Audible temperature alarm

NA8820A + controller has a function of signaling exceeding of the temperature above the assumed T max value and below T min.
For parameters :

• U52 : Delay for audible temperature alarm.
• U53 : After power supply , delay for the first alarm signal (0=function disabled).
• U54 : T max Value that is added to the temperature task causing an audible top alarm if : T read >= T set +U54
• U55 : T min Value that is added to the temperature task causing an audible low alarm if : T read =< T set +U53

Below is an example of use:

D1 input:

When NO or NC contacts No.10 and No.7 are shorted or opened while the controller is operating, the symbol "iA" will be displayed on the screen to indicate that the controller is locked in response to an external warning signal, which will cause R1 output to open and the buzzer to sound. Manual contacts, e.g. main switch or other external sensors, e.g. inductive, float, limit, optical, audible, etc. can be used to short circuit or open.

Parameters for input D1 (U60):

• 0: (off) NO normally open state (contacts 7 and 10 must be shorted to trigger the alarm).
• 1: NO - when shorted, locked until the "P" key is pressed
• 2: NO - unlocked automatically after opening the contacts normally closed state NC (to trigger the alarm it is necessary to open contacts 7 and 10)
• 3: NC - locked after opening until the "P" key is pressed
• 4: NC - unlocked automatically after shorting the contacts

U61: Delay for external alarm input D1

Dimensions

Fig. Dimensions of housing, front panel of NA8820A+ controller and dimensions of NTC sensor.


1 Degree of protection IP65 (from the front after mounting in the box)
2 Mounting in a 70 x 28 mm hole, maximum thickness of the board wall 15mm
3 Mounting brackets included

Set includes