RGF 300
16/53
2.0 ELECTRICAL CONNECTIONS
2.1 POWER CARD ELECTRICAL CONNECTIONS
For supply and load connection, reference should be made to the diagrams shown in
fig. 8,
making sure the
section of the cables is adequate to the connected load.
The power cables (supply and load) must be installed separately from the control cables (analogue inputs and
ON-OFF inputs/outputs) keeping the maximum distance possible between the conductors.
Do not place power cables with signal cables in the same raceway. If the cables cross one another,
ensure it is at 90°.
ATTENTION : connect the earth conductor to the screw placed purposely beside the dissipator. Use
heat resistant cables able to withstand temperatures greater than 90°C.
SURGE ARRESTER : electric protection placed between the regulator supply and the earth to protect
the device from transitory mains excess voltage.
ATTENTION : disconnect the PE faston contact from the earth reference, in the '
ELECTRIC
STRENGTH TEST
’.
The
rgf300
regulators allows connection of three-phase loads
without requiring connection of the
NEUTRAL
.
This simplifies installation and facilitates the star or delta load configuration.
It is advisable to provide a by-pass switch to allow load activation even when the cutting regulators is faulty
(
emergency by-pass
).
When connecting the by-pass, the following precautions should be taken into consideration:
i) connection made through the by-pass switch must keep phase correspondence unaltered so as to
avoid destructive shortcircuits and maintain the motor's sense of rotation.
ii) before supplying the load with maximum voltage, supply to the regulator should be disconnected,
therefore:
•
••
•
it is advisable to use a three-position manual switch as a commutation device
•
••
•
if automatic commutation is carried out by means of contactors, make sure there is some delay (at
least 2 seconds) between regulator disconnection and load activation operations.
Electrical connection of the supply and load,
for
rgf300
regulators is shown in
fig. 9
PE
L1
L2
L3
U V W PE R S T
BY-PASS
To Next Page
Loading...
