Yaskawa V7 Drives - Manual (Page 90)

n036 : Motor Rated Current Factory setting: See Table A3-1
Range: see description
This parameter should be set, in increments of 0.1 A, to the rated current (FLA) value shown on the motor
nameplate; this value MUST BE between 10% and 150% of the
drive rated current. If the motor FLA does not
fall within this range, a different Model No. drive must be used.
NOTE: Setting n036 to " 0.0 " disables the motor overload protection
function, regardless of the setting of n037 or n038.
n037 : Electronic Thermal Motor Protection
Factory setting: 0
Range: 0 to 2
Setting Electronic Thermal Characteristics
0 Short term rating
1 Standard rating
2 Electronic thermal overload protection disabled
n038 : Electronic Thermal Overload Protection Factory setting: 8
Time Constant
Range: 1 to 60 min.
This parameter sets the electronic thermal overload relay protection time when when 150% of overload is
applied after the motor is operated continuously at rated current.
The Drive protects against motor overload with a UL-recognized, built-in electronic thermal overload relay.
The electronic thermal overload function monitors motor temperature, based on drive output current and time,
to protect the motor from overheating. When the electronic thermal overload trips, an
“ oL1 ” error occurs, shutting OFF the drive output and preventing excessive overheating of the motor.
When operating with one drive connected to only one motor, an external thermal relay is not needed. When
operating several motors with one drive, install a thermal overload relay on each motor.
5.25 THERMAL OVERLOAD PROTECTION
Electronic Thermal
Cooling Effect Current Characteristics Overload
Effective when
operated at 60Hz
from a commercial
power supply “ oL 1 ” error (motor
overload protection)
occurs when
continuously operated
at less than 60Hz at
100% load.
Base Frequency
60Hz
(V/f for 60Hz,
230V Input Voltage)
0
38
55
80
100 TORQUE
(%)
140
155
180
3 20 60 120
60 SEC
SHORT TERM
CONTINUOUS
RATING
OPERATION FREQUENCY (Hz)
Effective when
operated at low
speed (approx. 6Hz) Electronic thermal
overload protection not
activated even when
continuously operated
at less than 60Hz at
100% load.
0
38
55
100 TORQUE
(%)
150
180
6 60 120
OPERATION FREQUENCY (Hz)
60 SEC
SHORT TERM
CONTINUOUS
RATING
Shor
t T
er
m
Rating
Standard Rating
Base Frequency
60Hz
(V/f for 60Hz,
230V Input Voltage)
5-38