Menu 4
Commander SK Advanced User Guide
63
Issue Number: 9 www.controltechniques.com
The scaling of the current feedback is based on the ratings of the drive as follows:
* On drives that offer dual rating, the rated current can be increased above the rated drive current up to a level not exceeding 1.36 x drive rated
current. The actual level varies from one drive size to another.
The drive has a current controller to give current limiting in frequency control mode and a torque controller in torque control mode. The active current
is controlled by modification of the drive output frequency. Menu 4 provides parameters to set-up the current controller. Additional voltage based
current control is provided to limit transients (peak-limit), but there are no user parameters to control this.
The drive operates in the stator flux reference frame under steady state conditions. The absolute maximum motor current is defined by the peak limit
system as 1.75 x rated drive current. However, the drive does not normally operate at this level, but uses the peak limit system as protection against
over-current trips. Under normal operation the motor current is limited to 1.50 x rated drive current, allowing a safety margin between the maximum
normal operating current and the peak limit level.
DRIVE_CURRENT_MAX is full scale current feedback, i.e. rated drive current x 2.0.
The relationship between the voltage and current is shown in the following vector diagram.
Level
x rated drive current
Over-current trip
2.2
Open-loop peak limit
1.75
Open-loop maximum standard operating current
1.5
Rated drive current
1.0
Maximum Normal Duty current rating
≤
1.36*
Maximum motor rated current
≤
1.36*
200V
400V
575V
690V
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
current
rating
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
current
rating
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
current
rating
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
current
rating
2202
17
17
22
2401
13
13
15.3
3501
4.1
4.1
5.4
4601
19
19
22
2203
25
25
28
2402
16.5
16.5
21
3502
5.4
5.4
6.1
4602
22
22
27
3201
31
31
42
2403
23
25
29
3503
6.1
6.1
8.4
4603
27
27
36
3202
42
42
54
2404
26
26
29
3504
9.5
9.5
11
4604
36
36
43
4201
56
56
68
3401
32
32
35
3505
12
12
16
4605
43
43
52
4202
68
68
80
3402
40
40
43
3506
18
18
22
4606
52
52
62
4203
80
80
104
3403
46
46
56
3507
22
22
27
5601
63
63
84
4401
60
60
68
5602
85
85
99
4402
74
74
83
6601
85.7
100
125
4403
96
96
104
6602
107.1
125
144
5401
124
124
138
5402
156
156
168
6401
154.2
180
205
6402
180
210
236
v*
Stator flux
(in steady state)
ϕ ≈
cos (PF)
-1
R i
s sx
R i
s sy
i
sy
Содержание 2202
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