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Page 5
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Introduction
B722-40-880 Issue H
1.4.7
Electronic braking
The pump has a user selectable Electronic Braking option that is disabled by default. With this option disabled, the
pump will draw power from the supply when accelerating and running and will coast down when decelerating.
The Electronic Braking function may be enabled to reduce the pump deceleration time and to recover some energy
from the pump. This is achieved by returning power from the pump to the electrical supply. The rate at which
electrical energy is returned to the supply is regulated so as to limit the supply voltage to 24 V +10%. In order to
achieve the fastest electronic braking times there must be somewhere for the returned power to go such as:
a supply capable of receiving the returned power
other devices sharing the 24 V bus with the pump
a load resistor of approximately 10
Ω
switched across the 24 V supply when decelerating the pump
1.5
Logic interface
The Podule can only be operated through the logic interface. The signals on the logic interface are of three types:
Control inputs: these are switch-type signals that are used to control the pump
Status outputs: these outputs identify the status of the system
Analogue output: this provides a 0 – 10 V output for a number of pump parameters.
The logic interface has been designed to include both serial and parallel modes of control and monitoring, operating
through one connector. The pump can be operated using either serial or parallel method or some combination of the
two.
The logic interface can be plugged directly into the Edwards TIC Turbo Controller or TIC Turbo Instrument Controller
and then use the functionality that they provide. Alternatively, the logic interface can be connected to a customers
own control system. The most useful arrangements are described in the sections below.
For more information about the logic interface, refer to
1.5.1
Parallel control and monitoring
The simple parallel interface is a quick and easy way to control the pump. This is the same interface used on existing
24V Edwards Turbo Pumps. The controls that are available to use are Start and Standby. The system status can be
monitored using the Normal, Fail and Analogue output signals.
Note:
The Serial Enable switch MUST be open (no connection).
for more detailed instructions of how to use the parallel interface.
A system operating in pure parallel mode has no facility to adjust the configuration settings stored in the Podule (for
example, power limit setting or controlled venting options). This would place a restriction in that all these features
would be at their factory default settings. However, the Podule could be configured separately before fitting the DX
pump to the system. This is covered in more detail in
