Instruction manual

46
Operation Method
Independent overheating prevention device
There are two safety devices in this unit: the auto-overheating preventive function of the
controller (automatic recovery) and the independent overheating prevention device (manual
recovery). Circuits and sensors that are independent from the controller configure them.
These safety devices for the temperature overheating prevention protect the instrument in a
fail-safe method.
Setting the Temperature Range and Function
Setting
Temperature
Range:
10 to 1990℃
Input Method:
Three integer digital switch. Turn the dial of each column and set the desired
value. The first integer as the left can only be from 0 to 3 for the hundred
columns.
The device of FP series works in ten times of the set value.
For example, it works at the temperature of 1010℃ if the dial is set to “101” ,and
1110℃ if set to “111”.
Function:
Heater output is cut off when the measured temperature gets higher than the set
temperature of the independent overheating prevention device. The function is
active when the earth leakage breaker is ON.
When the independent overheating prevention device is activated, Er.07 blinks on
the main indicator with the ERROR lamp blinks.
Activation/Setting Method
 Usually, set the temperature 100℃ higher than the set temperature of the controller.
 In the case of the program operation, set it at least 100℃ higher than the maximum set
value of the temperature pattern of the program.
 When the independent overheating prevention device is activated improperly by the next
reasons, changing the setting of the device lower than the internal temperature, or by
continuing operation when the setting of the device is too low, turn off the earth leakage
breaker to reset the main unit and perform the setting again. If it is activated by another
reason, refer to the Page 53 “Function of safety devices”.
CAUTION!
Precautions
 Only 0 to 3 can be set for the column of hundreds of the digital switch by the stop
mechanism; however, if forced to change it to a value higher than 3, it will damage the unit.
(Actually
, The first integer as the left is a value of thousand.)
 Set temperature can change by touching the dial when cleaning. Always confirm that the
set temperature is correct after cleaning or before operation.