Nord Drivesystems SK 300P Series - Motor Cable; Braking Resistor (Optionally with Size 2 and Above); Electromechanical Brake (Optionally with Size 2 and Above))

NORDAC ON / ON+ (SK 3xxP) – Manual with installation instructions
34 BU 0800 en-4521
NOTICE
Defect in the device
In case of daisy chain installation, the max. permissible current flowing through the cables is limited
by conductor strips. If the max. permissible current is exceeded, conductor strips in the device may be
damaged.
• Limit the current flowing through the daisy chain cables in such an installation to 12 A.
2.6.5.2 Motor cable
If a shielded motor cable is used or if the cable is installed in a metallic and well-grounded duct, the
total length should not exceed 5 m (connect cable shield to PE at both ends).
Pre-assembled motor cables are available on request.
NOTICE!
Output switching
Switching a motor cable under load causes an impermissible increase of the load on the device.
Components in the power section may be damaged and destroyed either immediately or in the long
term.
• Only switch the motor cable when the frequency inverter is no longer pulsing. I.e. the device must
be in the state "ready for switch-on" or "switch-on block".
2.6.5.3 Braking resistor (optionally with size 2 and above)
During dynamic braking (frequency reduction) of a three-phase motor, electrical energy is returned to
the inverter as necessary. With size 2 and above, an internal braking resistor can be used to avoid
shut-down of the device due to overvoltage. With this, the integrated brake chopper (electronic switch)
pulses the link circuit voltage (switching threshold approx. 720 V DC) into the braking resistor. The
braking resistor converts excess energy into heat.
Internal braking resistor
Installation of a braking resistor is optional. This is carried out at the factory and must therefore be
taken into account in the order. Retrofitting is not possible.
Designation Part number Resistance Continuous
output
Energy
consumption
SK BRI6-1-400-070 275188110
400 Ω
70 W
0.9 kWs
2.6.5.4 Electromechanical brake (optionally with size 2 and above))
For the control of an electromechanical brake, the device generates a PWM signal from the link circuit
provided at the motor plug’s contacts (MB+ and MB-).
The behaviour of the electromechanical brake is determined by the parameters P280, P281 and P282.
The device checks the brake during operation and generates the following messages in the event of a
fault:
Short circuit at the brake connection 
E004.5
Coil resistance 
E016.5
Release time  E016.6