Pub 49442
© 2002 Eaton Corporation
All Rights Reserved
Printed in USA
Effective 01/02
Short Circuit Protection by Fuses
Type 1
S701X25N3BP — protection max. 80A
g
I/
g
L/
g
G 63A T
Type 2
S701X25N3BP — protection max. I
2
t of the fuse 6300A
2
S
NOTE: S701X25N3BP
— When protected by H class fuses,
this device is rated for use on a circuit capable of
delivering not more than 5000 rms symmetrical
amperes, 600V maximum.
How to Adjust Time and Torque, Figure 10
The Soft Starter will read time and torque settings in the OFF
state. Repeated starts may trip the motor protection relay. DO
NOT set the rotary switches in between positions. This cor-
rupts the time and torque adjustment. Use screwdriver 2 mm x
0.5 mm.
Ramp-Up Time and Initial Torque
Table 8.
Ramp-Up Time and Initial Torque
(Standard Load)
Kick Start/Break Loose
If it is not possible to reach a time sufficient for the application,
it may be necessary to kick start the load.
Table 9.
Kick Start/Break Loose (High Inertia Loads)
Ramp-Down Time
Follow
Table 8
to set
Ramp-Up
and
Initial Torque
.
Table 10.
Ramp-Down Time, e.g. Pump Loads
Figure 10.
Time and Torque Adjustment
Position
Setting/Adjustment
Set the
Ramp-Up
switch to maximum.
Set the
Ramp-Down
switch to minimum.
Set the
Initial Torque
switch to minimum.
Apply control signal for a few seconds. If the load does not
rotate immediately, increment the
Initial Torque
and try
again. Repeat until the load starts to rotate immediately on
startup.
Adjust
Ramp-Up
time to the estimated start time (the
scale is in seconds) and start the motor.
Decrease the
Ramp-Up
time until mechanical surge is
observed during start.
Increase the time one step to eliminate the surge.
Position
Setting/Adjustment
Set the
Ramp-Up
switch to maximum.
Set the
Ramp-Down
switch to minimum.
Set the
Initial Torque
switch to minimum kick
start torque.
Apply control signal for a few seconds. If the load stops
right after the 200ms “kick”, increment the
Initial Torque
and try again. Repeat until the load continues to rotate
after the “kick”.
Adjust
Ramp-Up
time to the desired start time (the scale is
in seconds) and start the motor.
Position
Setting/Adjustment
Set the
Ramp-Down
switch to maximum.
Switch off the control voltage and observe any mechanical
surges on the load. If there are none, decrement
Ramp-
Down
switch and try again. Repeat until mechanical surge
on the load is observed.
Increase the time one step to eliminate the surge.
