Delta VFD11AMS21AFSHA, User Manual

Page: 234 / 445

Chapter 12 Description of Parameter Settings

MS300 (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
1 00
2 5 50 10 0 1 50
Motor rated
frequenc y %
75
125
Motor rated
current %
Motor cooling curve with shaf t-fixed fan
25 5 0 10 0 1 50
4 0
2 0
6 0
8 0
10 0
Motor rated
current %
Motor rated
frequenc y %
Mot or coo ling curve wit h indepen dent 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
1 00
150
0
250
300
F= 50Hz
F= 40Hz
F= 20Hz
450
350
4 00
500
5 50
6 00
12 24 36 48 60 72 84 96
10
8
12
0
13
2
14
4
15
6
16
8
18
0
19
2
Operatio n time
(sec.)
Motor l oadin g 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.