Bell & Gossett P2001489 Integrated Technologic with Sensorless Control - Manual (Page 44)

Warning/Alarm Description Cause Remedy
2 — Live zero error This warning or alarm will
only appear if programmed
by the user in 6–01 Live
Zero Timeout Function. The
signal on one of the analog
inputs is less than 50% of
the minimum value that is
programmed for that input.
Broken wiring or faulty
device sending the signal.
Check the connections on
all the analog input
terminals. Control card
terminals 53 and 54 for
signals, terminal 55
common. MCB 101
terminals 11 and 12 for
signals, terminal 10
common. MCB 109
terminals 1, 3, 5 for signals,
terminals 2, 4, 6 common.
Check that the frequency
converter programming
and switch settings match
the analog signal type.
Perform Input Terminal
Signal Test
4 — Mains phase loss A phase is missing on the
supply side, or the mains
voltage imbalance is too
high. This message also
appears for a fault in the
input rectifier on the
frequency converter.
Options are programmed at
14–12 Function at Mains
Imbalance.
Check the supply voltage
and supply currents to the
frequency converter.
5 — DC link voltage high The intermediate circuit
voltage (DC) is higher than
the high voltage warning
limit.
The limit is dependent on
the frequency converter
voltage rating. The
frequency converter is still
active.
6 — DC link voltage low The intermediate circuit
voltage (DC) is lower than
the low voltage warning
limit.
The limit is dependent on
the frequency converter
voltage rating. The
frequency converter is still
active.
7 — DC overvoltage If the intermediate circuit
voltage exceeds the limit,
the frequency converter
trips after a time.
Connect a brake resistor
Extend a ramp time
Change the ramp type
Activate functions in 2–10
Brake Function
Increase 14–26 Trip Delay at
Inverter Fault
8 — DC under voltage If the intermediate circuit
voltage (DC) drops below
the under voltage limit, the
frequency converter checks
if a 24 VDC backup supply
is connected.
If no 24 VDC backup supply
is connected, the frequency
converter trips after a fixed
time delay. The time delay
varies with unit size.
Check that the supply
voltage matches the
frequency converter
voltage.
Perform input voltage test
Perform soft charge and
rectifier circuit test.
Troubleshooting
42 Integrated Technologic ® with Sensorless Control INSTRUCTION MANUAL