Maico DPK 50 EC, Инструкция по эксплуатации, Страница: 26 / 31

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Troubleshooting
Fault Possible cause Action Alarm priority
Fan is not
rotating or
stops after
a various
time.
No supply voltage present.
Check the supply voltage directly at the fan.

In case of fault check the fuses and the wiring of the
service switch.
---
Missing setpoint. Check the setpoint and its correct polarity. ---
Missing enable signal.
Check the 24VDC between “DIN (Enable)“ and GND
clamps.
---
Internal protective feature
has tripped. (Failure can be
read out with the Software
“EC-Param”)
“Over voltage“- Input voltage rises above the tolerance
limit of the specified line voltage.
Check main supply and fuses.

Failure resets automatically after the voltage falls un-
der the maximum limit.
C
“Locked rotor“
Check the fan impeller for overload caused by dirt or for-
eign matters and turn by hand. Check fastenings of motor
and nozzle.

Reset failure
C
“Motor phase error“
Winding interrupted, wire break.

Contact Maico support
C
“Motor over current, I Hi alarm“
Motor-side short circuit.

Contact Maico support
C
“Over temperature motor“
Check the airflow and ambient temperature for its limits.
Ensure better cooling. Check the fan impeller for overload
caused by dirt or foreign matters.

Reset failure
C
“24V supply overload“
Check current consumption of connected devices, re-
move short-circuit.

Failure resets automatically after the value falls under
the maximum limit.
C
Fan turns
but there is
no or not
enough air-
flow.
Rotation speed of the fan too
low.
Please see “fan does not run at maximum speed“. ---
Air flow interrupted. Check duct system (e.g. suction, filter, sealing caps). ---
Calculated pressure does
not correspond to the real
value.
Check fan selection. ---
Unfavorable installation con-
ditions.
Check the installation situation.
(section 6.1)
---
Impeller is rotating in wrong
direction because of external
effects.
“Wrong rotating direction (Windmilling)“
Check installation situation, restart the air-handling unit to
stop the convers airflow.

Reset failure
NC/C