Hypertherm HPR260 Manual Gas Preventive Maintenance Program Rev.5 - Manual (Page 150)

MAINTENANCE
5-6 HPR260 Auto Gas Instruction Manual
5
Gas system purge cycle
When the system is turned on, or the operator changes from one cut process to another, the system automatically goes
through a purge cycle. The purge cycle has 2 stages; a preflow purge and a cutflow purge.
The preflow gas flows for 8 seconds with an auto gas console, or 12 seconds with a manual gas console.
The cutflow gas flows for 8 seconds with an auto gas console, or 12 seconds with a manual gas console.
There are 2 exceptions to the cycle described above.
Exception 1 – if the operator changes from a non-fuel gas process (O
2
/Air, Air/Air, or N
2
/Air) to a fuel gas process
(H35/N
2
, or F5/N
2
) or the reverse, there will be 3 stages to the purge process. Nitrogen will purge the
gas system first, for 12 seconds. The preflow and cutflow purges will follow the nitrogen purge.
Note: error code 42 (low nitrogen gas pressure) will be displayed, if nitrogen is not connected to the gas system. If
error code 42 is not resolved in 3 minutes, it will be replaced by error code 139 (purge time-out error).
Exception 2 – no purge cycle will occur if the operator changes from any cut process to a nitrogen marking process.
Gas system valve usage
The following tables show which valves are active for each cutting process.
O
2
/O
2
process
Metering console
control board
Selection console control board
LED
number
38 39 28 37 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Preflow B4 B2 SV1 SV3 SV8 SV10
Cutflow B3 B1 SV1 SV3 SV8 SV10
O
2
/Air
process
Metering console
control board
Selection console control board
LED
number
38 39 28 37 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Preflow B4 B2 SV1 SV3 SV8 SV10
Cutflow B3 B2 SV1 SV3 SV8 SV10
N
2
/N
2
process
Metering console
control board
Selection console control board
LED
number
38 39 28 37 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Preflow B4 B1 SV9 SV11
Cutflow B4 B1 SV9 SV11