Field Settings
880 Operation Manual Issue 7 EMC INDUSTRIAL GROUP LTD Page 24 of 25
• Use the UP and DOWN keys to alter the display to the new minimum value.
• Press EXIT key to return to normal operation.
Loss of Control Timeout
Set Loss of Control Timeout Step 25
The controller continually monitors the kiln temperature in comparison to the con-
trol temperature. It shuts down a firing if the kiln temperature is too high or too low
for a period of time. See alarms
,
,
,
in Alarm
List, page 15.
By default the timer period is 1 hour. This may be made longer or shorter or set to
to disable these alarms.
• Enter Field Setting Mode.
• Press MENU key until the display flashes
.
• Use the UP and DOWN keys to alter the display to the new timeout value.
• To set to press and hold the UP key until display shows
.
• Press EXIT key to return to normal operation.
Note To toggle the setting between 1.00 hour and OFF press both the UP
and DOWN keys together.
Auto Simmerstat
Automatic Simmerstat Temperature For Full Power Step 44
Accurate temperature control between 20°C and 200°C is achieved by using the
automatic simmerstat. Its purpose, to reduce power to the kiln over this tempera-
ture range, prevents the kiln temperature exceeding the Control Temperature by
large amounts.
To control power output the output on to off ratio is changed over a fixed time pe-
riod. The Heat Relay output has a cycle period of 30 seconds and the Heat Logic
output 2 seconds.
When the Control Temperature is about 20°C and heat is called for, the Heat out-
put will be on for approximately one tenth of the cycle period and off for about nine
tenths of the time. As the control temperature rises, the Heat output on time be-
comes longer, and the off time shorter.
At 100°C the on and off times are about equal, while at about 180°C the on time is
about nine tenths of the cycle period and the off time is about one tenth of the cycle
period. Above 200°C the simmerstat action does not work at all and the Heat out-
put will remain on whenever heat is called for.
Note If the kiln temperature equals or is greater than the Control Tempera-
ture, the Heat output will turn off irrespective of the simmerstat action.
The Auto-Simmerstat field setting has been factory set to 200°C.
For applications where the temperature profile does not go beyond 600°C the fac-
tory setting may not allow the kiln to heat up quick enough to follow the desired
temperature profile, in which case the setting may need to be reduced or set to off.
• Enter Field Setting Mode.
• Press MENU key until the display flashes
""
.
• To change the setting use the UP and DOWN keys.
• To set to press and hold the UP key until display shows
""
.
• Press EXIT key to return to normal operation.
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