Page 520 - Motor_protection_and_control_Manual_motor_starters_ contactors

Influence of the length of conductors

used in contactor control circuit

Under certain conditions the excessive length of the control circuit conductors may prevent the contactor
from carrying out closing and opening orders.
– no closing: due to excessive voltage drop (in AC or DC)
– no opening: due to excessive capacitance (in AC).
1SBC101014V0014 Contactor Closing (contactor with AC or DC operated coil).
The voltage drop is due to the pull-in current (pull-in power) and to the resistance of the control circuit conductors.
The table and graph below can be used to determine the single length of line feeders (distance between
AF40-30-00 the control device and the contactor coil) in relation to:
– the coil pull-in consumption.
– the supply voltage.
– the connecting wire cross-sectional area.

5 The graph has been drawn for a max. line voltage drop of 5 %.
Coil pull-in consumption (average value)
3-pole contactors AC control DC control 4-pole contactors AC control DC control
supply supply supply supply
1SFC101133V0001 AF09, AF12, AF16, AF26, AF30, 50/60 Hz 50 W AF09, AF16, AF26, AF38 50/60 Hz 50 W
50 VA
50 VA
AF38
AF09Z, AF12Z, AF16Z, AF26Z, 20 VA 20 W AF09Z, AF16Z, AF26Z, AF38Z 20 W 20 W
40 VA
40 W
AF40, AF52, AF80
AF30Z, AF38Z AF116, AF140 185 VA 170 W
AF40, AF52, AF65 25 VA 25 W AF190, AF205 190 VA 180 W
AF370-30-11 AF80, AF96 40 VA 40 W AF265, AF305, AF370 405 VA 445 W
AF116, AF140, AF146 180 VA 170 W
AF190, AF205 195 VA 185 W
AF265, AF305, AF370 405 VA 465 W
AF400, AF460 1005 VA 960 W
AF580, AF750, AF1250 940 VA 900 W
AF1350, AF1650, AF2050, AF2650 2450 VA 2290 W

Permissible single length for the control circuit conductors on contactor closing:
Depending on the coil pull-in power consumption on the supply voltage and on the control circuit conductor cross-sectional area.
40000 25000 15000 10000
single line length in m 20000 10000 2900 5000 660 V - 690 V
20000
30000
10000
5000
3000
10000
2000
5000
5000
2000
3000 3000 1000 500 V
1000 380 V - 400 V
2000 500
1000
500 300
1000 220 V - 230 V
500 300 200
500 200
300
100 110 V
300 200
100
200 50
100 60 V
50
100 30 48 V
50 30 20
50 20
30
10 24 V
30 20
10
20 5
10
5
10 3
5 3 2
5 3 2
4 2.5 1.5 1 13 57 9 13 57 9 13 57 9 13 57 9
4 2.5 1.5 1 1 2 3 5 10 20 30 50 70 100 200 300 500 1000 2000 5000 10000
Coil pull-in consumption: in VA for AC operated contactors
Cross-sectional area (Cu) in mm 2
in W for DC operated contactors 1SBC100063S0201
Example AF09 contactor: Coil voltage: 230 V 50 Hz, contactor coil pull-in power consumption: 50 VA, control circuit conductor cross-sectional
area: Cu 1.5 mm². Max. permissible length: 2900 m.
5/320 | ABB