Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...

B800-00-880 Issue B
2.10 Indicator LED’s
The nEXT pump has three indicator LED’s, shown in Figure 12.
LED
Normal LED
Status LED
Alarm LED
Table 13 - Indicator LED’s
Description
This green LED remains on all the time that the pump
rotational speed is above the Normal speed setting,
irrespective of whether the pump is accelerating or
decelerating.
This yellow LED flashes with a 50% duty cycle at the
rotational frequency of the pump motor. At high speeds
it appears continuously on.
The LED switches off when the rotational speed is very
low or stopped.
If a service is due, this LED flashes in a sequence to
indicate which service operation is required. Refer to
Section 5.5.
This red LED flashes in a sequence to indicate an error
code if a fail condition is preventing pump operation.
The error codes can be used for fault finding as
described in Section 5.5.
Technical data
Note:
If an external electrical load is connected to the Normal output line, the Normal LED may illuminate.
2.11 Operating and storage environment
Table 14 - Operating and storage environment
Range
Data
Ambient operating temperature range 5 °C to 40 °C
Ambient operating humidity range
10 to 90% RH (non-condensing)
Maximum operating altitude
3000 m
Ambient storage temperature range -30 °C to 70 °C
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