M588-00-880 Issue E
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Appendix A2
A2.10.2 External voltage
The auxiliary gauge input on the rear of the GXS (available as an optional accessory, shown in Figure 3, item 14) can
be used as a 0 - 10 V speed control for either the dry pump or the booster. The connector is a standard RJ45, refer
to Figure A51 to identify the pin numbers. Use pin 3 for the external voltage signal and pin 5 for signal common.
Figure A51 - Pin numbers on the auxiliary gauge interface
The 0-10V input is scaled linearly and may be configured such that the pump runs at 100% speed when the input
voltage is either 0V or 10V. The pump speed may be decreased to 20Hz by increasing / decreasing the supply voltage
depending on the external voltage speed control configuration.
Note: If the cable becomes disconnected, the pump will run at full speed.
To enable external voltage as the speed control source, use the PDT to select external voltage for the appropriate
pump.
A2.10.3 SIM protocol
It is possible to independently control the speed of both the dry pump and the booster using the built-in SIM protocol.
Refer to the SIM Protocol Manual (P411-00-200) for details of the commands to use.
The GXS supports the SIM protocol by both the Ethernet and the serial ports. Refer to Appendix A2.12 for information
about setting up the Ethernet interface and to Appendix A2.13 for details of how to use SIM protocol with a serial
port.
A2.10.4 Second speed control
A second speed setting can be configured using the PDT and used to control the speed of either the booster or the
dry pump.
The second speed setting can be enabled and disabled using the PDT from the Command menu, using the SIM protocol
or the MCM MicroTIM configured for speed control. Refer to Appendix A2.14 for information how to configure the
MicroTIM.
A2.10.5 Profibus interface
It is possible to independently control the speed of both the dry pump and the booster using the optional Profibus
interface, available as an accessory. For more information, refer to the GXS Profibus instruction manual
D397-53-880. The GSD file is available from Edwards.
If using Profibus, ensure that speed control is set to normal (default setting) for both the pump and booster.
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