Chapter 12 Description of Parameter SettingsCP2000
12.1-06-9
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 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 motor from overheating.
The action of electronic thermal relay depends on the setting for Pr.06-13 and Pr.06-27.
1. Pr.06-13 or Pr.06-27 set to 0 (using inverter motor)：
When the output current of motor drive is higher than 150% of motor rated current (refer to the
motor cooling curve with independent fan), motor drive starts to count the time. The electronic
thermal relay acts when the accumulated time exceeds Pr.06-14 or 06-28.
2. Pr.06-13 or Pr.06-27 set to 1 (using standard motor)：
When the output current of the drive is higher than 150% of the motor rated current (refer to
the motor cooling curve with shaft-fixed fan), the drive starts to count the time. The electronic
thermal relay acts when the accumulated time exceeds Pr.06-14 or 06-28
3. If the Pr.05-01 is not set, the default is 90% of Pr.00-01 rated current of the drive.
The actual electronic thermal relay action time adjusts according to the drive output current
(shown as the motor loading rate %). The action time is short when the current is high, and the
action time is long when the current is low. Refer to following chart: (The motor cooling curve with
shaft-fixed fan and motor cooling curve with independent fan F = 50 Hz are the same one.)
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