Chapter 12 Description of Parameter SettingsC2000
12.1-06-7
Current Limit
Default: 170
Settings 0–250% (100% corresponds to the rated current of the drive)
Sets the maximum output current of the drive. Use Pr.11-17–Pr.11-20 to set the drive’s output
current limit.
When setting the control mode as VF, SVC or VFPG, if the output frequency of the drive reaches
this current limit, the output frequency decreases automatically. It works like the current stall
prevention.
Electronic Thermal Relay Selection (Motor 1)
Electronic Thermal Relay Selection (Motor 2)
Default: 2
Settings 0: Inverter motor (with external forced cooling)
1: Standard motor (motor with fan on the shaft)
2: Disable
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 an 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 an 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.
Electronic Thermal Relay Action Time 1 (Motor 1)
Electronic Thermal Relay Action Time 2 (Motor 2)
Default: 60.0
Settings 30.0–600.0 sec.
Set the parameter to 150% of motor rated current and use with the setting of Pr.06-14 and
Pr.06-28 to prevent motor damage due to overheating. When it reaches the setting, the drive
displays “EoL1 / EoL2”, and the motor free runs to stop.
Use this parameter to set the action time of the electronic thermal relay. It works based on the I
2
t
characteristic curve of electronic thermal relay, the output frequency and current of the drive, and
the operation time to prevent the motor from overheating.
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