INFO
The frame ground terminal must be connected to the cabinet. The controller rack must also be connected to the cabinet, to
create a protective earth.
CAUTION
The frame ground is connected to the power supply terminals through transient voltage suppression diodes (commonly
known as transorbs). In order to protect the frame ground and power supply, no more than 36 V is allowed between the
frame ground and the power supply terminals.
6.2.3 Power supply wiring
Connect the power supply (+) to the 12 or 24 V DC power supply.
Connect the power supply (-) to the 0 V DC power supply.
CAUTION
Do not wire the negative power supply terminal of the modules with independent power supplies (for example, PSM 3.1) to
the ship single-phase ground. If the voltage between the power supply terminals and frame ground exceeds 36 V, then the
power supply terminals and the frame ground terminal will be damaged.
Figure 6.1
Recommended wiring for the power supply
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