Power Supply, Grounding And Shielding - Hitachi EH-TP504 Operating Instructions Manual

6. Power Supply, Grounding and Shielding

The power supply terminal block is shown in the figure below.
Note: Ensure that the power supply has enough 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 fasten terminal located near the power
supply terminal block. A label helps identify the ground connection. Also connect to 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 shown in figure (see below) with a dashed line.
When using the floating power scheme, note that the panes internally connects the power common to
ground with a 1Mresistor in parallel with a 4,7nF capacitor. The power supply must have double or
reinforced insulation. The suggested wiring for the power supply is shown below.
All the electronic devices in the control system must be properly grounded. Grounding must be performed
according to applicable regulations.
EH-TP500 Series
Operating Instructions
VER 1.00
Power Supply, Grounding and Shielding
Fig. 6.1
Fig. 6.2
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