York OPTIVIEW - More VSD Safety Shutdowns

JOHNSON CONTROLS
133
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
FORM 160.78-O2
ISSUE DATE: 5/22/2017
2
MESSAGE DESCRIPTION
VSD – 105% MOTOR CURRENT
OVERLOAD
The highest of the three motor RMS currents is monitored and compared against 105%
of the motor current limit of 525A If this value is exceeded continuously for 40 seconds,
this shutdown is generated. The 40 second timer shall reset if three consecutive RMS
current values fall below the overload threshold. When the condition clears, the chiller
can be started after the CLEAR FAULTS key is pressed.
VSD – MOTOR CURRENT THD
FAULT
Motor current (inverter output) total harmonic distortion (THD) level is exceed. The fault
is based on a xed value of measured harmonic current from the inverter. When the
condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
VSD – PHASE A INPUT DCCT
The input current in each phase to the VSD is measured during the precharge time. If
the input current does not exceed the shutdown value for the given model of drive listed
below, then this shutdown is generated.
DRIVE
MODEL
MINIMUM INPUT CURRENT
SHUTDOWN VALUE
0490A, 490 5.0 amps
744 15.0 amps
When the condition clears, the chiller can be started after the CLEAR FAULTS key is
pressed.
VSD – PHASE B INPUT DCCT See “VSD –PHASE A INPUT DCCT” message preceeding.
VSD – PHASE C INPUT DCCT See “VSD – PHASE A INPUT DCCT” message preceeding.
VSD – PHASE A MOTOR DCCT
This shutdown determines if the cable at the motor DCCT is connected. This shutdown
is generated 1.5 seconds after the motor run command if the motor current does not
exceed 25 amps.
VSD – PHASE B MOTOR DCCT See “VSD –PHASE A MOTOR DCCT” message preceeding.
VSD – PHASE C MOTOR DCCT See “VSD – PHASE A MOTOR DCCT” message preceeding.
VSD – PRECHARGE LOCKOUT
If the unit fails to complete pre-charge (due to VSD – PRECHARGE – LOW DC BUS
VOLTAGE or VSD – PRECHARGE – HIGH DC BUS VOLTAGE), the VSD logic board
shall time 10 seconds before clearing the fault and allowing another pre-charge to start.
The unit’s fan(s) and water pump(s) shall remain energized during this time. The VSD
logic board shall allow up to three consecutive pre-charge-related faults to occur. After
the third consecutive pre-charge-related fault, this shutdown is generated. When the
condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
VSD – RECTIFIER PROGRAM
FAULT
When some internal code exception of Rectier happens such as divide-by-zero, out-
of-range parameter, etc., the unit shall trip and the Raptyr Logic Board shall indicate the
rectier program fault and the error information including module number and line num-
ber via the communications link. When the condition clears, the chiller can be started
after the CLEAR FAULTS key is pressed.
VSD SHUTDOWN –
REQUESTING FAULT DATA
The VSD has shut down the chiller and the control center has not yet received the
cause of the fault from the VSD, via the serial communications link. The VSD shuts
down the chiller by opening the Motor Controller “VSD Stop Contacts” (located on the
VSD Logic Board and connected between TB6-16 and TB6-53 in the control center).
The Microboard in the control center then sends a request for the cause of the fault to
the VSD Logic Board over the serial link. Since serial communications are initiated ev-
ery 2 seconds, this message is typically displayed for a few seconds and then replaced
with one of the other VSD fault messages.
VSD - INVERTER PROGRAM
FAULT
This drive will be used on 2 different motor designs. It is necessary to validate that the
inverter software is correct for the motor designed used in the application. To ensure
that the correct software is installed in the VSD logic board, three pieces of data must
state that the correct inverter software is installed in the VSDF logic board for this shut-
down not to occur. The software in the VSD logic board U38, must match the condition
on J2 pin 14 and the programmed motor selection from the chiller control center.
TABLE 9 - SAFETY SHUTDOWN MESSAGES (CONT'D)