Yaskawa GPD503 Drive - Manual (Page 83)

2.30 THERMAL MOTOR OVERLOAD PROTECTION
Sn-14: Protective Characteristics Select 5 Factory Setting : 0000
(Motor Protection)
The GPD 503 Electronic Thermal Overload function meets standards set by UL and CSA
for thermal motor overload protection.
Data: — X X X 0 = Electronic thermal motor protection enabled
— X X X 1 = Electronic thermal motor protection disabled
— X X 0 X = Electronic thermal protection for variable torque
— X X 1 X = Electronic thermal protection for constant torque
— X 0 X X = Short time rating disabled
— X 1 X X = Electronic thermal protection - short time rating enabled
— 0 X X X = Drive protection ( oL2 ) operates at 150% for one minute
— 1 X X X = Drive protection ( oL2 ) operates at 125% for one minute
The motor protection characteristics determine whether electronic thermal motor
protection is enabled or disabled, what type of load it is for, and how the GPD 503 will
react after motor overload is detected. The thermal overload trip point is the motor rated
current value in Cn-09; see Table A3-1 for factory setting.
Electronic thermal overload is a software routine which monitors and protects the motor
from an overtemperature condition over time.
The two considerations of the electronic overload routine are drive output current and
time. Thus, the electronic overload trip curve is as shown at right.
There are in fact two overload fault conditions which the GPD 503 can detect, electronic
thermal overload (OL1) and output overload (OL2). In reality, the GPD 503 will never
output more than 200% rated output current without the output overload (OL2) tripping.
* Only selected versions make adjustment with this digit:
230V 40HP (CT) and above
460V 75HP (CT) and above
575V 30HP (CT) and above
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