APW Wyott XWAV1829 - Manual (Page 8)

SPECIAL FEATURES
ALARMS
Zone Probe Error
High Temperature Error
· Heater probe is disconnected or defective
· Normal user interface operation applies, but heater output remains inoperative
· Display flashesAlarm LED as well as anAlarm ID:
o AL1 for Zone 1 (Bottom probe)
o AL2 for Zone 2 (Top, probeA)
o AL3 for Zone 3 (Top, probe B)
· Alarm shuts down all outputs
· Probe must be replaced or re-connected to allow normal use
· Heater element is too hot, most likely due to external SSR that failed short
· Display flashesAlarm LED as well as anAlarm ID:
o AL4 for Zone 1 (Bottom probe)
o AL5 for Zone 2 (Top, probeA)
o AL6 for Zone 3 (Top, probe B)
· Alarm shuts down heater regulation.
· The alarm threshold temperature is Low-level programmable
· Algorithm:
o In normal use, if temperature ever goes above (set point + threshold), High Temperature
Error is immediately triggered.
o If set point is changed (lowered) by the user, the unit will look at the current temperature for 2
minutes and display HI. The peak temperature reached during this time is recorded.
o Thereafter, unit monitors the temperature until it reaches set point. During this cooldown
time, standard HI message is still displayed. User may change set point again, but 2-minute
timer is restarted (and old Peak value still applies.)
· During the cooldown time, if ever the temperature rises the previously recorded peak
temperature, High Temperature Error is triggered.
· Once set point is reached, rdy is displayed again.
· HI is displayed only if other zone is rdy or also HI. If other zone is Lo, then LH (low-high) is displayed
instead of HI.
not
above
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