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Easy-Start ES Instruction Manual
Operation
SECTION 3
3-12
DIP Switch Settings
7.
Current Trip
- The current trip is adjustable
from 100 to 120% of the DIP switch current
setting.
It is active all the time; during start and run.
The maximum setting is at the full clockwise
position.
This adjustment is used to accommodate the
service factor rating of the motor. For
example, for a service factor of 115%, the
control should be set to 3/4 clockwise.
The current trip adjustment will affect the
entire overload trip-time curve. (See Figure
3-1.)
Notice
-
The
Cur Trip
is factory set to
approximately 100%.
8. The following adjustments are done at the
factory:
A.
MIN
volts
B.
MAX
volts
C.
STAB
A.
Minimum volts
is set to 50% of line
voltage. This adjustment should only be
made with DS3-2
OPEN
.
Example:
The motor volts is set to 240
volts when running from a 480V power
line. This is done at the factory with the
motor running at no load.
It is important to note that the voltage
applied to the motor by the Easy-Start ES
is entirely dependent on the motor load.
For example, take the extreme case when
the motor is running at 100% of rated
load; the motor voltage should not be
reduced since it could cause the motor to
overheat due to excessive current.
The Easy-Start ES automatically adjusts
the motor voltage to the value necessary
to maintain normal operation at the most
efficient energy usage. If the motor
voltage is not as low as it was expected to
be, it is most likely that the motor is not
fully unloaded.
Notice
- The factory setting of 50%
should be satisfactory for the majority of
applications.
B. The maximum volts is set at the factory
for 100% motor voltage at 100% motor
load.
Notice
- This factory setting does not
normally require readjustment.
The
MIN VOLTS
adjustment must be
made first, before attempting to adjust the
MAX VOLTS
.
Here is a procedure that can be followed
if it becomes necessary to adjust the max
volts:
This adjustment should only be made with
DS3-2
OPEN
. Connect a voltmeter to the
line side and another voltmeter to the load
side of the starter. Use an ammeter to
monitor the motor current. Increase the
motor load to 100% of rating by observing
when the motor current reaches its FLA
rating; adjust the
MAX VOLTS
until the
motor voltage is nearly equal to the line
voltage. There will be approximately a
one or two volt loss in the power
semiconductors.
Notice
- Maximum volts adjustment is
to optimize energy savings and will not
protect starter against abnormally high
line voltages.
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