Selecting The Power Unit - Festo CPV Series Manual

1. Installation

1.3.3 Selecting the power unit

Total current
consumption
CP-DN8 9806NH
WARNUNG:
Use only power units which guarantee reliable isola-
tion of the operating voltages as per IEC 742 / EN
60742 / VDE 0551 with at least 4 kV isolation resist-
ance (protected extra low voltage, PELV). Switch
power packs are permitted, if they guarantee
reliable isolation in accordance with EN 60950 /
VDE 0805.
The current consumption of a CP valve terminal de-
pends on the number of valve coils. We recommend
the following:
• Use only closed-loop power units.
• When selecting the power unit, check whether it pro-
vides sufficient output. If necessary, calculate here
the total current consumption in accordance with the
following table.
• Connect the load voltage for the CPV valve coil via
the EMERGENCY STOP circuit.
The table below shows you how to calculate the total
current consumption of a CPV valve terminal. The
values specified have been rounded up.
Current consumption of bus interface and
logic
CPV valve terminal
Current consumption of valve supply
Current consumption of all
valve coils simultaneously
1)
energized
1)
Current consumption depends on valve type (see technical
specifications of valves)
Sums
__ x ____ mA = ______ mA
50 mA
1-13