Parker BA-DME012 Guia Del Usuario página 15

Purge Economy
Allows the dryer to be controlled based upon demand. Applying a 24Vdc signal to this input will freeze the dryer's cycle and close the exhaust
valves. The dryer will remain in this operating state until the signal is removed, at which point it will continue cycling from the stage in the cycle
when the signal was applied.
Purge economy should not be used if a wet air receiver is installed between the compressor and the dryer as this could lead to overflow of
the dryer with the possibility of performance degradation or deterioration of the desiccant.
Only use a volt free contacts such as a dedicated pressure switch, relay or auxiliary on the compressor contactor. It is not designed to be
used with a current or voltage input.
Ensure wire lengths do not exceed 3m.
Connecting to the Auxiliary Connections
Ensure that the dryer is isolated from all supplies prior to connection.
1 Unscrew the facia screws and carefully pivot the facia forward.
2 Disconnect the tubes from the pressure gauges.
3 Gently prise the facia away from the body of the dryer, at the pivot points, and rest the facia on the floor.
4 Remove the control box lid.
5 Use the spare glands on the side of the control box for cable access.
Fault Relay Output
6 Referring to the image below for guidance, connect the coil of the switching device to the terminals #3 and #4 of the digital outputs
connector.
Stop / Start and Purge Input
7 Connect terminal #1 of the digital outputs connector (24Vdc) to the common pole of the switching device.
8 Connect the required contact of the switching device to the required terminal of the digital outputs (Stop / Start - terminal #3, Purge Input -
terminal #4).
Note. The image below shows connection to the normally open contact of the switching device, however the configuration of the contacts is
dependent upon the customers system.
The electrical enclosure will contain more than one live circuit as the relay connections will remain live when the supply to the dryer has been removed.
2
4 3
5
1
O/P #3 & #4
Fault Relay Configuration
Key:
1
2
O/P #3 &4
O/P #1
I/P #3 &4
Switching device (e.g. Relay)
Customer wiring
Digital Output Terminals 3 and 4.
Digital Output Terminal 1 (24V dc feed)
Digital Input Terminals 3 (Stop / Start) and 4 (Purge Economy)
O/P #1
Stop / Start and Purge Economy Configuration
11
2
3
4
1 5
I/P #3 / #4