16 D6.3.4/0715-0716/E
4 Electrical connection
4.1 General recommendations
The compressor terminal box has a wiring diagram on the inside of its cover. Before connecting
the compressor, ensure the supply voltage, the phases and the frequency match the nameplate
data.
When the compressor is shipped the motor protector is mounted in the terminal box. The
thermistors are factory connected. The power supply and the control circuit must be wired
according to the wiring diagram (see wiring diagram on the inside of the terminal box lid).
Figure 12: Terminal box preparation for cable gland fitting - Note position of screwdriver!
Diameter of hole at
terminal box (mm)
Table 2: Characteristics of the holes for cable bushings
Figure 13: Position of the holes for cable bushings (top view of a 6-cylinder compressor)
The protection class of each terminal box according to IEC 60529 is given in Table 3 hereunder:
Table 3: Protection class of terminal box according to IEC 60529
Cable glands can influence the protection class. Factory-fitted cable glands reduce the
protection class to IP41.
4.2 Electrical installation
4.2.1 Single-phase motors – Code C
Compressors up to model DKSL-15X are available with single-phase motors. They have one
main and one auxiliary winding. A single-phase equipment consisting of a start and run capacitor