A
MOTOR CURRENT
If the A phase motor current exceeds the value for the given model of
drive, then a cycling shutdown will occur.
Drive model Motor current fault value
0490, 0490A 776 Amps
0612A 1094 Amps
0730A, 0774 1317 Amps
1278A 2164 Amps
If three high motor current cycling shutdown faults occur on any phase
within 90 minutes, the third fault in the 90 minute period will cause
a Safety Shutdown. If the safety shutdown occurs, the chiller can be
restarted after the clear faults button is pressed.
VSD – HIGH PHASE B
MOTOR CURRENT
See VSD – HIGH PHASE A MOTOR CURRENT.
VSD – HIGH PHASE C
MOTOR CURRENT
See VSD – HIGH PHASE A MOTOR CURRENT.
YMC
2
Mod B with OptiView Control Center
108

Johnson Controls YORK YMC2 Specifications

General

Brand	Johnson Controls
Model	YORK YMC2
Category	Chiller
Language	English