Component Sizing; Sizing Of Mcb For Switching Frequency Filter; Dc Bus Capacitance And Inductance Values - Emerson SP1201 Installation Manual

Safety Product
Introduction
Information information
11

Component sizing

11.1 Sizing of MCB for switching
frequency filter
The current rating of the MCB must be calculated; taking into account
the switching frequency filter inductance and capacitance, the initial
charging current and the AC supply voltage. Switching frequency filter
inductance and capacitance values can be found in section 3.10 Regen
components on page 25.
L = 2 x L L = Switching frequency filter inductance
f f
C = 3C / 2 C = Switching frequency filter capacitance
f f
V = V peak V = Charging voltage
c LL c
L
Z = Z = Charging impedance
--- -
c c
C
π LC
T = T = Charging time
c c
I = V / Z I = Charging current
c c c c
Example:
SP5402 (Heavy Duty) Regen
Switching frequency filter Inductance 190µH
Switching frequency filter Capacitance 77µF
Table 11-1 DC bus capacitance and inductance values
Voltage Model
SP1201 SP1202
SP1203 SP1204
SP2201 SP2202 SP2203
SP3201 SP3202
200V SP4201 SP4202 SP4203
SP5201 SP5202
SPMD1201
SPMD1202
SPMD1203 SPMD1204
SP1401 SP1402 SP1403
SP1404
SP1405 SP1406
SP2401 SP2402 SP2403 SP2404
SP3401 SP3402 SP3403
SP4401
SP4402 SP4403
400V
SP5401 SP5402
SP6401
SP6402 SPMA1402
SPMA1401
SPMD1401
SPMD1402
SPMD1403 SPMD1404
SP3501 SP3502 SP3503 SP3504
575V
SP3505 SP3506 SP3507
SP4601 SP4602 SP4603
SP4604 SP4605 SP4606
SP5601 SP5602
690V SP6601 SP6602
SPMA1601 SPMA1602
SPMD1601 SPMD1602
SPMD1603 SPMD1604
Unidrive SP Regen Installation Guide
Issue Number: 2
System Mechanical Electrical
design installation installation
Total DC bus
capacitance
µF
940
1640
2820
5400
4400
3300
4400
5500
6600
235
410
410
705
1350
1100
2200
3300
4400 L1, L2, L3 0.054
5500 L1, L2, L3 0.054
4400 L1, L2, L3 0.054
4400
5500
6600
1000
733
1467
2200 L1, L2, L3 0.313
2200
2933
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Getting
Optimisation Parameters
started
Supply Voltage 480v + 10%
L = 2 x 190µH =
C = 3 x 48µF / 2 =
480 + 10% x √2 =
V =
c
380µH
Z = ----------------- - =
c
96µF
π 380µH ×
T = 96µF
c
I = 747 / 1.98 =
c
The MCB should be rated to the peak charging current of 377A for
600µs, with an rms current of 35A. A suitable MCB should have the
following ratings and features:
Voltage rating: 480 + 10%
Peak current rating: 377A
rms current rating:35A
3 pole with auxiliary (for enable)
NOTE
The rms current rating specified is taken from the rated continuous
current for the selected switching frequency filter capacitor data sheet.
The MCB is sized both for the system current and voltage, and must also
take into account the cable size from the capacitor branch circuit to the
main circuit.
Total DC bus
inductance
mH
1.4
0.7
0.211
0.150
1.25
1.4
0.7
0.85
0.423
0.150
4
1.27
0.470
Technical Component
data sizing
380µH
96µF
747V pk
1.98Ω
= 600µs
377A
Diagnostics
203