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

12.6 Power supply, grounding, and shielding

The power supply terminal block is shown in the following figure.
+24V
L
Common M
NOTE
Make sure that the power supply has sufficient power capacity for the operation of the product.
The product must always be grounded to earth. Grounding helps limit the effects of noise due to
electromagnetic interference on the control system.
Earth connection must be done using either the screw or the faston terminal located near the power
supply terminal block. A label identifies 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, the power source common
is connected as indicated with a dashed line in the following figure. 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 supply is shown in the following figure.
L1
N
L+ M
All the electronic devices in the control system must be properly grounded. Grounding must be
performed according to applicable regulations.
ACGM0194V3EN Version 3.0
L
1
M
2
3
Panel
Connections
19