JOHNSON CONTROLS
99
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
MESSAGE DESCRIPTION
VSD – PHASE B MOTOR GATE
DRIVER
See “VSD – PHASE A MOTOR GATE DRIVER” message preceding.
VSD – PHASE C MOTOR GATE
DRIVER
See “VSD – PHASE A MOTOR GATE DRIVER” message preceding.
VSD – PRECHARGE – LOW DC
BUS VOLTAGE 1
During Pre-charge, the DC Bus voltage must exceed the minimum threshold which is
determined by Line Voltage Setpoint (see the table below) within 4 seconds after the
pre-charge signal has been commanded. If this condition is not met, this shutdown is
generated. The VSD logic board shall wait 10 seconds before clearing the fault and
allowing another pre-charge to start. The VFD’s fan(s) and water pump(s) shall remain
energized during this time. The VSD logic board shall allow up to three consecutive
pre-charge-related faults to occur. After the third consecutive pre-charge-related fault,
Safety Shutdown message “VSD – PRECHARGE LOCKOUT” is generated.
LINE VOLTAGE MINIMUM THRESHOLD (VOLTS)
380/415 41
460 50
VSD – PRECHARGE – LOW DC
BUS VOLTAGE 2
During Pre-charge, the DC Bus voltage must exceed the minimum threshold which is
determined by Line Voltage Setpoint (see the table below) within 12 seconds after the
pre-charge signal has been commanded. If this condition is not met, this shutdown is
generated. The VSD logic board shall wait 10 seconds before clearing the fault and
allowing another pre-charge to start. The VFD’s fan(s) and water pump(s) shall remain
energized during this time. The VSD logic board shall allow up to three consecutive
pre-charge-related faults to occur. After the third consecutive pre-charge-related fault,
Safety Shutdown message “VSD – PRECHARGE LOCKOUT” is generated.
LINE VOLTAGE MINIMUM THRESHOLD (VOLTS)
380/415 414
460 500
VSD – RUN SIGNAL
Redundant RUN signals are generated by the control center; one via TB6-24 and the
second via the Serial Communications link. Upon receipt of either of the two RUN com-
mands by the VSD, a 5 second timer shall commence timing. If the run signal on TB6-24
is not received by the VSD Logic Board within 5 seconds, a shutdown is performed and
this message is displayed. This is generally indicative of a wiring problem between the
control center and the VSD.
VSD – SERIAL RECEIVE
This shutdown is generated when the VSD logic board has not received a valid commu-
nications packet from the control center for 10 consecutive seconds.
VSD SHUTDOWN –
REQUESTING FAULT DATA
The VSD has shutdown the chiller and the control center has not yet received the cause
of the fault from the VSD, via the serial communications link. The VSD shuts down the
chiller by opening the Motor Controller VSD Stop Contacts. The control center then
sends a request for the cause of the fault to the VSD over the serial link. Since serial
communications are initiated every 2 seconds, this message is typically displayed for a
few seconds and then replaced with one of the other VSD fault messages.
VSD – SINGLE PHASE INPUT
POWER
The VSD monitors the input voltage of all three phases. If the input voltage of any one
phase drops below the threshold value for the given input voltage range below, then this
shutdown will occur.
INPUT VOLTAGE
RANGE
INPUT VOLTAGE SINGLE PHASE
SHUTDOWN VALUE
380/415 264 Volts
460 295 Volts
VSD – STOP (FAULT)
CONTACTS OPEN
Refer to “VSD Shutdown – Requesting Fault Data” message above. If the control
center’s does not receive the cause of the Fault over the Serial Link within 20 seconds,
it is assumed it is not forthcoming and that message is replaced with “VSD – STOP
CONTACTS OPEN” message.
TABLE 11 - CYCLING SHUTDOWN MESSAGES (CONT'D)
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