York VSD 292 Series - Section 3 - Safety Shutdowns; General Information; Motor or Starter - Current Imbalance; VSD - 105 % Motor Current Overload

JOHNSON CONTROLS
31
FORM 160.00-O4
ISSUE DATE: 07/31/2019
3
GENERAL INFORMATION
The Shutdowns are organized in alphabetical order
based on the OptiView™ Control Center messages.
The Microcomputer Control Center messages are also
included under these headings.
Whenever a Safety Shutdown is generated by the
OSCD or Harmonic Filter Logic Board, a series of
events will occur.
• If the chiller is not running at the time of the shut-
down, the OSCD Logic Board will not turn on the
gate drivers.
• The K1 relay on the OSCD logic board will de-
energize to indicate to the Control Center that the
OSCD has shutdown. The K1 relay will remain
de-energized until the cause of the shutdown has
been corrected.
• If the chiller is running at the time of the shut-
down, the Control Center will start a coastdown
period (150 seconds for centrifugal chillers or
shorter for those chillers that contain the optional
“Quick Start” feature).
• The message “VSD Shutdown - Requesting Fault
Data”...will be displayed when the Control Center
is requesting the fault data from the OSCD.
• The OSCD or Harmonic Filter Logic Board will
send a shutdown code via the communications
link to the Control Center. The Micro Board will
interpret the shutdown code and display a shut-
down message on the display of the Control Cen-
ter.
After the coastdown period has timed out, the chiller
may be restarted if the shutdown is no longer active.
Place the Compressor Switch in the Stop/Reset posi-
tion, and then into the Start position and release. The
chiller will start if no faults are active.
TABLE 3 - SAFETY SHUTDOWNS
MESSAGE DESCRIPTION
Motor or Starter – Current
Imbalance
MOTOR OR STARTER – CURRENT
IMBALANCE
The OSCD logic board generates this shutdown. This shutdown will become active
when the highest of the three motor currents exceeds 80% of the programmed
FLA. After these conditions are met, if any one phase of motor current exceeds
30% of the average current for 45 seconds, a Safety shutdown will be activated.
VSD - 105 % Motor Current
Overload
105% MOTOR CURRENT OVERLOAD
The OSCD logic board generates this shutdown by reading the current from the
3 output current transformers. The shutdown is generated when the OSCD logic
board has detected that the highest of the three output phase currents has ex-
ceeded 105% of the programmed 100% full load amps (FLA) value for more than
40 seconds. This shutdown requires a manual reset via the Reset push-button on
the OSCD logic board.
SECTION 3 - SAFETY SHUTDOWNS