Edwards A705-41-000, Инструкция по эксплуатации

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A705-40-880 Issue B
Page 30 © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
5. Adjust the TCV to the required pump operating temperature; refer to Table 13 for the TCV settings for a pump
operating temperature of 65 °C. For a different pump operating temperature, refer to Section 3.12.4 .
6. Switch on the pump.
7. Check that the pressure shown on the shaft-seals purge nitrogen pressure gauge (8) is between 0.34 and 0.48
bar, above the exhaust back pressure. If you need to adjust the pressure:

Loosen the locknut (14) on the rear of the nitrogen pressure regulator (12).

Turn the adjuster (13) until the required pressure is shown on the pressure gauge.

Tighten the locknut (14).
8. Leave the pump to operate for approximately 60 minutes to allow the pump operating temperature to stabilise.
9. Check that the pump operating temperature is correct. If necessary, adjust the TCV to change the pump
operating temperature (refer to Section 3.12.4 ) and adjust the thermal snap-switch or your ATEX control circuit
for this new operating temperature (refer to Section 3.12.1 and 3.12.2 ).
10. Turn off the pump and the cooling-water and shaft-seals purge nitrogen supplies.
3.12.4 Adjust the TCV (thermostatic control-valve)
CAUTION
Do not adjust the TCV to a lower setting (that is, turn the adjuster knob anticlockwise) when the pump is hot.
This will increase the flow of cooling-water which may damage the pump because of the differential contraction
of the pump rotor and case.
Note: As supplied, the TCV is adjusted for a pump operating temperature of 70 °C (measured at the point shown
in
Figure 1 , item 27). If you adjust the TCV for a different pump operating temperature, you must also
adjust the thermal snap-switch (refer to Section 3.12.1 ) or the trip temperature of the temperature
transmitter control circuit (refer to Section 3.12.2 ).
The minimum pump operating temperatures stated in Table 13 are with a cooling-water flow of 12 l min
-1
and with a cooling-water supply temperature of 20 °C.
The TCV regulates the flow of water through the water cooling system to maintain the pump at the required operating
temperature and is adjustable between 0 (minimum) and 5 (maximum). These TCV settings correspond to the
minimum and maximum pump operating temperatures shown in
Table 6 .
If you need to adjust the TCV to suit your operating conditions, turn the adjuster knob on the TCV ( Figure 4 , item 1)
clockwise or anticlockwise to the position corresponding to your required pump operating temperature. Note that it
takes approximately 60 minutes for the pump to stabilise at its final operating temperature.
Table 13 - TCV settings
EDP80 EDP160 EDP250
EDP400
50 Hz
EDP400
60 Hz
Minimum pump operating
temperature 52 °C 122 ºF 50 °C 122 ºF 50 °C 122 ºF 55 °C 131 ºF 55 °C 131 ºF
Maximum pump operating
temperature 90 °C 194 °F 90 °C 194 °F 90 °C 194 °F 90 °C 194 °F 90 °C 194 °F