Thermal overload protection -34, Ol 1 – Yaskawa J7 Drive User Manual

Page 69

5-34

n32 :

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 0% and 120% 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

n32

to " 0.0 " disables the motor overload protection

function, regardless of the setting of

n33

n34

n33

: Electronic Thermal Motor Protection

Factory setting:

Range: 0 to 2

Setting Electronic Thermal Characteristics

General Purpose Motor with limited speed range

Special Purpose Motor with wide speed range (10.1 or greater)

Electronic thermal overload protection disabled

n34 :

Electronic Thermal Overload Protection

Factory setting:

Time Constant

Range: 1 to 60 min.

This parameter sets the electronic thermal overload relay protection time 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 estimates 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
provided n33 = 2. When operating several motors with one Drive, install a thermal overload relay on
each motor and disable the Drive's Motor Protection by setting n33 = 2.

5.24 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)

100

TORQUE

(%)

140

155

180

3 20

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.

100