York YMC2 - Page 97

JOHNSON CONTROLS
97
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
MESSAGE DESCRIPTION
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. 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 key is pressed.
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
VSD – HIGH PHASE B INPUT
CURRENT
See “VSD – HIGH PHASE A INPUT CURRENT” message preceding.
VSD – HIGH PHASE C INPUT
CURRENT
See “VSD – HIGH PHASE A INPUT CURRENT” message preceding.
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. 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 key is pressed.
DRIVE MODEL MOTOR CURRENT FAULT VALUE
0490, 0490A 776 Amps
0612A 1094 Amps
0730A, 0774 1317 Amps
1278A 2164 Amps
VSD – HIGH PHASE B MOTOR
CURRENT
See “VSD – HIGH PHASE A MOTOR CURRENT” message preceding.
VSD – HIGH PHASE C MOTOR
CURRENT
See “VSD – HIGH PHASE A MOTOR CURRENT” message preceding.
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 com-
munications links are established. If this process is not completed the OptiView panel will
indicate this fault. There are several causes for an unsuccessful initialization as follows:
• Serial data communications must be established. Refer to VSD – Serial Communi-
cations fault. If communications between the VSD Logic Board, and control center
Microboard does not take place during initialization, this message will be generated.
The Serial communications can be veried 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 – INVALID SETPOINTS
The VSD Logic Board is able to determine which model of drive can run which model
of motor. If the Control Center provides a model of motor that is not compatible with this
model of VSD, then this shutdown is generated. When this condition clears, the chiller
can be started after the CLEAR FAULTS key is pressed.
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.
This message usually means the power to the VSD has been removed.
TABLE 11 - CYCLING SHUTDOWN MESSAGES (CONT'D)