Error C3 Too low sensitivity during self test

Compur Statox 4120

Error C3 (Too low sensitivity during self test):

S3/3 on the control module offers the option to choose if C3 shall be a maintenance request (position ON) or system failure (position OFF).

The system failure messages A1 and C3 (both defined as SF):

The sensor head still transmits measured values to the control module, but these measured values will not be displayed on the bar graph display nor be transmitted to the analog output. For safety reasons they will still be compared to the alarm thresholds and an alarm will be activated if they are exceeded. Also the sensor protection feature will be activated if the measuring range is exceeded.

Mounting the maintenance request pcb

Connect the the pcb to the 5 contact terminal on the Statox 4120 rack backplane. (see pic. 10). Shorting plugs program the analog output to 4-20 mA or 0-1V (see pic.12). Ex works setting is 4-20 mA.

As an option the 4-20 mA output can be set to 0 mA during the self test, the alarm threshold programming and when the diagnostic box is connected (measured value not valid).

On the terminals 1 to 8 the relays MR and PCS as well as the analog signal can be accessed. The maximum load of the relays is 24V/100mA.

Service mode control module

Set the service switch on the control module (S3/7) to „OFF“ to simulate the mode „normal“, „WB“ and „PCS”. Select by the following keys:

Key	mode	Relay PCS	Relay WB	Analog signal	Reading
T	Detection mode	passive	passive	4 mA / 0V	0%
A1	Self test/Maintenance,	active	passive	4 mA / 0V	50%
	Adjusting A1 und A2
A2	Maintenance request	passive	active	20 mA / 0V	100%

Compur Statox 4120