York OPTIVIEW - More VSD Safety Shutdowns

JOHNSON CONTROLS
131
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
FORM 160.78-O2
ISSUE DATE: 5/22/2017
2
MESSAGE DESCRIPTION
SURGE PROTECTION –
EXCESS SURGE
(Applies only if Surge Protection SHUTDOWN feature is Enabled)
The Surge Window Count surge events exceeded the Count Limit setpoint. The chiller
shuts down as soon as the count exceeds the limit. The chiller can be started after the
CLEAR FAULT key is pressed.
WATCHDOG – SOFTWARE
REBOOT
The Microboard’s software Watchdog initiated a Microprocessor reset because it de-
tected that a portion of the chiller operating Program was not being executed. The result
of this reset is a Safety shutdown and re-initialization of the Program. This is generally
indicative of a severe electrical power disturbance or impending Microboard Failure. The
chiller can be started after the COMPRESSOR switch is placed in the Stop-Reset (O)
position.
VSD – DC BUS LOCKOUT –
DO NOT CYCLE POWER
When the unit is stopped in a mode where no command exists to energize the DC bus,
the DC bus voltage is monitored and checked against a threshold level of 50V every
ve minutes. If the DC bus voltage is higher than the threshold value, this shutdown is
generated. When the condition clears and VSD input modules tested and determined
acceptable the chiller can be started after the CLEAR FAULTS key is pressed.
VSD – DC BUS
PRE-REGULATION LOCKOUT
If the unit fails to complete pre-regulation (due to VSD – DC BUS PRE-REGULATION
fault), it shall have to repeat pre-charge in order to attempt another pre-regulation.
The VSD logic board shall wait 10 seconds before clearing the dc-link voltage pre-
regulation fault and allowing another pre-charge to start. The unit’s fan(s) and water
pump(s) shall remain energized during this wait time. The VSD logic board shall allow
up to three consecutive pre-charge-related or pre-regulation-related faults (i.e. VSD-DC
BUS REGULATION or any of the faults applicable to VSD-PRECHARGE LOCKOUT)
to occur. After the third consecutive fault, this shutdown is generated. The VSD logic
board shall disable boost rectier’s IGBT gating signals (if the third fault occurred during
pre-regulation). When the condition clears, the chiller can be started after the CLEAR
FAULTS key is pressed.
VSD – GROUND FAULT
This message is generated when the sum of the 3 phases of instantaneous input cur-
rent values are greater than the shutdown value for a period of 1 second for the given
model of drive listed below. When the condition clears, the chiller can be started after
the CLEAR FAULTS key is pressed.
DRIVE MODEL GROUND CURRENT SHUTDOWN VALUE
490, 0490A 40 Amps
744 120 Amps
VSD – HIGH PHASE A INPUT
BASEPLATE TEMPERATURE
This shutdown occurred because the Input Baseplate Temperature exceeded the shut-
down value for the given model of drive listed below. After the unit trips, the VSD fan(s)
and water pump(s) shall remain energized until the temperatures of all three rectier’s
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 pumps shall be de-energized. When the condition clears, the chiller
can be started after the CLEAR FAULTS key is pressed.
DRIVE
MODEL
HIGH PHASE A INPUT BASEPLATE
TEMPERATURE SHUTDOWN VALUE
490, 0490A 190°F (87.8°C)
744 170°F (76.6°C)
VSD – HIGH PHASE B INPUT
BASEPLATE TEMPERATURE
See “VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE” message preceeding.
VSD – HIGH PHASE C INPUT
BASEPLATE TEMPERATURE
See “VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE” message preceeding.
TABLE 9 - SAFETY SHUTDOWN MESSAGES (CONT'D)