130
Commander SE Advanced User Guide
Issue Number: 4
4.10.3 SE Inrush resistor
*Commander SE size 5 uses a resistor as its inrush current limiting resistor. Its value remains constant as the temperature
increases.
The Commander SE sizes 1 to 4 use surge guards as its inrush current limiting resistors. The ohmic values are
given at 25
o
C. This ohmic value reduces as the surge guards temperature increases.
4.11 High-capacitance cables
Most cables have an insulating jacket between the cores and armour or shield; these cables have 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 table. The drawing below shows how to identify the two types.
Figure 4-10 Cable construction influencing the capacitance.
Maximum motor cable lengths
The capacitive loading of the drive by the motor cable means that the cable length limits shown in the table must be
observed. Failure to do so can result in spurious OI.AC tripping of the drive. If longer cable lengths are required, consult your
local Drive Centre or distributor.
The capacitance of the cable used for the maximum cable lengths and EMC testing on Commander SE was measured at
412pF/m when using method 1 and 130F/m when using method 2, as below.
Method 1
By connecting the 3 phases together as one node and connecting the screen and earth (if any) as the other node and
measuring the capacitance between these two points.
Drive
Inrush resistor
Ω
at 25
o
C
Drive
Inrush resistor
Ω
at 25
o
C
SE11200025
10
SE33200550
30
SE11200037
10
SE33200750
30
SE11200055
10
SE33400550
30
SE11200075
10
SE33400750
30
SE2D200075
20
SE43401100
30
SE2D200110
20
SE43401500
30
SE2D200150
20
SE43401850
30
SE2D200220
30
SE53402200
22*
SE23200400
30
SE53403000
22*
SE23400075
20
SE53403700
22*
SE23400110
20
SE23400150
20
SE23400220
20
SE23400300
30
SE23400400
30
NOTE
Normal capacitance
Shield or armour
separated from the cores
High capacitance
Shield or armour close
to the cores
412pF
Содержание COMMANDER SE
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Страница 142: ...142 Commander SE Advanced User Guide Issue Number 4 Figure 6 9 Input line reactor 4400 0241 All dimensions in mm...
Страница 144: ...144 Commander SE Advanced User Guide Issue Number 4 Figure 7 3 Commander SE Size 4 All dimensions in mm...