GE Industrial Solutions AF-300C AC Drive - Manual (Page 77)

GEK-85716
Function A Automatic Energy Saving Oper.
When automatic energy saving operation is se-
lected, voltage is reduced as shown. The voltage is
decreased as the load current decreases.
0
= Active
= Inactive
voltage
Function 1 b Electronic Thermal Overload
I
Electronic thermal setting should be made with the
following equation:
Electronic Thermal Overload =
Rated electric motor current x 100%
Rated inverter current
--When using a 4 pole, 3 phase motor, the motor
can be protected from overload without an exter-
nal thermal relay.
-- The electronic thermal calculation compensates
for a decrease in motor cooling at low speed .
--When using one inverter with more than one
motor, an external thermal overload relay should
be used for each motor.
-- lfthe Function is not used, set
at 0%.
CAUTION: The electronic thermal overload
meets the reauirements of standard
motors onlv. When anv of the followina conditions
exist, use conventional overload
instead of
the electronic overload built into the inverter.
-- Motors other than
Special motors (anv non-standard motor).
For a
where two or more motors
are run a inverter.
-- has frequent
-- Operation is at Hz or less.
3 0 %
Threshold Where Timing Begins Based
On Output Frequency And Current,
And Electronic Thermal Overload Setting
Time
Before
Trip
(Min.)
Output Current
Inverse Time Characteristic with
Electronic Thermal Overload = 105%
6-3