When you switch on an iH600 system, the HCDP pump starts immediately, but there is a
delay before the HCMB pump is started. This ensures that the vacuum system and vacuum
inlet pipelines are partially evacuated by the HCDP pump, so that the maximum inlet
pressure for the HCMB pump is not exceeded (see Section 2). As supplied, this delay (the
booster start delay) between HCDP pump switch-on and HCMB pump switch-on is preset to
30 seconds.
You must use the following procedure to determine whether the booster start delay is
suitable for your installation.
1. Switch on the external electrical supply and check that the power ok LED (Figure 1-7, item 7)
goes on. If the LED does not go on, refer to Section 6 to determine the cause of the fault.
2. Logon to the SEM.
3. Use the SEM to:
•
Upload the configuration set from the iH system, and store it with a suitable file name (for
example, "iH600").
•
Edit the configuration to identify that an HCMB pump is not fitted, and save the new
edited configuration set with a suitable new file name (for example, "iH80/600").
•
Download the edited configuration set to the iH system.
4. Switch on the cooling-water and nitrogen supplies.
5. Ensure that the exhaust-extraction system is not blocked (for example, that valves in the
exhaust-extraction system are open).
6. Ensure that all openings to atmospheric pressure in the foreline vacuum system are closed,
then switch on the iH system and simultaneously start the stop-watch.
7. If the iH system starts and continues to operate, continue at Step 8. If a warning or alarm
condition is indicated (for example, a warning or alarm message is displayed on the SEM or
shown on the Pump Display Terminal):
•
Shut down the iH system: refer to Section 5.10.
•
Refer to Section 6 to determine the cause of the fault and to rectify the fault, then repeat this
procedure from Step 7.
8. Look at the pressure gauge in your inlet pipeline:
•
If the pressure is increasing, the HCDP pump-motor terminal-box is incorrectly wired:
immediately shut down the iH system, correct the electrical wiring (refer to
Section 3.16.2), then repeat this procedure from Step 7 again.
•
If the pressure is decreasing, leave the iH system to operate and take note of the time taken
to pump down to 5 mbar (5 x 10
2
Pa), then continue at Step 9.
9. Stop the iH system and isolate it from the electrical supply.
10. Add 10% to the time noted in Step 8, to give the required booster start delay for your
installation.
11. If the required booster start delay is less than or equal to 30 seconds, continue at Step 13.
iH Dry Pumping Systems 3-31
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