WARNING/ALARM 17, Control word timeout
There is no communication to the adjustable frequency drive.
The warning will only be active when par. 8-04
Control Word Timeout Function
is NOT set to OFF.
If par. 8-04
Control Word Timeout Function
is set to
Stop
and
Trip
, a warning appears and the
adjustable frequency drive ramps down until it trips, while giving an alarm.
Troubleshooting:
Check connections on the serial communication cable.
Increasepar. 8-03
Control Word Timeout Time
Check the operation of the communication equipment.
Verify a proper installation based on EMC requirements. See section 5.
WARNING 22, Hoist mechanical brake
The report value will show what kind it is.
0 = The torque reference was not reached before timeout.
1 = There was no brake feedback before the timeout.
WARNING 23, Internal fan fault
The fan warning function is an extra protective function that checks if the fan is running/mounted.
The fan warning can be disabled in par. 14-53
Fan Monitor
([0] Disabled).
For the D, E, and F frame adjustable frequency drives, the regulated voltage to the fans is moni-
tored.
Troubleshooting:
Check fan resistance (see section 6.2.9 or 6.2.10).
Check soft charge fuses (see section 6.2.1 or 6.2.3).
WARNING 24, External fan fault
The fan warning function is an extra protective function that checks if the fan is running/mounted.
The fan warning can be disabled in par. 14-53
Fan Monitor
([0] Disabled).
For the D, E, and F frame adjustable frequency drives, the regulated voltage to the fans is moni-
tored.
Troubleshooting:
Check fan resistance (see section 6.2.9 or 6.2.10).
Check soft charge fuses (see section 6.2.1 or 6.2.3).
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If it short circuits, the brake function is discon-
nected and the warning appears. The adjustable frequency drive still works, but without the brake
function. Turn off the adjustable frequency drive and replace the brake resistor (see
par. 2-15
Brake Check
).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated: as a percentage, as a mean value over
the last 120 seconds, on the basis of the resistance value of the brake resistor, and the inter-
mediate circuit voltage. The warning is active when the dissipated braking energy is higher than
90%. If
Trip
[2] has been selected in par. 2-13
Brake Power Monitoring
, the adjustable frequency
drive cuts out and issues this alarm, when the dissipated braking energy is higher than 100%.
Warning: There is a risk of substantial power being transmitted to the brake resistor
if the brake transistor is short-circuited.
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
4 Troubleshooting
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
4-13
4
Summary of Contents for VLT HVAC FC 100
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