Delta CFP2000 Series User Manual page 344

 When you set Pr.06-06 or Pr.06-09 to 1 or 3, an ot1/ot2 warning displays while the drive keeps
running. The warning remains on until the output current is smaller than 5% of the over-torque
detection level.
 When you set Pr.06-06 or Pr.06-09 to 2 or 4, an ot1 / ot2 warning displays and the drive stops
running after over-torque detection. The drive keeps running after you manually reset it.
Electronic Thermal Relay Selection (Motor 1)

Electronic Thermal Relay Selection (Motor 2)

Settings
 Prevents self-cooled motor from overheating under low speed. Use an electronic thermal relay to
limit the drive's output power.
 Setting the parameter to 0 is suitable for an inverter motor (motor fan using independent power
supply). For this kind of motor, there is no significant correlation between cooling capacity and
motor speed. Therefore, the action of electronic thermal relays remains stable in low speed to
ensure the load capability of the motor in low speed.
 Setting the parameter to 1 is suitable for standard motor (motor fan is fixed on the rotor shaft). For
this kind of motor, the cooling capacity is lower in low speed; therefore, the action of electronic
thermal relay reduces the action time to ensure the life of motor.
 When the power is cycled frequently, if the power is switched OFF, the electronic thermal relay
protection is reset; therefore, even setting the parameter to 0 or 1 may not protect the motor well.
If there are several motors connected to one drive, install an electronic thermal relay in each
motor.
0: Inverter motor (with external forced cooling)
1: Standard motor (motor with fan on the shaft)
2: Disable
12.1-06-8
Chapter 12 Description of Parameter SettingsCFP2000
Default: 2