Festo FED-50, Manual

Page: 78 / 106

3. Installation
3-6
Festo FED-... en 0209NH
3.3 Power Supply and Grounding
The power supply connection on the FED HMI 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.