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M1G055-BD91-26
4.5 Checking connections
; Ensure isolation from supply (all phases).
; Make sure a restart is impossible
; Check the cables for proper fit.
4.6 Switching on the device
The device may only be switched on if it has been installed properly and
in accordance with its intended use, including the required safety
mechanisms and professional electrical hookup. This also applies for
devices which have already been equipped with plugs and terminals or
similar connectors by the customer.
; Before switching on, check the device for visible external damage
and make sure the protective devices are functional.
; Check the fan's air flow paths for foreign matter and remove any
foreign matter found.
; Apply the nominal supply voltage.
; Start the device by changing the input signal.
4.7 Switching off the device
; Disconnect the device from the power supply at the supply line's
main switch.
5. INTEGRATED PROTECTIVE FEATURES
The integrated protective functions cause the motor to switch off
automatically in the event of the faults described in the table.
Fault
Rotor position detection error
Blocked rotor
Motor overload
Item no. 50356-5-9970 · ENU · Change 234164 · Approved 2021-08-11 · Page 9 / 10
ebm-papst Mulfingen GmbH & Co. KG · Bachmühle 2 · D-74673 Mulfingen · Phone +49 (0) 7938 81-0 · Fax +49 (0) 7938 81-110 · info1@de.ebmpapst.com · www.ebmpapst.com
Operating instructions
Safety feature description/
function
An automatic restart follows.
; After the blockage is
removed, the motor restarts
automatically.
After cooling off, the device
restarts automatically.
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
The motor restarts automatically when operating voltage
is applied, e.g. after a power failure.
Risk of injury
→ Keep out of the motor's danger zone.
→ When working on the motor, switch off the line voltage
and ensure that it cannot be switched back on.
→ Wait until the motor comes to a stop.
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 some time, e.g. when in storage,
we recommend switching it on for at least two hours to allow
any condensation to evaporate and to move the bearings.
Malfunction/fault
Possible cause
Rotor not running
Imbalance in rotating
smoothly
parts
Motor not turning
Mechanical blockage
Line voltage faulty
Faulty connection
Motor/electronics
Deficient cooling
overtemperature
Possible remedy
Clean the device;
replace it if imbalance
persists after cleaning
Switch off, isolate
from supply and
remove mechanical
blockage.
Check line voltage,
restore power
supply, apply control
signal.
Isolate from supply,
correct connection;
see connection
diagram.
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.
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