91 – Pvd3665_Gb_Ex_August 2022
3.8. Power Electrical Connections
3.8.1. Inlet cables for ATEX/IECEx version.
The servomotors EX have two cable glands with metric thread :one for the feedback cable
and the other for the power. These cable glands are place in axial or radial position on the
feedback cover depending the motor option.
The informations of these cable glands are placed in the §4.4.
The cable gland expected for the feedback cable could be replace by an ATEX thread cap
in case of a servomotor in sensorless.
It is forbidden to change a cable gland without the Parker agreement.
3.8.2. Wires sizes
In every country, you must respect all the local electrical installation
regulations and standards.
Not limiting example in France: NFC 15-100 or IEC 60364 as well in Europe.
Cable selection depends on the cable construction, so refer to the cable
technical documentation to choose wire sizes
Some drives have cable limitations or recommendations; please refer to the
drive technical documentation for any further information.
At standstill, the current must be limited at 80% of the low speed current I
o
and cable has to support peak current for a long period. So, if the motor
works at standstill, the current to select wire size is
2 x 0.8 Io 1,13 x I
o
.
For the ATEX installations in ambient temperature of 40°C or 60°C, you
have to use special cables C2 type auto-extinguish regarding the standard
EN 50265-2-1.
Warning : the cables used in the :
• EX3 can reach a temperature of 80°C,
• EX4 can reach a temperature of 91°C,
• EX6 can reach a temperature of 95°C,
• EX8 can reach a temperature of 94°C.
Warning : for a safe use, the EX3 servomotors has to be used with cable
which withstand a maximum temperature of 80°C.
Warning : for a safe use, the EX4/EX6/EX8 servomotors has to be used
with cable which withstand a maximum temperature of 100°C.
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