Electrical Connections; Connection To The Grid; Motor Protection - Nicotra Gebhardt RLM 53 Betriebsanleitung

BA-CFD-RLM 9.9 – 05/2021

5.4 Electrical connections

5.4.1 Safety notes
 The electrical installation of the fans and components may only be carried out by trai-
ned personnel in observance of these Operating Instructions and the regulations in
force.
 The following Standards and guidelines are to be observed:
- IEC 60364-1 / DIN VDE 0100 ; DIN EN 60204-1
- site regulations of the Electricity Supply Companies
 Equipment in accordance with EN 60204-1 is to be installed as protection during
unexpected events (e.g. an isolation switch for inspections).
Caution electrical hazard!
Electrical potential at intermediate circuit of Driver and power connections if the
permanentmagnet motor rotates!
 do not work at the fan if the impeller/motor is not locked
 lock fan impeller by proper means

Connection to the grid

5.4.2
Connect the fan to the grid according to the enclosed connection diagram or the
enclosed operating instructions (of the drive). For the updated circuit diagrams, please
see online under www.nicotra-gebhardt.com.
CAUTION  PM motors without integrated electronics may only be connected to a
frequency inverter suitable for that purpose.
 It is not permitted to operate more than one of the permanent magnet motors
with one frequency inverter
 Only use screened motor cables.
 The motor cable screen must be attached to both sides.
5.4.3

Motor protection

 Please check the maintenance instructions of the motor manufacturer
 Motors are to be protected against overload in accordance with EN 60204-1.
 Standard motor protection switches are to be provided and set to the nominal motor
current. A higher setting is not permitted!
 Care must be taken to ensure for explosion protected motors that motor protection
devices are utilised which correspond with the te time given on the motor type plate.
 Motors with built-in thermistors or similar must be protected through a thermistor or
similar operated release device.
CAUTION Fuses or circuit breakers do not provide sufficient motor protection. Damage due
to insufficient motor protection invalidates the manufacturer's guarantee.
5.4.4 Motor starting
Motors with a nominal rating of 4kW can generally be direct started.
Motors with a nominal rating >4kW are usually star-delta or soft started. For frequency
inverter operation the start-up ramp must be selected so that the current rating of the motor
is not exceeded.
English
EN-7/18