33
Bit 0
In Shut Down State
Bit 1
Alarm Sounding
(Relay 4 Active)
Bit 2
In Alarm State
(Sound may have been SILENCED)
Bit 3
Alarm SILENCE prohibited *
Bit 4
Relay 1 Active
Bit 5
Relay 2 Active
Bit 6
Relay 3 Active
Bit 7
Relay 4 Active
(Duplicates Bit 1)
* Note that in certain configurations, the ALARM relay may be used to initiate an
automatic run down of a magnet. In this case the SILENCE button is prevented from
disabling the alarm, since the run down process must not be cancelled unintentionally.
8.2.1
Example Sequence
The sequence which follows shows the status messages returned from a typical
instrument during normal operation.
The instrument is an ILM
211
211
211
211
. We will assume that the nitrogen level remains constant at
100% throughout the sequence and will follow the effects of variation in helium level
through an autofill sequence. The instrument is configured via test t.05 as follows:
Channel 1
166
( = 2 + 4 + 32 + 128 )
Channel 2
1
Channel 3
0
The configuration number for channel 1 is made up of four elements, as indicated,
corresponding to:
Pulsed Helium Level operation
Autofill using the Channel Relay (i.e. Relay 1 since this is channel 1)
Alarm sounds and Relay 4 active for a LOW condition
Automatic FAST / SLOW rate switching implemented
(Refer to section 9.7 for full details of all the configuration parameter options.)
The configuration number for channel 2 corresponds to a nitrogen level indicator with
no autofill or alarms implemented and the number for channel 3 corresponds to an
unused channel.
We assume that the level thresholds for channel 1 are at their default settings, with LOW
= 10%, FILL = 20% and FULL = 90%.
Initially we assume that the helium and nitrogen levels are both at 100%.
STATUS
MEANING
X210S040000R00
Helium & Nitrogen Operating Normally. Helium in SLOW rate.
X210S050000R00
Helium Probe Current is on for a measurement pulse.
X290S040000R00
The Nitrogen Probe has been un-plugged.
X210S040000R00
The Nitrogen Probe has been re-connected.
