Installing the Converter 3-7
590D DC Digital Converter - HA467078
Power Wiring Connections
WARNING!
Power terminals carry electrical voltage which can be lethal. Never work on any
control equipment or motors without first removing all power supplies from the
equipment.
3-Phase Contactor (D5, D6)
A 3-phase contactor should be connected in the
main ac power supply connections with a
rating suitable (AC1) for the controller
concerned.
The contactor does not switch current and is
primarily for disconnection and sequencing of
the power bridge. The main contactor must be
energised directly from the controller by
connecting the coil to terminals D5 (Line) and
D6 (Neutral). No additional series contacts or
switches are permitted since they will interfere
with the sequencing of the controller and
cause unreliability and possible failure.
Note:
If the 3-phase contactor has a coil with an
inrush greater than 3A, a slave relay must
be used to drive the contactor coil. The
contactor and slave relay (if required) must
have coil voltages compatible with the
controller auxiliary supply voltage.
A dc contactor can be used but the sequencing must be adjusted to accommodate its
use, an auxiliary normally open volt-free contact of the contactor must be connected in
series with the "enable" input C5 to disable the drive until after the contactor is closed.
3-Phase Supply, AC Line Choke (L1, L2, L3)
The main ac power is connected to busbar terminals L1, L2 and L3, there
is no specific phase connection to these three terminals as the controller is
phase rotation independent. The connections must be made via the correct
high speed semiconductor fuses, the main
contactor and the ac line choke.
IMPORTANT: If a motor becomes completely short-circuited,
the current trip (OVER I TRIP) will not protect
the Converter. Always provide high-speed
thyristor fusing to protect the thyristor stack in
the case of direct output short circuits.
Fit a 3-phase ac line choke in series with the incoming
main 3-phase ac power supply. (Parker SSD
Drives stock a series of chokes suitable for this
duty, mechanically designed to connect directly to
the controller ac supply terminals.) The choke
should be connected between the controller and
the ac contactor for optimum protection and safety
(refer to drawing HG386828C).
The choice of ac or dc contactors is a user preference.
Parker SSD Drives prefers ac contactors as they isolate the converter and motor when not in use.
The only restriction on the use of a dc contactor is that an interlocking contact should be
provided into the Enable input.
2
MINIMUM
CONNECTION
REQUIREMENT
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