Safety Shutdowns; General Information; Motor Or Starter - Current Imbalance; Vsd - 105 % Motor Current Overload - York VSD 270 Operation Manual

FORM 160.00-O4
ISSUE DATE: 12/19/2017

SAFETY SHUTDOWNS

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.

TABLE 3 - SAFETY SHUTDOWNS

MESSAGE
Motor or Starter – Current
Imbalance
MOTOR OR STARTER – CURRENT
IMBALANCE
VSD - 105 % Motor Current
Overload
105% MOTOR CURRENT OVERLOAD
VSD - High Converter
Heatsink Temperature
HIGH CONVERTER HEATSINK TEMP
VSD - High Inverter Baseplate
Temperature (270, 292, 351
and 424 Hp drives)
HIGH INVERTER BASEPLATE
TEMPERATURE FLT
24
• If the chiller is running at the time of the shut-
• The message "VSD Shutdown - Requesting Fault
• The OSCD or Harmonic Filter Logic Board will
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may be restarted if the shutdown is no longer active.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.
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.
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.
A thermistor sensor is located of the copper chill plate of the OSCD Power Unit. If
at anytime this thermistor detects a temperature of 170°F (76°C) or higher a shut-
down will occur. The cooling fans and coolant pump on the OSCD will continue to
run after the shutdown until the thermistor temperature has dropped below 160°F
(71°C). This shutdown requires a manual reset via the Reset push-button on the
OSCD logic board.
A thermistor sensor is located inside the transistor module on the OSCD power
unit. If at anytime this thermistor detects a temperature of 175°F (79°C) or higher a
shutdown will occur. The cooling fans and coolant pump on the OSCD will con-
tinue to run after the shutdown until the thermistor temperature has dropped below
165°F (74°C). This shutdown requires a manual reset via the Reset push-button on
the OSCD logic board.
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).
Data"...will be displayed when the Control Center
is requesting the fault data from the OSCD.
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.
DESCRIPTION
JOHNSON CONTROLS