Norgren VS18, Инструкция по техническому обслуживанию, Страница: 48 / 97

VS18/VS26
MAINTENANCE & INSTRUCTION BOOKLET
8.1.1 Power supply and pin assignment
VS18/VS26 Fieldbus valve islands are designed to be used with a protective extra low voltage
(PELV) power supply (UL Class 2 Supply only) according to IEC 364-4-41. As a result, an earth
connection for safety reasons is not required because the supply voltage is restricted to a
maximum of 42.2 volts even under fault conditions. However, the earth must be connected. It is
not a protective earth, but is required to provide EMC shielding.
The power supply of the Fieldbus valve islands (excluding the version with AS-Interface or
FD67 bus) are made by an 4-pin M12 connector. Using Profibus DP, a 5-pin 7/8“ connector is
also available.
Male
M12 4-pin power connector for Fieldbus
Looking into node connectors
Pin no. Function Tolerance Max. current
1 24 VB logic circuit supply +/-25% 300mA
2 24 VA valves +/-10%
1)
3 0 volt -
2)
4 Earth - -
Note:
Both DeviceNet and CANopen nodes do not use pin 1 of the M12 power connector. This is due
to the power for the logic circuit being drawn from the network connection. For details on pin
assignment please refer to sections
8.3.1 (DeviceNet) and 8.4.1 (CANopen).
Male
7/8” 5-pin power connector for Profibus DP
Looking into node connectors
Pin no. Function Tolerance Max. current
1 - - -
2 0 volt -
2)
3 Earth - -
4 24 VA valves +/-10%
1)
5 24 VB logic circuit supply +/-25% 300mA
1) I
max
= 10mA + n * 60mA
n = number of energized solenoids
2) I
max
=
I
VA
+
I
VB
8.1.2 Max. current load on valve connectors
The digital outputs for activation the pilot valves are optimised for Norgren VS18/VS26 valves.
Among compliance of the following data, it is possible to use items from other manufacturers:
•
Maximum current: I
max
= 85mA (if VA = 24V DC)
•
Limitation of the inductive interrupting to U < 40V
•
Pin assignment according to ISO 15407-2
•
Output voltage: U
output
= U
supply
– 0.9V
VS2672926-KG00E_05/07 Page 48/97