Warnings And Alarm Definitions - Frequency Converter - Danfoss VLT FC 302 Operating Instructions Manual

Warnings and Alarms
Warning LED
Warning On
Alarm Off
Trip-Lock On
Table 9.1 Status Indicator Lights Explanations
9.4 Warnings and Alarm Definitions -
Frequency Converter
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.
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
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. Broken wiring or a faulty
device sending the signal can cause this condition.
Troubleshooting
•
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 an input terminal signal test.
WARNING/ALARM 3, No motor
No motor has been connected to the output of the
frequency converter.
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 14-12 Function at Mains
Imbalance.
MG37A202
Operating Instructions
Alarm LED
Off
On (Flashing)
On (Flashing)
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
frequency converter 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
frequency converter voltage rating. The unit is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
frequency converter trips after a time.
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.
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%.
Danfoss A/S © Rev. 2014-07-29 All rights reserved.
Troubleshooting
•
Check the supply voltage and supply currents to
the frequency converter.
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.
•
If the alarm/warning occurs during a power sag,
use kinetic back-up (14-10 Mains Failure).
Troubleshooting
•
Check that the supply voltage matches the
frequency converter voltage.
•
Perform an input voltage test.
•
Perform a soft charge circuit test.
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 drive 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.
9 9
123