NORD Drivesystems B1901 - Manual (Page 2)

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Operating and assembly instructions spring-loaded brake FDW – ATEX
General information and instructions:
The dust-protected spring-loaded brakes are suited for the use in zone 22 (non-
conducting dust) and conform with the building regulations of device group װ, category 3D as
per DIN 50 014 and DIN 50 281-1-1.
Dust deposits must not exceed 5 mm.
Ambient temperature -20 °C to +40 °C
Under the prescribed and established operating conditions the surface temperature of the
spring-loaded brake will not exceed 125 °C – refer to technical data on page 4.
In order to warrant the max. admissible surface temperature, the spring-loaded brakes are
equipped with a PTC thermistor detector (100 °C) (resistance < 100 Ohm at 20°C).
In case of a malfunction, motor and brake have to be isolated from the power system through a
commercial tripping unit.
The operator is responsible for controlling and testing the protective equipment
as to its efficiency.
Prior to commissioning, an evidence of the efficiency of the protective
equipment is required.
The designation is as follows:
CE Ex ll 3D T 125 °C for zone 22 (non-conducting dust)
The brake must not be opened for inspection in an explosive atmosphere.
Prior to opening, always switch off the voltage and secure it against an accidental reclosure.
Spring-loaded brakes are suited to be connected with three-phase a.c. motors.
In case of voltage-operated three-phase a.c. motors, the operator has to warrant and care for a
ventilation of the brake.
External measures and actions have to safeguard that the braking command is simultaneously
given with switching off the motor.
The spring-loaded brake is a component of a device and/or of a machine and earthing
arrangements have to be made there.