ProMinent Sigma 3 Basic Operating Instructions Manual page 41

Motor
P_SI_0012_SW
Fig. 19: Direction of rotation of motor
WARNING!
ATEX pumps in areas at risk from explosion
– Use a suitable motor protection switch to protect
power end motors. Use motor protection approved
for this application with Ex"e" motors. (Protection
against warming caused by overloading)
– Ensure that motors are only installed and checked in
areas at risk from explosion by a "recognised com‐
petent" person.
– Observe the enclosed operating instructions for the
Ex motor.
WARNING!
Only motors with a frequency converter: Danger of elec‐
tric shock
The danger of electric shock remains for 3 minutes after
the mains voltage has been switched off on conducting
parts of the motor with an integrated frequency converter
and on the lines themselves.
– After switching off, allow the device to stand for 3
minutes before opening the terminal box.
CAUTION!
The motor can be damaged
Provide appropriate motor protection devices (e.g. motor
protection switch with thermal overcurrent trip) to protect
the motor from overloading.
Fuses do not provide motor protection.
CAUTION!
Operation of the system can be disrupted
If a motor protection switch is used, operation of the
system can be disrupted by an inappropriate setting.
– Set the response threshold of the motor protection
switch to approx. 1.4 ... 1.5 times the nominal cur‐
rent of the motor (motor nameplate) (due to pulsing
load).
This does not lead to the motor being overloaded.
CAUTION!
Only motors with a frequency converter: The motor can
be damaged
The input current limiter could be damaged if a motor
with an integrated frequency converter is restarted within
3 minutes of the mains voltage being switched off.
– After switching off, allow the device to stand for at
least 3 minutes before restarting.
– If the motor is controlled via a control, take this into
consideration at the control.
Installation, electrical
41