Main Isolator / Earth Switch; R Rated" Protection Fuses; Power Factor Correction Capacitor Contactor; Line Inductors - AuCom MVS Series Product Manual

POWER CIRCUITS

5.4 Main Isolator / Earth Switch

5.5 "R Rated" Protection Fuses

5.6 Power Factor Correction Capacitor Contactor

5.7 Line Inductors

5.8 Transient / Overvoltage Protection

5.9 Medium Voltage Control Supply Transformer

710-03261-00A
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If specified, a main isolator/ earth switch can be connected upstream of the main
contactor as shown in Diagram 4. The isolator interlocks the panel door to ensure
personnel safety.
If specified, "R Rated" protection fuses can be installed on the input side of the
starter to provide Type 2 coordination and short circuit protection for the motor
branch circuit. The appropriate fuse should be selected from the table below,
based on the motor's rated full load current.
Motor Rated FLC
70 A
100 A
130 A
150 A
170 A
200 A
230 A
390 A
Ferraz type code
Bussmann type code
If power correction factor capacitors are being used, a contactor can be selected
according to the required kVAr, and should be connected upstream of the MVS soft
starter. The power factor correction capacitor contactor coil is associated with
output terminals 31, 34 of the MVS (refer to Diagram 4).
To ensure that the potentially dangerous medium voltage area is isolated from the
low voltage control area, power is supplied to the power factor correction capacitor
contactor coil from the control voltage terminal block (refer to Diagram 2).
NOTE
The capacitor bank must be connected to the input side of the MVS soft
starter.
Line inductors are required if the cable run between the soft starter and the motor
is more than 200 m. Line inductors should be installed outside the panel, and
connected between terminals T1, T2, T3 of the soft starter and the motor.
Overvoltage protection should be installed if there is a risk of high transients at the
installation. If required, use the optional Overvoltage Protection Kit.
The control supply for the MVS soft starter should usually be provided as a low
voltage supply (110~130 VAC or 220~240 VAC). If this is not possible, a control
supply transformer will be required. A transformer should be selected with primary
voltage matching the mains voltage and secondary voltage of 110 VAC. Use a
single phase ~ 500 VA transformer with protection fuses on both primary and
secondary side (refer to Diagram 4).
System Voltage System Voltage
2.3 kV 3.3 ~ 4.2 kV
2R
3R
4R
5R
6R
9R
12R
18R
A240Rrr A480Rrr-1
JCK JCL
16
System Voltage
6 ~ 7.2 kV
A072xxDxRO-rr
JCR-A, JCR-B
MVS
SERIES