Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

Page: 93 / 162

Table 89: Warning messages
Message Description
WARNING – UPS – LINE LOW
BATTERY VOLTAGE
This auto reset warning is set when all of the following are true:
• Control Voltage digital input is high (indicates line power is available)
• Battery Voltage < Line Low Battery Voltage Threshold
It releases when Battery Voltage > Line Low Battery Voltage Thr 0.1 V.
WARNING – UPS – NOT
CHARGING
This auto reset warning is set when all of the following are true for 5 continuous seconds:
Control Voltage digital input is high (indicates line power is available)
• UPS Line / Charging digital input is low (indicates UPS not reporting in charge mode)
It releases when any of the following are true:
• Control Voltage digital input is low (indicates line power is lost)
• UPS Line / Charging digital input is high (UPS is reporting in charge mode)
WARNING – VSD – INPUT
VOLTAGE IMBALANCE
Line voltage imbalance is calculated, for every drive communications cycle, as:
where V
ab
, V
bc
and V
ca
are line-to-line total rms voltages received from the drive, max is the
function which selects the largest of its arguments, and:
If Vimb% exceeds 5% continuously for 45 seconds, the warning is displayed. The 45 second
timer resets and the warning clears if three consecutive imbalance readings fall below the
5% threshold.
Routine shutdown messages
Table 90: Routine shutdown messages
Message Description
LOCAL STOP A local shutdown command has been received by pressing the Keypad Stop key.
REMOTE STOP
A shutdown command has been received from a remote device. Remote Stop commands
can be received in Digital Remote mode via I/O Board TB4-7/8 or in BAS (ISN) (Integrated
Systems Network) Remote mode via the SC-Equip Gateway serial communications. If the
chiller is running when this occurs, the chiller performs a soft shutdown.
93 YVAM Control Center