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Unidrive SP Regen Installation Guide 43
Issue Number: 2 www.controltechniques.com
Table 4-10 400V Regen system maximum cable lengths
Table 4-11 575V Regen system maximum cable length
Table 4-12 690V Regen system maximum cable length
Cable lengths in excess of the above specified values may be used only
when special techniques are adopted; refer to the supplier of the drive.
4.6.2 High-capacitance cables
The maximum cable length is reduced from that shown if high
capacitance cables are used.
Most cables have an insulating jacket between the cores and the armour
or shield; these cables have a low capacitance and are recommended.
Cables that do not have an insulating jacket tend to have high
capacitance; if a cable of this type is used, the maximum cable length is
half that quoted in the tables. (Figure 4-7 shows how to identify the two
types.)
Figure 4-7 Cable construction influencing the capacitance
The cable used is shielded and contains four cores. Typical capacitance
for this type of cable is 130pF/m (i.e. from one core to all others and the
shield connected together).
4.6.3 EMC filter
When an EMC filter is used the capacitors to ground carry common
mode current.
When the maximum cable length without additional ventilation specified
is exceeded, extra circulating currents can result in heating and
saturation of the EMC filter. To prevent this, some capacitance line to
ground should be provided as an additional path for this current, as
shown in Figure 4-8. See also section 4.4.3 Motor connection on
page 41.
Model
400V Nominal AC supply voltage
Maximum permissible cable length with forced cooling
3kHz 4kHz 6kHz 8kHz 12kHz 16kHz
Forced
cooling
requirements
SP1405
200m
(660ft)
150m
(490ft)
100m
(330ft)
75m
(245ft)
50m
(165ft)
37m
(120ft)
Air flow
>
160m
3
/ hr
SP1406
SP2401
SP2402
SP2403
SP2404
SP3401
SP3402
SP3403
SP4401
250m
(820ft)
185m
(607ft)
125m
(410ft)
90m
(295ft)
SP4402
SP4403
SP5401
SP5402
SP6401
SP6402
SPMA1401
SPMA1402
SPMD1401
SPMD1402
SPMD1403
SPMD1404
Model
575V Nominal AC supply voltage
Maximum permissible cable length with forced cooling
3kHz 4kHz 6kHz 8kHz 12kHz 16kHz
Forced
cooling
requirements
SP3501
200m
(660ft)
150m
(490ft)
100m
(330ft)
75m
(245ft)
Air flow
>
160m
3
/ hr
SP3502
SP3503
SP3504
SP3505
SP3506
SP3507
Model
690V Nominal AC supply voltage
Maximum permissible cable length with forced cooling
3kHz 4kHz 6kHz 8kHz 12kHz 16kHz
Forced
cooling
requirements
SP4601
200m
(660ft)
185m
(607ft)
125m
(410ft)
90m
(295ft)
Air flow
>
160m
3
/ hr
SP4602
SP4603
SP4604
SP4605
SP4606
SP5601
SP5602
SP6601
SP6602
SPMA1601
SPMA1602
SPMD1601
SPMD1602
SPMD1603
SPMD1604
Normal capacitance
Shield or armour
separated from the cores
High capacitance
Shield or armour close
to the cores
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