sepam 20 user manual - Schneider Electric

6
Installation Voltage transformers
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DANGER
HAZARD OF ELECTRIC SHOCK, ELECTRIC
ARC OR BURNS
b Only qualified personnel should install this
equipment. Such work should be performed only
after reading this entire set of instructions and
checking the technical characteristics of the
device.
b NEVER work alone.
b Turn off all power supplying this equipment
before working on or inside it. Consider all
sources of power, including the possibility of
backfeeding.
b Always use a properly rated voltage sensing
device to confirm that all power is off.
b Start by connecting the device to the
protective earth and to the functional earth.
b Screw tight all terminals, even those not in
use.
Failure to follow these instructions will result
in death or serious injury.
DE50565
The phase and residual voltage transformer secondary circuits are connected to the
CCT640 connector, item B on B2X type Sepam units.
CCT640 connector
The connector contains 4 transformers which provide impedance matching and
isolation between the VTs and Sepam input circuits.
Terminals B1 to B6 are intended for phase voltage measurement (1) , and B7 and B8
for residual voltage measurement (case shown, not connected if obtained by the sum
of the 3 phase voltages).
(1) 1, 2 or 3 VTs (case shown).
Installation of the CCT640 connector
1. Insert the connector pins into the slots on the base unit.
2. Flatten the connector against the unit to plug it into the 9-pin SUB-D connector
(principle similar to that of the MES module).
3. Tighten the mounting screw .
Connection
b The connections are made to the screw type connectors that can be accessed on
the rear of the CCT640 (item )
b Wiring with no fittings:
v 1 wire with maximum cross-section of 0.2 to 2.5 mm2 (AWG 24-12) or 2 wires with
maximum cross-section of 0.2 to 1 mm2 (AWG 24-18)
v stripped length: 8 to 10 mm (0.315 to 0.39 in)
b Wiring with fittings:
v recommended wiring with Telemecanique fitting:
- DZ5CE015D for 1 wire 1.5 mm2 (AWG 16)
- DZ5CE025D for 1 wire 2.5 mm2 (AWG 12)
- AZ5DE010D for 2 wires 1 mm2 1
2
3
(AWG 18)
v tube length: 8.2 mm (0.32 in)
v stripped length: 8 mm (0.31 in)
b The CCT640 must be earthed (by green/yellow wire + ring lug) on the screw 4
(safety measure in case the CCT640 becomes unplugged).
DE52152
MT10514
PCRED301005EN - 06/2008
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