Delta Electronics AC Motor Drive VFD-E - Manual (Page 146)

Chapter 4 Parameters|
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 4-93
This parameter sets the time for how long over-torque must be detected before “OL2” is
displayed.
06.06 Electronic Thermal Overload Relay Selection (OL1)
Factory Setting: 2
Settings 0 Operate with a Standard Motor (self-cooled by fan)
1 Operate with a Special Motor (forced external cooling)
2 Operation disabled
This function is used to protect the motor from overloading or overheating.
40
20
60
80
100
25 50 100 150
rated frequency of the motor %
ra
te
d
c
u
rre
n
t o
f t
h
e
m
o
to
r%
Standard motor
(self-cooled by fan)
rated frequency of the motor %
ra
te
d c
u
rr
e
n
t o
f th
e m
o
to
r%
Special Motor
(forced external cooling)
25 50 100 150
40
20
60
80
100
06.07 Electronic Thermal Characteristic Unit: 1
Settings 30 to 600 sec Factory Setting: 60
The parameter determines the time required for activating the I 2 t electronic thermal protection
function. The graph below shows I 2 t curves for 150% output power for 1 minute.
350
50Hz or more
10Hz
5Hz
0 50 100 150 250 200
300
250
200
150
100
50
Operation
time (seconds)
Load
factor (%)