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80 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 7
5.5 Menu 4: Torque and current control
The scaling of the current feedback is based on the rating of the drive as follows:
Rated drive current is 1 per unit current and is related to the scaling of the drive current feedback. For most drive sizes the Rated drive current is the
same as the Maximum heavy duty current rating defined by Pr 11.32. The Maximum heavy duty current rating is the maximum value of rated motor
current (defined by Pr 05.07 or 21.07) that can be set for operation with the force vented motor protection characteristic - Pr4.25=0 (see Pr 04.16 for
more details). If the Rated drive current and Maximum heavy duty current rating are the same then the drive uses 1.75 x Maximum heavy duty current
rating for the open-loop peak limit and the maximum standard operating current for closed-loop modes. This is the limit up to which the drive can
control current normally. The current range above this is allowed for current controller overshoot and for additional current feedback pulses
associated with long cable operation. For some of the larger drive sizes the Maximum heavy duty current rating is higher than the Rated drive current,
therefore the potential overload at 1.75 x Rated drive current is reduced.
The motor rated current (defined by Pr 5.07 or Pr 21.07) may be increased above the maximum Heavy Duty current rating up to the maximum Normal
Duty rated current (except for Servo and Regen modes). When the motor rated current is above the maximum Heavy Duty current rating the drive
always provides motor protection scheme that is intended for variable torque applications (see Pr 4.16 on page 97 for more details). The maximum
rated current is the maximum rated current allowed for Normal Duty operation.
Table 5-3 gives the Rated drive current, maximum Heavy Duty current rating and maximum Normal Duty rated current for all drive sizes and voltage
ratings.
Table 5-3
UNISP6xxx and UNISP7xxx drive modules can be connected in parallel to make a larger drive. The currents are then defined as follows:
Rated drive current
Rated drive current is the sum of the module currents.
Level x Rated drive current
Over-current trip 1/0.45 = 2.22
Open-loop peak limit 1.75
Closed-loop vector, Servo and Regen maximum standard operating 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
rated
current
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
rated
current
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
rated
current
Model
Rated
drive
current
Max
Heavy
Duty
current
rating
Max
Normal
Duty
rated
current
1201 4.3 4.3 5.2 1401 2.1 2.1 2.8 3501 4.1 4.1 5.4 4601 18 18 22
1202 5.8 5.8 6.8 1402 3.0 3.0 3.8 3502 5.4 5.4 6.1 4602 22 22 27
1203 7.5 7.5 9.6 1403 4.2 4.2 5.0 3503 6.1 6.1 8.4 4603 27 27 36
1204 10.6 10.6 11 1404 5.8 5.8 6.9 3504 9.5 9.5 11 4604 36 36 43
2201 12.6 12.6 15.5 1405 7.6 7.6 8.8 3505 12 12 16 4605 43 43 52
2202 17 17 22 1406 9.5 9.5 11 3506 18 18 22 4606 52 52 62
2203 25 25 28 2401 13 13 15.3 3507 22 22 27 5601 62 62 84
3201 31 31 42 2402 16.5 16.5 21
5602 84 84 99
3202 42 42 54 2403 23 25 29
6601 85.7 100 125
4201 56 56 68 2404 26 26 29 6602 107.1 125 144
4202 68 68 80 3401 32 32 35 7601 85.7 100 125
4203 80 80 104 3402 40 40 43 7602 107.1 125 144
3403 46 46 56 7603 164.5 192 230
4401 60 60 68 7604 188.5 220 260
4402 74 74 83
4403 96 96 104
5401 124 124 138
5402 156 156 168
6401 154.2 180 202
6402 180 210 236
7401 154.2 180 202
7402 180 210 236
7403 205.7 240 290
7404 248.5 290 350
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