Group 70 — Protective Functions
MVX9000 User Manual 5-57
Descriptions of
Parameter Settings
Figure 5-49: I
2
t Curves
70.08
Electronic Thermal
Motor Overload
Range: 30 to 300 seconds Default: 60 sec
Unit: 1 seconds
This parameter can be set during operation.
The parameter determines the time required to activate the I
2
t
electronic thermal motor overload function. Figure 5-49
shows I
2
t curves for 150% output power for 1 minute.
70.09
Auto Voltage
Regulation (AVR)
Range: Default: 00
00 AVR function enabled
01 AVR function disabled
02 AVR function disabled during deceleration
03 AVR function disabled upon a stop command
The AVR function automatically regulates the AC drive’s
output voltage to meet the value set in 50.06 (Motor
Nameplate Voltage).
Example: If 50.06 is set at 200V AC and the input voltage is
varying between 200V to 264V AC, the drive’s output voltage
will automatically be limited to 200V AC.
Without AVR function, the Motor Nameplate Voltage may
vary between 180V to 264V AC, due to the input voltage
varying between 180V to 264V AC.
Selecting value 2 enables the AVR function and also disables
the AVR function during deceleration. This offers a quicker
deceleration and is most commonly used.
Overload %
Time
(Min)
100 120 140 160 180 200
Overload Endurance Curve
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Load Factor %
Operation
Time
(Min)
0 20 60 100 140 18040 80 130 160
200
5
4
3
2
1
5 Hz
10 Hz
50 Hz
60 Hz
or More
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