JOHNSON CONTROLS
20
FORM 160.00-O10
ISSUE DATE: 8/24/2020
SECTION 3 - CYCLING SHUTDOWNS
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
1100
3304 Amps
1300
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
1100/1300
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
communications 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 Communications
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 verified 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.
VSD – LOGIC BOARD
PROCESSOR
This shutdown is generated if a communications problem occurs between the two
microprocessors on the VSD Logic Board.
VSD – LOW PHASE A INPUT
BASEPLATE TEMPERATURE
The temperature of the input baseplate phase A has decreased below the low limit of
37°F (2.7°C). All phase temperatures have to increase above the fault-reset threshold of
42°F (5.5°C), for this fault to be cleared. The cooling fans and pumps will turn on while
this shutdown is present. They will turn off when the temperature rises above the fault-
reset threshold.
VSD – LOW PHASE B INPUT
BASEPLATE TEMPERATURE
See “VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE” message preceding.
TABLE 3 -
CYCLING SHUTDOWN MESSAGE (CONT'D)