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Delta VFD-E

Delta VFD-E
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Chapter 4 Parameters|
4-112 Revision Jan. 2009, 06EE, SW--PW V1.12/CTL V2.12
This function is used to protect the motor from overloading or overheating. When the motor
(self-cooled by fan) operates in low frequency, overload is seldom happened. Refer to the
following figure for the application.
When the rated current of motor is less than drive’s or bad design of the motor heat dissipation,
it can use this parameter to limit the output current of the AC motor drive to prevent motor from
overheating or damage.
Setting 0: the electronic thermal relay is used for standard motor(heatsink is fixed on rotor
shaft). When operating in low speed, the motor heat dissipation function will be bad. Thus, it
needs to decrease the action time of the electronic thermal relay to ensure the motor life.
Setting 1: the electron thermal relay is used for special motor(heatsink uses independent
power). The heat dissipation function has no direction relation with rotation speed. Thus, the
electronic thermal relay is still held in low speed to ensure the motor load ability in low speed.
In the frequent power ON/OFF applications, it can’t use this parameter (even set to 0 or 1) for
protection due to this function will be reset once the power is OFF. Thus, it needs to add the
thermal relay on each motor when an AC motor drive is connected with several motors.
Setting 0 or 1: when the electronic thermal relay protection is enabled in low speed operation,
the AC motor drive will display “OL1” and free run to stop. It needs to press “RESET” to clear
the warning message.
Related parameter: Pr.06.07(Electronic Thermal Characteristic)
40
20
60
80
100
25 50
100 150
rated frequency of the motor %
rated current of the motor%
Standard motor
(self-cooled by fan)
rated frequency of the motor %
rated current of the motor%
Special Motor
(forced external cooling)
25 50 100 150
40
20
60
80
100
NOTE
When the standard motor operates in low speed with rated current, the motor overload protection will
occur easily. Thus, please use the special motor when operates in low speed with rated current.
Refer to Appendix C.3 How to choose a suitable motor for motor selection.

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