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FORM 160.78-O2
ISSUE DATE: 5/22/2017
TABLE 6 - WARNING MESSAGES (CONT'D)
MESSAGE
WARNING – EXCESS SURGE
DETECTED
WARNING – MOTOR –
HIGH HOUSING
TEMPERATURE
WARNING - MOTOR –
HIGH WINDING
TEMPERATURE
WARNING – REAL TIME
CLOCK FAILURE
WARNING – SETPOINT
OVERRIDE
WARNING – VSD –
INPUT VOLTAGE IMBALANCE
JOHNSON CONTROLS
(Applies only if Surge Protection SHUTDOWN feature is Disabled) The Surge Window
Count has exceeded the Count Limit. Message can be manually cleared after the Surge
Window Count is less than or equal to the Count Limit, or the SHUTDOWN feature is
Enabled or the chiller is stopped. To clear message press WARNING RESET key on
HOME Screen when logged in at OPERATOR (or higher) access level.
The Motor Housing Temperature is greater than or equal to 167°F (75°C). This warning
is released when Motor Housing Temperature is less than 158°F (70°C).
This warning occurs when any of the enabled motor winding temperatures exceeds
275°F (135°C) for 3 continuous seconds. This warning will automatically clear when all
winding temperatures decrease below the warning threshold. Also it will not act on any
individual winding temperature sensor that has been disabled with the TEMPERATURE
DISABLED Setpoint on the Motor Details Screen.
During the initialization process that occurs when power is applied to the control center,
test data is written to a location in the BRAM battery backed memory device (IC loca-
tion U52 on Microboard). This data is then read from the BRAM and compared to the
test data. If the read data is not the same as that which was written to the device, it is
assumed the BRAM and Real time Clock operation is defective and this message is dis-
played. The BRAM should be replaced by a qualified Service Technician. This message
automatically clears when the BRAM problem has been solved.
A blank BRAM battery-backed memory device (IC location U52 on Microboard) or a
failure of this device was detected during the initialization process that occurs when
power is applied to the control center. Due to this failure, any or all of the programmed
Setpoints could have been corrupted. Therefore, all Setpoints have been automati-
cally changed to their Default values. All Setpoints will have to be programmed to their
desired values. This message will clear when the WARNING RESET key is pressed in
OPERATOR (or higher) access mode.
Line voltage imbalance shall be calculated, for every VSD communications cycle, as:
max (|V
V
=
imb%
where V
, V
and V
are line-to-line total rms voltages received from the drive, max is
ab
bc
ca
the function which selects the largest of its arguments, and:
If Vimb% exceeds 5% continuously for 45 seconds, the warning will be displayed. The
45 second timer shall reset and the warning shall clear if three consecutive imbalance
readings fall below the 5% threshold.
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
DESCRIPTION
-V
|,|V
-V
|,|V
-V
|)
ab
avg
bc
avg
a
avg
V
avg
|V
|+|V
|+|V
ab
bc
ca
V
=
3
avg
x 100%
|
117
2
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