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Electrical connections
7.5 Electrical connections
7.5.1 Precautions when connecting to the power supply
• Use ring-pressure terminals for connections to the power supply terminal block. If this is not possible for
unavoidable reasons, the instructions below should be followed.
• Do not connect wires of dierent cross-sections to the same power supply terminal block. (Looseness in
the power supply wires can cause overheating)
• When connecting electric wires of the same cross-section, proceed as shown in the figure.
Fig. 47
• Use a suitable screwdriver to tighten the screws on the terminal block. A small-tipped screwdriver could
damage the screw head and make tightening impossible.
• Over-tightening the screws on the terminal block could damage them.
• Connect an earth leakage circuit breaker and a fuse or magnetothermic circuit breaker to the power
supply line.
• When making connections, use cables with the required specifications, carry out the connection proce-
dures thoroughly, and secure the wires avoiding external pressure on the terminal connectors.
Wiring diagram of the electrical control system for the cascade system (3N ~)
Fig. 48
Master Unit
Slave Unit
Master Unit
On/O
switch
FuseFuse Fuse Fuse
Power supply
Distribution panel Distribution panel Distribution panel Distribution panel
Slave Unit 1 Slave Unit 2
Only the last IDU
requires construction
heater to be added to
H1 and H2
External heater
Slave Unit x
Please use shielded wire, and the shielding layer must be earthed
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