Chapter 12 Description of Parameter SettingsMS300 (High Speed Model)
12-06-7
This parameter is to set the action time of electronic thermal relay. It works based on the I2t
characteristic curve of electronic thermal relay, output frequency and current of drive, and
operation time to prevent motor from overheating.
40
20
60
80
100
2 5 50 10 0 1 50
Motor rated
frequency %
75
125
M
ed
current %
Motor rated
frequency %
Motor cooling curve with independent fan
125
75
The action of electronic thermal relay depends on the setting of Pr. 06-13 and Pr. 06-27.
1. Pr. 06-13 or Pr. 06-27 is set 0 (using inverter motor):
When output current of drive is higher than 150 % of motor rated current (refer to motor
cooling curve with independent fan), the drive will start to count the time. Electronic thermal
relay will act when the accumulated time exceeds Pr. 06-14 or Pr. 06-28.
2. Pr. 06-13 or Pr. 06-27 is set 0 (using standard motor):
When output current of the drive is higher than 150 % of motor rated current (refer to motor
cooling curve with shaft-fixed fan), the drive will start to count the time. Electronic thermal
relay will act when the accumulated time exceeds Pr. 06-14 or Pr. 06-28.
The actual electronic thermal relay action time will adjust according to drive output current
(shown as motor loading rate %). The action time is short when the current is high, and the
action time is long when the current is low. Please refer to the following chart:
50
200
100
150
0
250
300
F=50Hz
F=40Hz
F=20Hz
450
350
400
500
550
600
12
24
36
48
60
72
84
96
108
120
132
144
156
168
180
192
Operation time
(sec.)
Motor loading ra te
(%)
Temperature Level Over-heat (OH) Warning
Factory Setting: 105.0
Settings 0.0~110.0
o
C
If the set value is increased to 110
o
C, when the IGBT temperature of the drive reaches 110
o
C in
operation, there will be no warning, the drive will display error directly and stop.
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