Danfoss VLT HVAC Drive FC 102 Programming Manual page 218

Troubleshooting
The following warning/alarm information 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 <10 V from terminal 50.
Remove some of the load from terminal 50, as the 10 V
supply is overloaded. Maximum 15 mA or minimum 590 Ω.
4 4
A short circuit in a connected potentiometer or incorrect
wiring of the potentiometer can cause this condition.
Troubleshooting
•
Remove the wiring from terminal 50. If the
warning clears, the problem is with the wiring. If
the warning does not clear, replace the control
card.
WARNING/ALARM 2, Live zero error
This warning or alarm only appears if programmed in
parameter 6-01 Live Zero Timeout Function. The signal on 1
of the analog inputs is less than 50% of the minimum
value programmed for that input. Broken wiring or a faulty
device sending the signal can cause this condition.
Troubleshooting
•
Check the connections on all the analog mains
terminals.
-
-
-
•
Check that the frequency converter programming
and switch settings match the analog signal type.
•
Perform an input terminal signal test.
WARNING/ALARM 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 in parameter 14-12 Function at
Mains Imbalance.
Troubleshooting
•
Check the supply voltage and supply currents to
the frequency converter.
WARNING 5, DC link voltage high
The DC-link voltage (DC) is higher than the high-voltage
warning limit. The limit depends on the frequency
converter voltage rating. The unit is still active.
WARNING 6, DC link voltage low
The DC-link voltage (DC) is lower than the low-voltage
warning limit. The limit depends on the frequency
converter voltage rating. The unit is still active.
216
®
VLT
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, and 5 for
signals, terminals 2, 4, and 6 common.
Danfoss A/S © 03/2015 All rights reserved.
HVAC Drive FC 102
WARNING/ALARM 7, DC overvoltage
If the DC-link voltage exceeds the limit, the frequency
converter trips after a time.
Troubleshooting
•
Connect a brake resistor.
•
Extend the ramp time.
•
Change the ramp type.
•
Activate the functions in parameter 2-10 Brake
Function.
•
Increase parameter 14-26 Trip Delay at Inverter
Fault.
•
If the alarm/warning occurs during a power sag,
use kinetic back-up (14-10 Mains Failure).
WARNING/ALARM 8, DC under voltage
If the DC-link voltage drops below the undervoltage limit,
the frequency converter checks if a 24 V DC back-up
supply is connected. If no 24 V DC back-up supply is
connected, the frequency converter trips after a fixed time
delay. The time delay varies with unit size.
Troubleshooting
•
Check that the supply voltage matches the
frequency converter voltage.
•
Perform an input voltage test.
•
Perform a soft charge circuit test.
WARNING/ALARM 9, Inverter overload
The frequency converter has run with more than 100%
overload for too long and is about to cut-out. The counter
for electronic thermal inverter protection issues a warning
at 98% and trips at 100%, while giving an alarm. The
frequency converter cannot be reset until the counter is
below 90%.
Troubleshooting
•
Compare the output current shown on the LCP
with the frequency converter rated current.
•
Compare the output current shown on the LCP
with the measured motor current.
•
Display the thermal frequency converter load on
the LCP and monitor the value. When running
above the frequency converter continuous
current rating, the counter increases. When
running below the frequency converter
continuous current rating, the counter decreases.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the frequency converter
issues a warning or an alarm when the counter reaches
100% in parameter 1-90 Motor Thermal Protection. The fault
occurs when the motor runs with more than 100%
overload for too long.
MG11CE02