Edwards nEXT240, Instruction Manual

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© Edwards Limited 2009. All rights reserved. Page 65
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
B800-00-880 Issue A
Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode the
System Status Word, each bit is numbered (starting with 0 for the least significant to 31 for the most significant) as
shown below.
Table 29 contains a list of the lower 16 status flags that will be useful for fault finding. The upper 16 status flags are
reserved by Edwards.
Binary digits
Bit numbers
The System Status word used in the example above was obtained with the pump at rest. By decoding the word, we
can learn more about the state of the pump. Refer to
Table 30 .
0 0 1 0 0 0 1 0 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0
                               
3
1 3
0 2
9 2
8 2
7 2
6 2
5 2
4 2
3 2
2 2
1 2
0 1
9 1
8 1
7 1
6 1
5 1
4 1
3 1
2 1
1 1
0
9 8 7 6 5 4 3 2 1 0
Table 29 - Status flags
Bit number Status flag Active flags means
0 Fail Fail status condition active
1 Stopped speed Below stopped speed
2 Normal speed Above normal speed
3 Vent valve closed Vent valve energised
4 Start Start command active
5 Serial enable Serial enable active
6 Standby Standby active
7 Half full speed Above 50% full rotational speed
8 Parallel control mode Exclusive control mode selection
9 Serial control mode Exclusive control mode selection
10 Invalid Controller software Controller internal software mismatch
11 Controller upload incomplete Controller failed internal configuration and calibration
operation
12 Timer expired Failure to reach or maintain half full speed within the
timer setting value
13 Hardware trip Overspeed or Overcurrent trip activated
14 Thermistor error Pump internal temperature measurement system
disconnected or damaged
15 Serial control mode interlock Serial enable has become inactive following a serial
Start command.
Table 30 - Example decoding of system status words
Bit number
Status of bit
(in example)
We can deduce
0 0 The pump has not failed
1 1 The pump is at rest
2 0 Speed is below normal speed