Edwards 30B5M, Instruction Manual, Page: 30 / 50

B064-04-880 Issue F
Page 22 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
1. Measure the insulation resistance (at 500 V d.c.) between any of the heater terminals ( Figure 1 , items 13) and
earth (ground). Then:

If the insulation resistance per heater is greater than 1 M

, you can switch on the pump.

If the insulation resistance per heater is less than 1 M

, continue at Step 2 below.
2. Remove the heaters from the pump (refer to Section 5.7 ). Bake the heaters in an oven at a temperature of
120 ºC for 12 hours or more.
3. Remove the heaters from the oven. Measure the insulation resistance of each heater:

If a heater has an insulation resistance greater than 1 M

, you can refit the heater to the pump.

If a heater has an insulation resistance less than 1 M

, repeat Steps 2 and 3 of this procedure. If the
insulation resistance of a heater is less than 1 M

after the heater has been baked for 24 hours, then the
heater is faulty and you must replace it with a new heater.
4.3 Pump start-up
Note: If you do not have an RCCB in your electrical supply circuit, you must check the insulation resistance of the
heaters as described in
Section 4.2 before you switch on the pump.
The following procedure is recommended when the pump and your vacuum system are at atmospheric pressure.
1. Refer to Figure 7 . Close the vacuum system isolation-valve (3) and the vacuum system air-admittance valve (4).
Close any other openings to atmospheric pressure.
2. Switch on the cooling-water supply to the 30B5M pump.
3. Switch on the holding pump (11, if fitted), then switch on the backing pump (8).
4. Open the holding valve (12, if fitted), then open the backing valve (7).
5. On unconfigured pumps, when the backing pressure reaches 10 mbar (1 x 10
3
Pa) or lower, switch on the
electrical supply to the pump heaters. Initially, the backing pressure will increase due to the outgassing of the
pump fluid. Continue at Step 8.
On control configured pumps, continue at Step 6.
6. Refer to Figure 2 . Ensure that the Heater Power switch on the control-box (3) is in the off position and then use
the isolator (4) to switch on the electrical supply to the pump.
7. When the backing pressure reaches 10 mbar (1 x 10
3
Pa) or lower, press the Power Enable switch ( Figure 2 ,
item 1) and make sure that the Power Enable lamp ( Figure 2 , item 2) goes on. Then, move the Heater Power
switch ( Figure 2 , item 3) to the Full position. Initially, the backing pressure will increase due to the outgassing of
the pump fluid.
8. Allow the pump to warm-up for about 1 hour so that it reaches its operating temperature.
9. Check that the backing pressure is below the critical value for the pump fluid being used, then close the backing
valve (7) and open the roughing valve (5).
10. When a system pressure of less than 2 mbar (2 x 10
2
Pa) is reached, close the roughing valve (5) and the holding
valve (12, if fitted), open the backing valve (7) and open the vacuum system isolation valve (3) to start fine
pumping using the 30B5M.