JOHNSON CONTROLS
122
FORM 160.78-O2
ISSUE DATE: 5/22/2017
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
MESSAGE DESCRIPTION
VSD – HIGH PHASE A INPUT
CURRENT
Phase A input current exceeded the value listed for a given model of drive. The three
input currents are monitored with Hall-effect current sensors, and their instantaneous
values compared to the limit. A current in excess of the limit causes this cycling shut-
down. If three high input current cycling shutdown faults occur on any phase within 90
minutes, the third fault in the 90 minute period causes a Safety Shutdown. If the safety
shutdown occurs, the chiller can be restarted after the CLEAR FAULTS key is pressed.
DRIVE AMP RATING INSTANTANEOUS CURRENT VALUE
490 886
0490A 942
744 1446
VSD – HIGH PHASE B INPUT
CURRENT
See “VSD – HIGH PHASE A INPUT CURRENT” message preceeding.
VSD – HIGH PHASE C INPUT
CURRENT
See “VSD – HIGH PHASE A INPUT CURRENT” message preceeding.
VSD – HIGH PHASE A MOTOR
CURRENT
Phase A motor current exceeded the value listed for a given model of drive. The three
motor currents are monitored with Hall-effect current sensors, and their instantaneous
values compared to the limit. A current in excess of the limit causes this cycling shut-
down. If three high motor current cycling shutdown faults occur on any phase within 90
minutes, the third fault in the 90 minute period causes a Safety Shutdown. If the safety
shutdown occurs, the chiller can be restarted after the CLEAR FAULTS key is pressed.
DRIVE MODEL MOTOR CURRENT FAULT VALUE
490, 0490A 776 Amps
744 1086 Amps
VSD – HIGH PHASE B MOTOR
CURRENT
See “VSD – HIGH PHASE A MOTOR CURRENT” message preceeding.
VSD – HIGH PHASE C MOTOR
CURRENT
See “VSD – HIGH PHASE A MOTOR CURRENT” message preceeding.
VSD INITIALIZATION FAILED
Upon application of power, all boards go through the initialization process. At this
time, memory locations are cleared, program jumper positions are checked and serial
communications links are established. There are several causes for an unsuccessful
initialization as follows:
• The control center and the VSD must be energized at the same time. The practice of
pulling the fuse in the control center to remove power from the control center will cre-
ate a problem. Power-up must be accomplished by closing the main disconnect on
the VSD cabinet with all fuses in place. A power interruption to the VSD Logic board
will also generate this message.
• The Eproms must be of the correct version for each VSD board and they must be
installed correctly. The eproms are created as a set, and cannot be interchanged
between earlier and later versions.
• Serial data communications must be established. Refer to VSD – Serial Commu-
nications fault. If communications between the VSD Boards, and control center
Microboard does not take place during initialization, this message will be generated.
The Serial communications can be veried by selecting the VSD DETAILS screen
from the MOTOR screen and observing the Full Load amps value. A zero displayed
for this and other VSD parameters, indicates a serial communications link problem.
VSD – LOGIC BOARD POWER
SUPPLY
This shutdown is generated by the VSD logic board and it indicates that the low voltage
power supplies for the logic boards have dropped below their allowable operating limits.
The power supplies for the logic boards are derived from the secondary of the 120 to
24VAC transformer, which in turn, is derived from the 480 to 120VAC control power
transformer. This message usually means the power to the VSD has been removed.
TABLE 8 - CYCLING SHUTDOWN MESSAGES (CONT'D)
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