Colasit CMVpro 125-400 ATEX, Operating Instructions Manual, Page: 65 / 88

Repair | 12
Operating instructions CMVpro 125-400 ATEX | Version 1-en 65 / 88
Fault Possible cause Fault discovery Remedy
Observe minimum dis-
tance between fan
connection and
damper valve or duct
bend (L > 3 x duct Ø).
Operating
speed cannot
be reached. Faulty motor winding. Winding measure-
ment. Replace electric motor
_
Chap. 12.7 [
}
73].
Improper phase volt-
age. Measure phase volt-
age. Check/replace fuses,
motor connection ca-
ble, FC cable.
Motor overload due to
improperly positioned
damper valve. Measure flow rate and
pressure at the operat-
ing point. Set damper valve to
proper position.
Motor overload due to
system changes. Fan/electric motor no
longer meeting the op-
erating point. Consult with point of
contact (see title
page).
FC error mes-
sage. Improper setting of
motor characteristics,
start/stop ramps, ac-
celeration/braking
time. FC display: check rele-
vant parameters. Set parameters prop-
erly
_ Chap. 8.3.2 [ } 50].
FC error mes-
sage. No ac-
celeration from
low frequency. FC current limits are
exceeded due to insuf-
ficient power factor
(cos φ). FC current limits too
low? Adjust FC parameter
"Motor characteris-
tic" (torque quadratic
to speed)
_ Chap. 8.3 [ } 47].
Improper motor and/or
FC size. Motor and/or FC too
small? Design FC according
to motor
_ Chap. 8.3 [ } 47].
Start ramp too steep
or acceleration time
too short. Check FC parameters. Adjust start ramp. In-
crease acceleration
time.
Motor protec-
tion switch,
PTC thermistor
tripping device,
or FC switches
off. Improper setting. Measure current draw. Set motor protection
switch properly
_
Chap. 8.2.2 [
}
46].
Check FC parameters. Parameterize FC prop-
erly.
Faulty motor connec-
tion. Measure current draw. Check motor connec-
tion (star/delta)
_ Chap. 8.5 [ } 52].