Purge Gas Connection - Bosch Rexroth MAD Operating Instruction

50/69 Bosch Rexroth AG
Connection system
9.9

Purge gas connection

Rexroth MAD and MAF Motors in EX px d Design acc. to ATEX Directive 2014/34/EU
Both purge gas ducts are connected at the appropriate thread at the motor.
The connection threads are factory-made closed with protective plugs. Re‐
move the protective plugs just before assembly.
When connecting the purge gas ducts heed the prescribed flow directions:
● Inlet (IN) is done via the purge gas hole on the terminal box.
● Outlet (OUT) is done via the purge gas hole on the motor housing.
① Purge gas hole on the motor housing (OUT)
② Purge gas hole on the terminal box (IN)
Fig. 9-12: Purge gas connections on the ATEX motor
To connect an ATEX motor with the Ex p control device for motor scavenging
use a pipe or tube with a maximum inner diameter of 8 mm.
When using a plastic pipe, the maximum outer diameter is 13 mm.
WARNING
Use only plastic tubes which are authorized for use in explosive areas.
Observe the permitted bending radius of the plastic tubes according to
9-13 when connecting the pneumatic scavenging gas ducts.
DOK-MOTOR*-IDYN*A*EXPD-IB05-EN-P
Possible electrostatic discharge of plastic
tubes! Explosion hazard!
Fig.