Electronic Thermal Characteristic - Delta VFD-E User Manual

06.07

Electronic Thermal Characteristic

Settings
The parameter determines the time required for activating the I
function by the output frequency/current of the AC motor drive and operation time to prevent
motor from overheating.
The electronic thermal overload relay acts by Pr.06.06 setting:
1. Pr.06.06 is set to 0(Operate with a Standard Motor (self-cooled by fan)): when the output
current is greater than (Pr.07.00 Motor Rated Current (Motor 0)X (the corresponding motor
rated current % of motor rated frequency in standard motor figure in Pr.06.06) X150%), the AC
motor drive will start to count time. When accumulated time exceeds Pr.06.07(Electronic
Thermal Characteristic) setting, the electronic thermal overload relay protection (OL1) will be
ON.
2. Pr.06.06 is set to 1(Operate with a Special Motor (forced external cooling)): when the output
current is greater than (Pr.07.00 Motor Rated Current (Motor 0)X (the corresponding motor
rated current % of motor rated frequency in special motor figure in Pr.06.06) X150%), the AC
motor drive will start to count time. When accumulated time exceeds Pr.06.07(Electronic
Thermal Characteristic) setting, the electronic thermal overload relay protection (OL1) will be
ON.
The actual action time of electronic thermal characteristic will be adjusted by the output current
of the AC motor drive (motor load rate %). For large current, it needs short time to activate the
2
I t electronic thermal protection function. For small current, it needs long time to activate the I
electronic thermal protection function as shown in the following figure.
Related parameters: Pr.06.06(Electronic Thermal Overload Relay Selection) and
Pr,07.00(Motor Rated Current (Motor 0))
NOTE
Please refer to Pr.06.06(Electronic Thermal Overload Relay Selection (OL1)) for curve figure of
standard motor and special motor.
Revision Jan. 2009, 06EE, SW--PW V1.12/CTL V2.12
30 to 600 sec
Chapter 4 Parameters|
Factory Setting: 60
2
t electronic thermal protection
Unit: 1
2
t
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