Power Supply, Grounding, And Shielding - Panasonic HM500 Series Instruction Manual

Connections
9.6

Power supply, grounding, and shielding

The power supply terminal block is shown in the figure below.
+24V
Common
NOTICE
Make sure that the power supply has sufficient power capacity for the operation of the equipment.
The unit must always be grounded to earth. Grounding helps limit the effects of noise due to electro-
magnetic interference on the control system.
Earth connection will have to be done using either the screw or the faston terminal located near the
power supply terminal block. A label helps identify the ground connection. Also ground the terminal 3
on the power supply terminal block.
The power supply circuit may be floating or grounded. In the latter case, connect to ground the power
source common as indicated with a dashed line in the figure below.
When using the floating power scheme, note that internally the power common is connected to the
ground with a 1MΩ resistor in parallel with a 4,7nF capacitor.
The power supply must have double or reinforced insulation. The suggested wiring for the power sup-
ply is shown below.
All the electronic devices in the control system must be properly grounded. Grounding must be per-
formed according to applicable regulations.
HM5xx
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