Operating instructions
K3G900-AS08-01
Translation of the original operating instructions
6. MAINTENANCE, MALFUNCTIONS, POSSIBLE
CAUSES AND REMEDIES
Do not perform any repairs on your device. Send the device to ebm-
papst for repair or replacement.
WARNING
Live terminals and connections even with device
switched off
Electric shock
→ Wait five minutes after disconnecting the voltage at all poles
before opening the device.
CAUTION
If control voltage or a stored speed set value is applied,
the motor will restart automatically, e.g. after a power
failure.
Risk of injury
→ Keep out of the device’s danger zone.# When working on
the device, switch off the line voltage and ensure that it
cannot be switched back on.
→ Wait until the device comes to a stop.
→ After working on the device, remove any tools or other
objects from the device.
If the device is out of use for over four months, we recommend
switching it on for at least four hours at full speed to allow any
condensation to evaporate and to move the bearings.
Malfunction/fault
Possible cause
Possible remedy
Impeller not
running smoothly
Imbalance in rotating
parts
Clean the device;
replace it if imbalance
persists after cleaning.
Make sure no
weight clips are
removed during
cleaning.
Motor not turning
Mechanical blockage
Switch off, isolate
from supply and
remove mechanical
blockage.
Line voltage faulty
Check line voltage,
restore power supply.
Attention! The error
message resets
automatically.
Device restarts
automatically without
warning.
Faulty connection
Isolate from supply,
correct connection;
see connection
diagram.
Broken motor winding Replace device
Deficient cooling
Improve cooling. Let
the device cool down.
To reset the error
message, switch off
the line voltage for at
least 25 s and then
switch it on again.
Alternatively, reset
the error message by
applying a control
signal of < 0.5 V to
Din1 or by shorting
Din1 to GND.
Ambient temperature
too high
Reduce the ambient
temperature. Let the
device cool down.
To reset the error
message, switch off
the line voltage for at
least 25 s and then
switch it on again.
Alternatively, reset
the error message by
applying a control
signal of < 0.5 V to
Din1 or by shorting
Din1 to GND.
Impermissible point of
operation (e.g. back
pressure too high)
Correct the operating
point. Let the device
cool down.
To reset the error
message, switch off
the line voltage for at
least 25 s and then
switch it on again.
Alternatively, reset
the error message by
applying a control
signal of < 0.5 V to
Din1 or by shorting
Din1 to GND.
In the event of further malfunctions, contact ebm-papst.
6.1 Vibration testing
Checking of fan for mechanical vibration based on ISO 14694.
Recommendation: Every 6 months. Max. vibration severity is 3.5 mm/
s, measured at the motor fastening diameter on the motor support plate in
the direction of the motor axis of rotation and perpendicular to this.
Item no. 51810-5-9970 · ENU · Change 99339 · Approved 2018-04-27 · Page 11 / 13
ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · [email protected] · www.ebmpapst.com
