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Digistart D3: User Guide
Issue: G
4.5 Bypass Contactor
Some Digistart D3 soft starters are internally bypassed and do not require an external bypass contactor.
Non-bypassed soft starters may be installed with an external bypass contactor. Select a contactor with an AC1 rating
greater than or equal to the full load current rating of the connected motor.
Internally bypassed models:
D3-0023-B, D3-0043-B, D3-0050-B, D3-0053-B, D3-0076-B, D3-0097-B, D3-0100-B, D3-0105-B, D3-0145-B,
D3-0170-B, D3-0200-B, D3-0220-B, D3-0255-B, D3-0350-B, D3-0425-B, D3-0500-B, D3-0580-B, D3-0700-B,
D3-0820-B, D3-0920-B, D3-1000-B
Non-bypassed models:
D3-0255-N, D3-0360-N, D3-0380-N, D3-0430-N, D3-0620-N, D3-0650-N, D3-0790-N, D3-0930-N, D3-1200-N,
D3-1410-N, D3-1600-N
4.6 Main Contactor
A main contactor must be installed if the Digistart D3 is connected to the motor in inside delta format and is optional
for in-line connection. Select a contactor with an AC3 rating greater than or equal to the full load current rating of the
connected motor.
4.7 Circuit Breaker
A shunt trip circuit breaker may be used instead of a main contactor to isolate the motor circuit in the event of a soft
starter trip. The shunt trip mechanism must be powered from the supply side of the circuit breaker or from a separate
control supply.
4.8 Power Factor Correction
If power factor correction is used, a dedicated contactor should be used to switch in the capacitors.
To use the Digistart D3 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.
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.
4.9 EMC (Electromagnetic compatibility)
4.9.1 Immunity
The Digistart D3 complies with the following international immunity standards as required for IEC60947-4-2:
Standard
Type of Immunity
Application
Level
IEC61000-2-4
Harmonics
Class 3
IEC61000-4-2
Electrostatic Discharge
Housing of equipment
Level 3
IEC61000-4-3
Radiated radio frequency field
Housing of equipment
Level 3
IEC61000-4-4
Successive rapid transients
Control and power cables
Level 4
IEC61000-4-5
Surges
Power cables
Level 4
IEC61000-4-6
Conducted radio frequency
Control and power cables
Level 3
IEC61000-4-11
Voltage dips & short time interruptions
Class 2
4.9.2 Conducted and Radiated Emissions
If the Digistart D3 is installed in accordance with the wiring instructions, the Digistart D3 complies with the following
international immunity standards:
Standard
Emissions
Level
IEC60947-4-2
Conducted on power supply from 150 kHz to 30MHz
Complies
IEC60947-4-2
Radiated emissions from 30 to 1000 MHz (CISPR 11 Group 1 class B) Complies
Содержание D3-0023-B
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