Delta MS300 Series User Manual page 346

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
When Pr. 14-74 or Pr. 14-77 setting is 2 or 4, drive will display ot3 / ot4 error when over-torque
detection and drive will stop operation, it will operate by manual reset.
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
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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.
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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.
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Over-torque
detection level
14-75 (14-78)
14-75 (14-78)*95 %
Multi-function
output terminal
= 73 or 74
Over-torque
detection level
14-75 (14-78)
Output current
Multi-function
output terminal
= 73 or 74
Electronic Thermal Relay Selection 3 (Motor 3)
Electronic Thermal Relay Selection 4 (Motor 4)
Settings 0: Inverter motor (with external forced cooling)
1: Standard motor (motor with fan on the shaft)
2: Disabled
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Chapter 12 Description of Parameter SettingsMS300
Output current
Over-torque
detection time
14-76 (14-79)
Over-torque
detection time
14-76 (14-79)
12.1-14-5
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Manual reset
Manual reset
Factory Setting:
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