NORD Drivesystems BU0750 - Manual (Page 20)

NORDAC SK 750E Manual
20 Subject to technical amendments BU 0750 GB-3311
2.8 Electrical Connection
WARNING
NOTE
THESE DEVICES MUST BE EARTHED.
Safe operation of the devices requires that is installed and commissioned by qualified
personnel in compliance with the instructions provided in this Manual.
In particular, the general and regional installation and safety regulations for work on
high voltage systems (e.g. VDE) must be complied with as must the regulations
concerning correct use of tools and the use of personal protection equipment.
Dangerous voltages can be present at the motor connection terminals even when the
inverter is switched off. Always use insulated screwdrivers on these terminal fields.
Ensure that the input voltage source is not live before setting up or changing
connections to the unit.
Make sure that the inverter and motor have the correct supply voltage set.
Switching of the motor or brake resistor cable in not permitted when they are
connected to a voltage.
2.9 Electrical connection of power unit
The line, motor, brake resistor and control connections are located on the underside of the device. To gain
access to the terminals, the device covers (cover and terminal cover) must be removed. The connection
terminals are now accessible from the front or from above. The cables must be fed into the frequency inverter
via suitable screw fittings and pretected from tension. All covers must be put back in place before switching on
the supply voltage!
PE L1 L2 L3
PE L1 L2 L3 +B -B PE
U V W PE
T1 T2
M
3 ~
Mains connection
a) 3 ~ 220-240V ~
b) 3 ~ 380-440V ~
c) 3 ~ 460/480V ~
Brake resistor
connection
R = 10- 40Ω
for further
details see
Section
9.2/9.3
3~ motor
connection
Star/Delta
Temperature
sensor
(PTC)
+Br -Br PE
Electro-
magnetic
brake coil
a) 105V =
b) 180V =
c) 205V =