4 Application conditions
4.1 General
Danger to life and high material damage by
improper handling! Explosion hazard!
● To ensure explosion protection, do not use any purging devices other
than those having an Ex protection class corresponding to the motor or
a higher class (see chapter 7.3 "Ex-p control device for motor purging"
on page 29).
● The values indicated on the identification label (see "Additional identifi‐
cation label with details on motor purging" on page 26) for the purge
gas volume, purge gas, initial pressure, overpressure, etc. must be en‐
sured and monitored by the purging device.
Connection specifications
The motors may only be operated with Bosch Rexroth drive controllers and
connection cables of the IndraDrive series. Controllers from other manufac‐
turers are not allowed. The plug-in terminals must be tightly screwed in the
terminal box. Do not disconnect or connect energized connectors in explosive
atmospheres due to the danger of sparking!
Grounding
Speed-controlled drive systems contain unavoidable leakage current via
ground. For this reason, the motors must be grounded according to
EN 60079-0:2009, chapter 15.3 via the motor cable and via a second sepa‐
rate ground conductor with a cross section of at least 4 mm² (MAF225C-0150
with at least 25 mm²). Prior to commissioning, the protective conductor con‐
nections must be checked for proper connection and firm seating.
Incorporate regular checks of the protective conductor connec‐
tions in the machine maintenance plan.
If the protective conductor in the motor cable and the second separate pro‐
tective conductor at the motor housing have not been connected or have
been interrupted by corrosion and other defects during their service life, the
discharge current flows as leakage current over conducting housing parts.
This must be prevented using the above-mentioned measures (Directive
2014/34/EU, appendix II, chapters 1.2.3 and 1.3.3, 1.4).
Risks of corrosion
Corrosion at the motor housing by aggressive substances (such as certain
coolants, lubricants, cutting oils or salt mists) must be prevented.
Emergency stop
Accumulated energy in the drive controller must be dispersed or isolated as
quickly as possible when the emergency shutdown system is actuated, so
that the risk of an effect into the danger zone is reduced in the event of a fail‐
ure. (Directive 2014/34/EU, appendix II, chapter 1.6.2)
The following options exist for activating the emergency shutdown system:
● Dispersing the energy via DC bus short-circuit
● Isolation of the energies before they are transferred into the potentially
explosive atmosphere by isolating the voltage of the lines and motors
present in the potentially explosive atmosphere.
Pressure loss / temperature rise
In the case of an impermissible pressure loss or temperature rise in the motor
during operation, switch off all poles of the motor. Please also observe the in‐
formation provided in the documentations of the motor controller and the Ex p
control device.
DOK-MOTOR*-IDYN*A*EXPD-IB05-EN-P Bosch Rexroth AG 19/69
Rexroth MAD and MAF Motors in EX px d Design acc. to ATEX Directive 2014/34/EU
Application conditions
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