110/230V~
Live
Motor
Live
Motor
Neutral
Supply
Live
Supply
Neutral
Earth/Ground
Earth/Ground
Neutral
Earth/Ground
Main
winding
Auxiliary
winding
Motor connected for
Capacitor Start - Run
Run
Cap
Start
Cap
Connect Start Capacitor
to Supply live for
High Torque or Heavy starting
Centrifugal or voltage
switch controls
start Capacitor
N
L
M
M
N
L
WIRING
The soft starter is normally inserted into the circuit between the motor and whatever switchgear
is normally used for isolation or switching. The unit can also be fitted before switchgear so that
it can be installed in the supply to equipment which has it’s own mechanical control.
This feature allows for easy installation on equipment such as refrigeration where the need to
disturb internal wiring is avoided.
Operation
Set the ramp time potentiometer to midway to approx 2 seconds and start the system. If the
motor turns instantly when the soft starter is energised and accelerates satisfactorily then no
further adjustment is required. If the rate of acceleration is too great stop the unit and turn the
ramp time potentiometer clockwise then restart. Adjust anti–clockwise for a shorter ramp time
setting to increase the rate of acceleration. The motor should turn instantly when the soft
starter is energised. If not, rearrange the connection of the starting capacitor as shown in fig 1
The terminations are made with industry standard cage clamp screw terminals directly onto the
circuit board on all units.
The incoming power supply is connected to the terminals marked ‘L’ and ‘N’. For EMC compli-
ance it is important that the line circuit is connected to L and the neutral circuit to N. Outgoing
connections from the HFE are taken from the terminals marked ‘L
M
’ and ‘N
M
’ to the motor or
load input terminals (see diagram). Ensure that a good connection is made to the earth termi-
nals provided.
Fuses or other type of short-circuit protection are required for protection against a cable or
motor terminal box fault. These must be fitted externally and on the supply side of the unit. See
“Specifications” section for recommended fuse type and cut-out device.
Typical connection
for the HFE.
Extra starting torque
may be needed for
loads which have a
particularly ‘sticky’
starting characteristic.
This can be achieved by
rearranging the internal
connection of the
starting capacitor,
bringing the connection
out and to the supply
side of the starter as
shown.
