Caution

Cut off all power before maintenance.

The maintenance includes:

• cleaning of the housing and terminal blocks from dust, dirt and derbis
• checking the device fastening
• checking the wiring (connecting leads, fastenings, mechanical damage)

Notice

The device should be cleaned with a damp cloth only. No abrasives or solvent-containing cleaners may be used.

Calibration is intended to restore the metrological characteristics of the device in case of their change after prolonged use or repair work and consists in selecting the minimum and maximum values of the output signal.

Danger

Calibration of the device should be carried out only by qualified specialists of metrological services.

Calibration is carried out only for analog outputs. To do this:

• connect the load (R_load) and a voltmeter to the output according to Figures (for output of type У) and (for output of type И);
• apply power to the device.

Notice

As R_load, you can use the resistance box P4831 or similar with an accuracy class of not more than 0.05, and as a voltmeter, a device with an accuracy class of not more than 0.05, for example, B1-12.

0 is displayed – the device is in operating mode.

The calibration algorithm for analog output:

1. By changing the DAC code and controlling the current (voltage) at the output of the analog device, to achieve the value of the output signal corresponding to the lower limit of the output current or voltage (in general, 4 mA or 0 V).
2. Commit the current DAC code as the lower desired limit of the signal at the output of the analog device.
3. By changing the DAC code and controlling the current (voltage) at the output of the analog device, to achieve the value of the output signal corresponding to the upper desired limit of the output current or voltage (in the general case, 20 mA or 10 V).
4. Commit the current DAC code as the upper desired current limit at the output of the analog device.
5. Set APPLY parameter to YES.
6. Exit the calibration menu.

Notice

To apply the calibration parameters, you need to edit both LdAC and HdAC.

Calibration can be carried out using the service menu of the device or via the RS-485 network.

The commands used when calibration over the RS-485 network are given in Appendix (section “Calibration”).

Set the LdAC and HdAC parameters to achieve that the value of the output signal corresponds to a lower or upper desired limit of the output current (voltage). The first submission of these commands is considered the implementation of paragraphs 2 and 4 of the calibration algorithm, respectively.