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Appendix C - RS-232 REGEN Responses
C-4
P/N 8040406
C
HELIX TECHNOLOGY CORPORATION
-
TI
CRYOGENICS
M,N, c*, d*, o*
COOLDOWN
This display shows the actual second stage temperature and the target
temperature which is always 17K. The command is: K actual tem-
perature
Example of Display:
COOLDOWN 125K/17K
P
Regeneration complete
U*
Begin Fast regeneration
V
REGENERATION ABORTED
If regeneration is aborted, the reason for this can be determined by
using command e. The responses and descriptions are listed below:
@ - No error
A,B - WARM-UP TIMEOUT - Did not reach warm-up temperature
within 60 minutes.
C - COOLDOWN TIMEOUT - Did not cool down within 5 hours.
E - ROR CYCLE LIMIT WAS REACHED - The pump did
not pass the rate-of-rise test within the programmed cycle limit.
F - MANUAL ABORT - Someone manually gave the
command to stop regeneration.
G - ROUGH VALVE TIMEOUT - Rough valve was opened
for more than 1 hour without closing.
I* - Not cooled <50. Start of Fast regeneration not allowed because
the pump is too warm.
Table C-1: RS-232 REGEN Responses and Descriptions (Continued)
REGEN Response
Description