B722-40-880 Issue F
Page 26 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
Figure 8 - Logic interface connections - parallel mode
3.6 Parallel interface mode
If using the Normal and Fail lines to drive the coils of d.c. relays, include a back EMF suppression diode in parallel
with each relay coil to protect the DX pump.
1. Connect the customer control equipment to the control input pins of the customer logic interface mating half.
Refer to Tabl e 10, which identifies the Logic Interface connector pins. The control inputs are as follows:
Start
Standby Speed
To activate either of these control inputs, connect the control input pin to the 0 V control reference.
For example, to start the pump, connect pin 3 (Start / Stop) to pin 2 (0 V Reference). To stop the pump, break the
connection between pin 3 and pin 2.
Note: Serial Enable is also a control input but is not required in a system operating purely in Parallel Mode. Make
sure that there is no connection to Serial Enable (pin 5).
2. To monitor Analogue Output, connect the customer control equipment to the pump Analogue Output (pin 9) and
to pin 2 of the logic interface mating half.
When the pump is shipped, the Analogue Output is configured to monitor pump rotational speed. To monitor other
parameters, re-configure the DX pump using commands over the Serial Interface. Refer to Section 3.7 for further
details.
3. To monitor the Normal status output, connect the customer control equipment to the Normal status output (pin
15) and to pin 2 of the logic interface mating half. The output can be used to control other devices in the
pumping system. The output can drive a low power relay of up to 24 V coil rating.
1. 24 V d.c. electrical supply
2. Fuse
3. Optional LED indicator - system OK
4. Optional LED indicator - normal speed
5. Current limit resistor for LED
6. DX pump logic interface
7. Start switch
8. Optional standby switch
9. Optional voltmeter
to monitor analogue output
To Next Page
Loading...
Need help?
General
