3.10
Power Factor Correction
If power factor correction is used, a dedicated contactor should be used to switch in the capacitors.
To use the ASA 4.0 Advanced to control power factor correction, connect the PFC contactor to a programmable relay set to Run. When
the motor reaches full speed, the relay will close and power factor correction will be switched in. Do not use the soft starter relay output
to directly switch in power factor correction.
K1
K1
1
2
4
3
20234.
A
1
Soft starter
2
Programmable output (set = Run)
3
Power factor correction contactor
4
Power factor correction
CAUTION
Power factor correction capacitors must be connected to the input side of the soft starter. Connecting power factor
correction capacitors to the output side will damage the soft starter.
3.11
Short Circuit Protection Devices (SCPD)
Fuses may be installed to protect the soft starter or the installation.
3.11.1
Type 1 Coordination
Type 1 coordination requires that, in the event of a short circuit on the output side of a soft starter, the fault must be cleared without risk
of injury to personnel. There is no requirement that the soft starter must remain operational after the fault.
HRC fuses (such as Ferraz/Mersen AJT fuses) can be used for Type 1 coordination according to IEC 60947-4-2 standard.
3.11.2
Type 2 Coordination
Type 2 coordination requires that in the event of a short circuit on the output side of a soft starter, the fault must be cleared without risk
of injury to personnel or damage to the soft starter.
Semiconductor fuses for Type 2 circuit protection are additional to HRC fuses or MCCBs that form part of the motor branch circuit
protection.
CAUTION
DC Brake: A high brake torque setting can result in peak currents up to motor DOL being drawn while the motor is stopping.
Ensure protection fuses installed in the motor branch circuit are selected appropriately.
CAUTION
Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit protection must be
provided in accordance with the National Electrical Code and any additional local codes.
ASA 4.0 Advanced
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