Connecting The Power Supply; Housing Closure - Videotec EXH Manuel D'instructions

6.7 Connecting the power supply

Electrical connections must be performed
with the power supply disconnected and
the circuit-breaker open.
When commencing installation make sure
that the specifications for the power supply
for the installation correspond with those
required by the device.
Check that the power supply socket and
cable are adequately dimensioned.
CONNECTING THE POWER SUPPLY
Power supply 24Vac or 230Vac
Terminals
~/+
~/-
Tab. 4
Nominal section of the cables used:
• Compact conductor (solid): from 0.2mm²
up to 2.5mm² (from 30AWG up to
11AWG).
• Multi-stranded conductor (stranded):
from 0.2mm² up to 4mm² (from 30AWG
up to 11AWG).
MNVCEXH_2104_EN
Position
19
20
16

6.8 Housing closure

Test system operation for positive results
before closing the product and allowing the
presence of a hazardous atmosphere.
During opening and closure operations of
the product, pay attention not to damage
the flameproof joint.
Before closing the front cover, check the
O-ring gasket is intact. If the sealing is
damaged replace it with the one supplied.
Insert the rear flange if the housing body having
aligned holes in between the two parts.
Be very careful not to damage the O-ring
gasket.
Before closing, check the connection of the 4
earthing cables (front flange, rear flange, housing
body, housing board). Ensure that the earthing cables
are placed at the same potential.
Screw back the previously removed screws.
Screws properties:
• Diameter/Screw pitch: M6x1
• Material: A2 or A4
• Screw head: ISO 4762
• Length: 25mm
• Yield stress (min): 700N/mm²
Pay attention to the fixing. Tightening
torque: 12.5Nm.
Tighten the screws (2 or 3 rotations at a time per
screw) following the cross tightening sequence
illustrated in the figure.
12 1
8 5
4
10
6 7
2 11
Fig. 11
12 1
8
9 4
3
10
6
2 11
5
9
3
7
15