Danfoss VLT HVAC Drive FC 100 Operating Instructions Manual page 123

®
VLT HVAC DRIVE High Power
Operating Instruction
WARNING 25, Brake resistor short-
circuited:
The brake resistor is monitored during opera-
tion. If it short-circuits, the brake function is
disconnected and the warning appears. The
frequency converter still works, but without
the brake function. Turn off the frequency
converter and replace the brake resistor (see
par. 2-15
ALARM/WARNING 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 s, on the basis of the resist-
ance value of the brake resistor (par. 2-11)
and the intermediate circuit voltage. The
warning is active when the dissipated braking
power is higher than 90%. If
selected in par. 2-13, the frequency converter
cuts out and issues this alarm, when the dis-
sipated braking power is higher than 100%.
WARNING/ALARM 27, Brake chopper
fault:
The brake transistor is monitored during op-
eration and if it short-circuits, the brake func-
tion disconnects and the warning comes up.
The frequency converter is still able to run, but
since the brake transistor has short-circuited,
substantial power is transmitted to the brake
resistor, even if it is inactive.
Turn off the frequency converter and remove
the brake resistor.
ALARM/WARNING
failed:
Brake resistor fault: the brake resistor is not
connected/working.
WARNING/ALARM 29, Drive over tem-
perature:
If the enclosure is IP 20 or IP 21/TYPE 1, the
cut-out temperature of the heat-sink is 95
+5 o C. The temperature fault cannot be reset,
until the temperature of the heatsink is below
70 o C.
The fault could be:
-
-
Brake Check
).
Trip [2] has been
Warning: There is a risk of sub-
stantial power being transmit-
ted to the brake resistor if the
brake transistor is short-circuit-
ed.
28, Brake
Ambient temperature too high
Too long motor cable
MG.11.F1.02 - VLT ® is a registered Danfoss trademark
ALARM 30, Motor phase U missing:
Motor phase U between the frequency con-
verter and the motor is missing.
Turn off the frequency converter and check
motor phase U.
ALARM 31, Motor phase V missing:
Motor phase V between the frequency con-
verter and the motor is missing.
Turn off the frequency converter and check
motor phase V.
ALARM 32, Motor phase W missing:
Motor phase W between the frequency con-
verter and the motor is missing.
Turn off the frequency converter and check
motor phase W.
ALARM 33, Inrush fault:
Too many powerups have occured within a
short time period. See the chapter
Specifications
for the allowed number of pow-
erups within one minute.
WARNING/ALARM 34, Fieldbus commu-
nication fault:
The fieldbus on the communication option
card is not working.
ALARM 38, Internal fault:
Contact your local Danfoss supplier.
WARNING 47, 24 V supply low:
The external 24 V DC backup power supply
may be overloaded, otherwise contact your
Danfoss supplier.
ALARM 48, 1.8 V supply low:
Contact your Danfoss supplier.
WARNING 49, Speed limit:
The speed has been limited by range in par.
4-11 and par. 4-13.
ALARM 50, AMA calibration failed:
Contact your Danfoss supplier.
check
ALARM 51, AMA check Unom and Inom:
The setting of motor voltage, motor current,
and motor power is presumably wrong. Check
the settings.
ALARM 52, AMA low Inom:
The motor current is too low. Check the set-
tings.
o
C
ALARM 53, AMA motor too big:
The motor is too big for the AMA to be carried
out.
ALARM 54,
AMA motor too small:
The motor is too small for the AMA to be car-
ried out.
6. Warnings and Alarms
General
123
6