NORD Drivesystems BU0300 - Manual (Page 19)

2 Assembly and installation
BU 0300 EN Subject to technical alterations 19
2.3.6 Mounting the SK 300E frequency inverter
The frequency inverter must first be removed before it can be electrically connected. To do this, undo the 4
fastening screws (Fig. 1) so that the frequency inverter can be lifted off vertically (Fig. 2). After connecting the
supply voltage, the frequency inverter must be vertically reattached (Fig. 3), beginning with the plugs on the
rating plate side which ensure that the inverter is positioned correctly. Further information about attaching
customer units can be found in Chap. 3.3.3 “Mounting the customer unit”
In order to achieve the maximum protection class IP55 / IP66, it must be ensured that all fastening screws of
the frequency inverter are tightened in the specified sequence from screw 1 to screw 4 and with the torque
specified in the table below. Use appropriate screwed connections for the connection line cable cross-section.
Dissipation of heat generated by the inverter occurs via convection . The driven motor must have normal
ventilation. Heat dissipation must not be hindered by significant contamination.
A cover plate with 2 LEDs is normally located on the top side of the frequency inverter. These LEDs show the
status of the frequency inverter. Note that the green LED constantly lights when the mains voltage is applied,
and the red LED according to the error message, e.g. 5 flashes - pause - 5 flashes, etc. for the error E005.
Fig.1: Fastening screws Fig.2: Removing the SK 300E
Cinch connector
Fig.3: Attaching the SK 300E
Screw 2 Screw 1
Screw 4 Screw 3
Frequency inverter size Screw size Tightening torque
S 1 M5 x 35 3.5Nm ± 20%
S 2 M5 x 50 3.5Nm ± 20%