© Edwards Limited 2013. All rights reserved. Page 49
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
B722-40-880 Issue F
Note: The second return number is a 32-bit System Status Word (set of 8 hexadecimal characters) which is useful
for fault finding. Refer to Section 5.5.2 for advice on decoding the System Status Word.
4.6 Simultaneous parallel and serial operation
Note: It is not possible to use serial interface monitoring at the same time as running the pump at Standby Speed
in Parallel Interface Mode because the two functions share the same logic interface pins.
The Analogue Output signals are always available irrespective of whether commands are sent in parallel or serial
control mode. The Analogue Output voltages are described in Table 9.
4.7 Operation with a TIC
For operation with an Edwards Turbo Instrument Controller or TIC Turbo Controller, the DX pump can be connected
directly to this type of unit, which will provide the power necessary to drive the DX pump. Instructions on the setup
and operation with the TIC or TIC Turbo Controller can be found on CD ROM part number D397-00-879 which is
supplied with the TIC or TIC Turbo Controller.
4.8 Decelerating and venting
Immediately after applying the stop command, whether by the parallel or serial interface or by the TIC, switch off
the backing pump, then vent the pump in accordance with the advice given in Section 3.8.
Do not open a manual vent valve until the pump rotational speed has fallen below 50%, otherwise the rate of
pressure rise may be too high, which could damage the pump. In an emergency only, open the vent valve quickly
to decelerate the pump rotor in the shortest possible time.
Note: If the Podule is used to control a TAV solenoid valve, there is a 2-second delay between either a Stop
command being received or a fault condition being detected and the vent valve opening. This delay allows
time for gauges, valves and other equipment to be switched off before venting occurs.
The green indicator LED on the Podule will extinguish as rotational speed drops below Normal speed. At very low
speeds, the yellow indicator LED will flash and will extinguish when the pump has stopped.
The deceleration time can be improved by using the Electronic Braking feature, refer to Section 4.5.4.
4.9 Operation at extreme conditions
4.9.1 Operation with high inlet pressure
If the DX pump inlet pressure rises, the power supplied to the pump motor will increase to counteract the gas
frictional load. The pump rotational speed will remain constant until the peak power level is reached; beyond this
level, the speed of the pump will start to reduce.
If the pump speed falls to below 50% of full rotational speed, the Timer will start if it is enabled. If the speed does
not recover to above 50% speed before the time-out period expires, the pump will shut down and display a Fail signal.
If the Timer is disabled, the pump will immediately shut down and display a Fail signal if the speed drops below 50%
of full rotational speed. Refer to Section 2.7 for the maximum power delivered to the pump and to Table 5, for
maximum allowable inlet pressure.
To Next Page
Loading...
Need help?
General
