8.7.4 Fault Messages
The warning/alarm information below defines each
warning/alarm condition, provides the probable cause for
the condition, and details a remedy or troubleshooting
procedure.
WARNING 1, 10 Volts low
The control card voltage is below 10V from terminal 50.
Remove some of the load from terminal 50, as the 10V
supply is overloaded. Max. 15 mA or minimum 590
Ω
.
This condition can be caused by a short in a connected
potentiometer or improper wiring of the potentiometer.
Troubleshooting
Remove the wiring from terminal 50. If the warning clears,
the problem is with the customer wiring. If the warning
does not clear, replace the control card.
WARNING/ALARM 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 programmed for that input. This condition can be
caused by broken wiring or faulty device sending the
signal.
Troubleshooting
Check 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 Adjustable frequency drive
programming and switch settings match the
analog signal type.
Perform Input Terminal Signal Test.
WARNING/ALARM 4, Mains phase loss
A phase is missing on the supply side, or the line voltage
imbalance is too high. This message also appears for a
fault in the input rectifier on the Adjustable frequency
drive. Options are programmed at
14-12 Function at Mains
Imbalance
.
Troubleshooting
Check the supply voltage and supply currents to the
Adjustable frequency drive.
WARNING 5, DC link voltage high
The intermediate circuit voltage (DC) is higher than the
high voltage warning limit. The limit is dependent on the
Adjustable frequency drive voltage rating. The unit is still
active.
WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is lower than the low
voltage warning limit. The limit is dependent on the
Adjustable frequency drive voltage rating. The unit is still
active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
Adjustable frequency drive trips after a time.
Troubleshooting
Connect a brake resistor
Extend the ramp time
Change the ramp type
Activate the functions in
2-10 Brake Function
Increase
14-26 Trip Delay at Inverter Fault
WARNING/ALARM 8, DC undervoltage
If the intermediate circuit voltage (DC link) drops below
the under voltage limit, the Adjustable frequency drive
checks if a 24V DC backup supply is connected. If no 24V
DC backup supply is connected, the Adjustable frequency
drive trips after a fixed time delay. The time delay varies
with unit size.
Troubleshooting
Check that the supply voltage matches the
Adjustable frequency drive voltage.
Perform input voltage test
Perform soft charge circuit test
WARNING/ALARM 9, Inverter overload
The Adjustable frequency drive is about to cut out because
of an overload (too high current for too long). The counter
for electronic, thermal inverter protection gives a warning
at 98% and trips at 100%, while giving an alarm. The
Adjustable frequency drive
cannot
be reset until the
counter is below 90%.
The fault is that the Adjustable frequency drive is
overloaded by more than 100% for too long.
Troubleshooting
Compare the output current shown on the LCP
with the Adjustable frequency drive rated current.
Compare the output current shown on the LCP
with measured motor current.
Display the Thermal Drive Load on the LCP and
monitor the value. When running above the
Adjustable frequency drive continuous current
rating, the counter should increase. When
running below the Adjustable frequency drive
continuous current rating, the counter should
decrease.
See the derating section in the
Design Guide
for more
details if a high switching frequency is required.
General Specifications and ...
VLT
®
HVAC Drive Design Guide
8-36
MG11BB22 - VLT
®
is a registered Danfoss trademark
8
8
