Valve Position After Supply Voltage Failure; Safety Position - Burkert 3323 Operating Instructions Manual

6.1.3 Tank bottom valve
Viewing window with
Actuator housing
Actuator cover
Blind cover with
status indicator and
bayonet catch
Fig. 4: Structure, electromotive diaphragm valve with tank body bottom, Type 3325
6.2

Valve position after supply voltage failure

Valve position for devices without the SAFEPOS energy-pack:
If the electromotive actuator idles upon a supply voltage failure, the valve remains in the last position that it
was in.
If the supply voltage fails while the actuator is changing the valve position, the valve remains in an undefined
position. The flywheel mass of the actuator and the operating medium pressure continue to influence the valve
spindle until it finally idles.
Valve position for devices with the SAFEPOS energy-pack:
The valve adopts the safety position defined by the DIP switch position.
For a description of the SAFEPOS energy-pack, see chapter "7.2" on page 22
6.3

Safety position

The DIP switch defines the safety position that the valve assumes in the following scenarios:
• Internal error
• Supply voltage failure (optional)
This function is only available for devices that have the optional SAFEPOS energy-pack accessory.
The following safety positions are available for selection for SAFEPOS:
• Close = valve closed
• Open = Valve opened
• Inactive = valve remains in an undefined position in the event of a supply voltage failure.
16
Valve body
Diaphragm socket
Actuator base
position indicator
English
Type 3323, 3324, 3325
Structure and function
Diaphragm
Electrical connectors
(circular plug-in connector or cable gland)