Johnson Controls York YKEP Series User Manual

FORM 160.77-O2
ISSUE DATE: 11/15/2011
JOHNSON CONTROLS
126
SECTION 5 - DISPLAY MESSAGES
Pri VSD Read Fail
The MV VSD Logic Board has shut down the chiller
but the Control Center has not yet received the cause
of the fault from the MV VSD, via the serial commu-
nications link. The MV VSD shuts down the chiller by
opening the Motor Controller MV VSD Stop Contacts.
The Control Center then sends a request for the cause
of the fault to the Logic Board over the serial commu-
nications link.
Pri VSD Write Fail
This message is generated when the checksum test
failed at power up. Check to see that the proper pro-
gram is loaded to the controller board. Press the RE-
SET button to clear the message.
Pri VSD Read Trip
After communications have been established, if the
Control Center does not receive a reply within 3 con-
secutive read attempts, a shutdown is performed. This
same shutdown is performed if the Variable Speed
Drive does not receive a response from the control
center after 3 consecutive read attempts to communi-
cate with the Control Center after INITIALIZATION
has been successfully completed. The Control Center
attempts to establish communications until successful.

Johnson Controls York YKEP Series Specifications

General

Brand	Johnson Controls
Model	York YKEP Series
Category	Chiller
Language	English