Lenze 8400 - Manual (Page 256)

Braking operation
Braking operation with external brake resistor
Wiring of brake resistor
8

256 EDS84ASC552 EN 9.1
8.2.6 Wiring of brake resistor
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Danger!
Hazardous electrical voltage
During operation of the standard device and up to 3 minutes after power-off
hazardous electrical voltages may occur at the terminals of the brake resistor.
Possible consequences:
ƒ Death or severe injuries when touching the terminals.
Protective measures:
ƒ Disconnect the standard device from the mains before working on the brake
resistor.
ƒ Check all power terminals for isolation from supply.
ƒ Select the mounting location so that the operating conditions mentioned in
the mounting instructions for the brake resistor are permanently
guaranteed.

Danger!
Hot surface
The brake resistor may get very hot. (For temperatures see the mounting
instructions for the brake resistor.)
Possible consequences:
ƒ
Severe burns when touching the brake resistor.
ƒ Fire or smouldering fire if flammable material is placed near the brake
resistor or may get to it.
Protective measures:
ƒ Before working on the brake resistor, check its surface temperature.
ƒ
Select the mounting location so that the operating conditions mentioned in
the mounting instructions for the brake resistor are permanently
guaranteed.
ƒ Protect the mounting location through fire prevention.
Protect the brake resistor and controller against destruction caused by overload:
ƒ Establish a safety shutdown using the thermostat of the brake resistor to disconnect
the controller from the mains.
Connecting cable version
ƒ up to 0.5 m: twisted and unshielded
ƒ from 0.5 to 5 m: shielded
– Use shielded cables to meet the EMC requirements.