Festo FED Series, Manual, Page: 82 / 115

3. Installation
3−6
Festo FED−... en 0311a
3.3 Power Supply and Grounding
The power supply connection on the FED operator panel is
shown in fig. 3/5. The 24 V plug is supplied with the FED.
Fig.3/5: power supply connection
Please note
Make sure that the power supply connection has sufficient
power capacity for operating the equipment.
Grounding helps limit the effects of noise due to electromag
netic interference on the control system.
For grounding, use the fastening screws or the plug on the
housing. A yellow/black label will help you identify the
ground connection. Also connect to ground the pin 3 on the
power supply terminal block.
The power supply circuit may be floating or grounded. In the
latter case connect to ground the common power source as
shown in figure 3/6 with a dashed line. When using the float
ing power scheme, note that the FED HMI are internally con
nected with protective earth by a 1MOhm resistor in parallel
with a 10 nF capacitor. The power supply must have double or
reinforced insulation
The suggested wiring for the power supply is shown in
Fig.3/6.