Operation of Controller
880 Operation Manual Issue 7 EMC INDUSTRIAL GROUP LTD Page 14 of 25
Alternatively the controller can be set to stop firing when power returns and show
at what stage during the firing power failed. The firing must then be either manually
restarted, or cancelled.
Firing Auto Continues When Power Returns
To automatically resume firing when power is restored, the Auto Continue field set-
ting must be set &. See Auto-Continue page 23.
If power failed during the delay start count down or at any other time during the fir-
ing, the program will automatically resume and continue from where it left off when
power returns. The ALARM light flashes to indicate there has been a power failure.
Note this is the only alarm where the internal beeper does not sound and, if option
OP-1 relay card is fitted, the Alarm Relay contacts do not close.
Press the ALARM CANCEL key to clear the alarm. When this key is pressed and
held, the display will show the alarm number
)* confirming a power failure
occurred.
NOTE If power failed during the hold period of a stage, the controller auto-
matically resumes firing in the ramp section of that stage. This en-
sures that the kiln temperature is brought back to the hold tempera-
ture at a controlled rate. Once the kiln is back at hold temperature, the
controller resumes holding for the remaining hold time.
Firing Does Not Resume When Power Returns
To prevent firing resuming when power is restored, the Auto Continue field setting
must be set . See Auto-Continue, page 23.
When power returns, the ALARM light and display flash and the internal beeper
sounds to indicate that a power failure occurred. The small display shows during
which program stage power failed, eg for Hold 2, or will show if it happened
through the delayed start. The large display shows the current kiln temperature.
If option OP-1 relay card is fitted, the Alarm Relay contacts close to sound an ex-
ternal alarm device if fitted.
Press the ALARM CANCEL key to mute the beeper and open the Alarm Relay
contacts. While pressing this key, the display will show alarm number
)*
confirming fault was a power failure.
To continue with the firing, press the RUN STOP key. To cancel the firing, press
the RUN STOP key a second time.
NOTE If the MENU key is pressed, from the time power is restored after a
failure up until the RUN STOP key is pressed, its function will be ig-
nored and if the CONTROL TEMP key is pressed during this time the
large display will show .
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