Selecting The Power Unit - Festo Compact Performance Series Programming And Diagnosis

1. Installation

1.3.3 Selecting the power unit

WARNING
Use only power units which guarantee reliable electri-
cal isolation of the operating voltages in accordance
with IEC 742/EN 60742/VDE 0551 with at least 4 kV
isolation resistance. Switch power packs are per-
mitted, providing they guarantee reliable electrical
isolation as per EN 60950/VDE 0805.
The current consumption of a CP valve terminal de-
pends on the number of valve coils.
• Always use closed-loop controlled power units.
• When selecting the power unit, check that it provides
• Connect the operating voltage for the CP valve coils
Complete The table below shows how to calculate the complete
current con- current consumption for a CP valve terminal.
sumption The values specified have been rounded up.
Current consumption of bus interface
and logic
CP valve terminal
Current consumption of valve supply
Current consumption of all
valve coils supplied
simultaneously with power
1)
1-14
enough power. Include in your calculation the com-
plete current requirements as shown in the following
table.
via the EMERGENCY STOP circuit.
1)
Current consumption depends on valve type
(see technical specifications of the valves)
Sums
50 mA
__ x ____ mA = ______ mA
CP-CO 9905a