3.3
Electrical connections
Attention
The electrical installation must correspond to the applicable codes. The mains supply
and earthing lines must be of suitable size.
The installation must be earthed and protected by fuses in each phase. Install an
isolating switch near the compressor.
Make sure that this switch is open to isolate the compressor from the mains
before carrying out any connection.
Supply cable
for the section of the power supply cable.
An electric cable is provided on the unit. Fit a suitable plug on the cable.
Plug in the cable.
Three voltage units
The compressors leave the factory wired for 230 V. If the compressor is to be used on 460 V, rewire the
motor as follows:
1. Take all necessary precautions.
2. Change the connection in the motor terminal box according following instructions:
• For SF 2, SF 2
+
, SF 4 and SF 4
+
:
• For SF 6 and SF 6
+
:
3. Change also the voltage connection on auxiliary transformer T1.
4. Replace the fuses.
5. Adjust the overload relay settings (see section
Settings of overload relay and fuses
.
Instruction book
2920 7110 11
21
Summary of Contents for SF 1
Page 1: ...Atlas Copco Oil free scroll compressors SF 1 SF 2 SF 4 SF 6 Instruction book ...
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