Bernard Controls SQX TOTAL N31272 Manuel De Mise En Service page 5

sure not to degrade the gaskets while closing the cover. Cable entries shall provide a level of protection
equal or higher than the one indicated on the actuator identification plate. The user shall ensure a regular
cleaning of the product housing to avoid dust build-up.
Overheating
A motor thermal protection switch (refer to actuator electric diagram) is located in the motor. It has
to be integrated into the control circuit in order to switch off the motor power supply in case of
overheating conditions. This protection is mandatory to respect maximum surface temperatures.
Cable entries
Check that cable glands are used and wiring done according to the explosion-proof equipment standards ;
take a special care of the compatibility between the cable diameter and the cable gland size. If one
of the cable entries is not used, seal it with a certified metal plug and without adapter. If an adapter
is necessary to fit a cable gland, only one is allowed by cable entry and shall be a certified one.
The actuator is delivered with a yellow sticker in the connection compartment, that obstruates the cable
entries. The danger symbol and a notice warns the installer of the obligation to equip each cable entry
with a certified plug or cable gland.
For cable gland and plug take care of the marking:
ATEX : Exd (or Exe in case of an increased safety « e » connexion
compartment)
IECEx : Exd (or Exe in case of an increased safety « e » connexion
compartment)
IEx : Brazilian certification Exd.
For Exd box, the thread type is indicated in the connection
box to avoid confusion (NPT or ISO). If the ambiant
(fig. 1)
temperature exceeds 60°C, consider an additional 10°C at the
Terminal compartment with double double-
cable entry. I.e, at a maximum ambiant temperature of 70°C, the
sealing protection and volume < 2 litres.
temperature at the cable entry will be 80°C.
Wiring
Maximum acceptable voltage for the power supply terminal (M4) is 690V and 160V for control terminals
unless otherwise specified on the wiring diagram. Connection is done with isolated and crimped ring tongue
terminals. The maximum cable section is 6mm² for the power supply (M4) and 4mm² for controls (M3).
There are 3 configurations for external
earth terminal according to wires sec-
tion: up to 4mm² for stranded and 6mm²
for single wires; from 6 to 10mm² wires
using a tubular ring lug; above 10 mm²
and up to 70 mm² on request.
< 4 mm² - stranded
> 6 to 10 mm² (remove > 10 mm² to 70 mm²
< 6 mm² - single
the clamp on the terminal)
Make sure to wire both internal and external groundings.
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