2 Engineering
2.9 Three-phase motors
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
49
2.9.6 Connecting EX motors
The following aspects must be taken into account when connecting hazar-
dous location motors:
•
A DB1 variable frequency drive can be installed in an Ex housing within
an Ex area or in a control panel outside of the Ex area.
•
All applicable industry-specific and country-specific regulations for hazar-
dous locations (ATEX 100a) must be complied with.
•
The specifications and instructions provided by the motor’s manufactu-
rer with regard to operation with a variable frequency drive – e.g.,
whether motor reactors (dV/dt limiting) are required – must be taken into
account.
•
Temperature sensors in the motor windings (thermistor, Thermo-Click)
must not be connected directly to the variable frequency drive, but
instead must be connected through a relay approved for the Ex area
(e.g. EMT6).