Delta VFD11AMS21AFSHA, User Manual

Page: 285 / 445

Chapter 12 Description of Parameter Settings

MS300 (High Speed Model)
12-14-5
M anual reset
Ma nual reset
Output cu rrent
Over-torque
de tection level
14-75 (14 -78)
M ulti-function
output terminal
= 73 or 74
Over-torque
detectio n tim e
14-76 (14-7 9)

Electronic Thermal Relay Selection 3 (Motor 3)

Electronic Thermal Relay Selection 4 (Motor 4)
Factory Setting:
2
Settings 0: Inverter motor (with external forced cooling)
1: Standard motor (motor with fan on the shaft)
2: Disabled

In order to prevent the self-cooling motor occurs motor overheating during low speed operation,
users can set the electronic thermal relay to limit the drive output power allowable.

The setting 0 is suitable for inverter motor (with external forced cooling). There is no obvious
correlation between the heat dissipation capability and speed of motor, so the low speed
electronic thermal relay is fixed, it can ensure that the load capacity of the motor at low speed.

The setting 1 is suitable for standard motor (motor with fan on the shaft). The cooling capacity of
motor is poor at low speed, so the electronic thermal relay action time will be appropriate to
reduce, it can ensure the life of the motor.

When power ON/OFF uses frequently, the thermal relay protection will be reset when power
OFF, so even if the setting is 0 or 1, it may not be protected. If there are several motors
connected to a drive, please install the electronic thermal relay in each of motors.

Electronic Thermal Relay Action Time 3 (Motor 3)

Electronic Thermal Relay Action Time 4 (Motor 4)
Factory Setting: 60.0
Settings 30.0~600.0 sec.

Electronic thermal relay is according to the motor 150 % rated current value and with Pr. 14-81
settings, the settings of Pr. 14-83 is to protect the motor to avoid burned due to motor
overheating. When it reaches the setting time, the drive will display "EoL3 / EoL4", and the
motor will be free run to stop.

This parameter function is based on the operating characteristic curve of electronic thermal
relay I2t, it is according to the drive output frequency, current and running time to protect the
motor and prevent the overheating of motor.