ACX1_TAU_SYNC_UserManual_En
Page 20 of 37
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36071 ARZIGNANO (VI) ITALY
Phone +39 0444 470511 - Fax +39 0444 451803
sales@sme-group.com - www.sme-group.com
The following table shows you the most common cases:
Standard Wire Dimensions
Average Current [Arms]
Minimum Wire
Section Suggested
[mm
2
]
Wire Size
mm
2
AWG
100 20 21.1 4
150 30 33.6 2
200
40
42.4
1
250
50
53.5
0
300
60
67.4
2/0
350
70
85
3/0
3.3 Main Contactor
The Controller must be connected to one Main Contactor for two basically reasons:
• Capacitors Pre-Charge : The Controller handles all this phase internally by
discharging/charging its DC-Bus through the Key Input. As soon as a certain voltage value is
reached by the DC-Bus, the Controller can close the Main Contactor connecting it to the
Battery. In this way dangerous shocks on Controller's capacitors are avoided.
• Safety: In case of dangerous situations, the Main Contactor must be opened disconnecting
the Battery from Controller. If the main contactor coil is not connected to the controller,
the system will not meet EEC safety requirements.
Sizing
In order to select the Main Contactor, it must be considered the Controller Ratings, the Duty Cycle
of the System and several other working conditions. The following empirical formula can be useful
to quickly find the Main Contactor minimum rating I
MC
:
with
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