JOHNSON CONTROLS
108
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
MESSAGE DESCRIPTION
VSD – HIGH TOTAL
DEMAND DISTORTION
This shutdown indicates the input current to the VSD is not sinusoidal. This shutdown will occur
if the Total Demand Distortion (TDD) exceeds 25% continuously for 45 seconds. The displayed
TDD is the sum of the harmonic currents up to the 50th harmonic supplied by the main power to
the VSD divided by the Full Load Amps. The chiller can be started after the CLEAR FAULT key is
pressed.
VSD – INPUT CUR-
RENT
OVERLOAD
The input current overload value is variable based on the Input Job Full Load Amps value pro-
grammed at the Control Panel. The input current overload value is 1.16 times the Input Job Full
Load Amps value, but not to exceed the value for the given model of drive listed below. This cal-
culation takes into account installations where the input line voltage could be up to 10% below the
nominal value. An additional 5% of current is added to reduce nuisance shutdowns due to power
uctuations. To provide addition time for the chiller too unload, the input current overload value
must be greater than the shutdown value for 10 continuous seconds for this shutdown to occur.
When the condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
DRIVE MODEL INPUT CURRENT MAXIMUM OVERLOAD
0490 416 Amps
0490A 511 Amps
0612A, 0730A 650 Amps
0774 825 Amps
1278A 1195 Amps
VSD – INPUT DCCT
OFFSET LOCKOUT
If three consecutive VSD – Phase A, B or C Input DCCT Offset cycling faults occur, this safety
shutdown is generated to require investigation and manual reset. When the condition clears the
chiller can be started after the CLEAR FAULTS key is pressed.
VSD – INVERTER
PROGRAM FAULT
The VSD software contains a verication process to ensure that the correct set of software is
installed in the VSD logic board for the application. When this condition clears, the chiller can be
started after the CLEAR FAULTS key is pressed.
VSD – LINE VOLTAGE
PHASE ROTATION
The input voltage to the VSD is not phase rotation sensitive, but the VSD must be able to deter-
mine the correct input phase rotation. If the VSD logic board cannot determine the correct phase
rotation, then this shutdown is generated. When this condition clears, the chiller can be started
after the CLEAR FAULTS key is pressed.
VSD – LOGIC BOARD
HARDWARE
After power is applied to the chiller, the VSD logic board performs several internal tests to en-
sure proper operation of the input power device. If the tests fail, then this shutdown is generated.
When this condition clears, the chiller can be started after the CLEAR FAULTS key is pressed.
VSD – LOGIC BOARD
PLUG
A jumper is located in the rectier and inverter current transformers connectors that indicate the
connector is properly installed. If either connector is not installed, then this shutdown is gener-
ated. When the condition clears, the chiller can be started after the CLEAR FAULTS key is
pressed.
VSD – MOTOR
CURRENT
IMBALANCE
Each phase of motor current is compared against the average of the three phases of motor
current to determine the current imbalance value. If the current imbalance value is greater than
32 amps for a period of 45 seconds, then this shutdown is generated. For example: The three
motor current RMS values are 200, 225, and 240 amps. This would be calculated to an average
current of (200 + 260 + 240)/3 = 233 amps. Subtract the real current value from the average
value. 200 – 233 = 33, 260 – 233 = 33, 240 – 233 = 7. If this condition or worse were maintained
for 45 seconds, then this shutdown is generated, because the motor current imbalance is 33
amps. The chiller can be started after the CLEAR FAULTS key is pressed.
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)
To Next Page
Loading...
