Evco c-pro nano RACK User Manual download pdf (Page 55)

C-PRO NANO RACK E C-PRO MICRO RACK APPLICATION MANUAL

Page 55

6.4.3 Protection timings

Below, there is a list of all the timings related to the management of the compressors.

Neutral Zone Timings

These parameters serve to adjust the time intervals of the requests for turn-on and shutdown of the various steps

supplied by the compressors:

Minimum time request for turn-ons

Maximum time request for turn-ons

Minimum time request for shutdowns

Maximum time request for shutdowns

For these parameters, refer to the description in paragraph 2.2.2.

Protection timings

These times serve to protect the mechanical instruments from the various breakaways to which they are

subjected.

PC04 – Minimum time turn-on of compressors. Once activated, the compressor will stay on for this amount of

time before it can be shut off.

PC05 – Minimum time shutdown of compressors. Minimum amount of time that must pass after the last

shutdown before the compressor can be turned on again.

PC06 – Minimum time between turn-ons of same compressor. Establishes the minimum amount of time that

must pass between two turn-ons of the same compressor.

PC07 – Minimum time between turn-ons of different compressors. Establishes the minimum amount of time

that must pass between the turn-on of one compressor and the next. If enabled, this serves to avoid

simultaneous breakaways.

PC08 – Minimum time between shutdowns of different compressors. Establishes the minimum amount of time

that must pass between the shutdown of one compressor and the next.

PC09 – Minimum time turn-on of throttlings. Establishes the minimum amount of turn-on time between the

throttlings of a compressor.

PC10 – Minimum time shutdown of throttlings. Establishes the minimum amount of shutdown time between the

throttlings of a compressor.

PC27 (PC47) – speedUp time. If adjustment with inverter is set, this parameter, if different from zero, allows

the inverter output to remain at maximum level (100.00%) at each request for the turn-on of a new step.

6.4.4 Safety inputs

The program foresees the management of 1 safety “thermal compressor” input for each compressor. For this

input, it is possible to set the type of reset (automatic or manual) and the intervention delay, through the use of

parameters.

To enable the alarms related to these safety measures, besides setting the parameters mentioned above as

needed, it is also necessary to set the positions in which the digital inputs will be connected relative to the

various types of alarm from the menu Constructor -> Hardware. In the case where there is no wish to set the

alarm, all that is needed is to set the parameter mentioned above to the value of 0.

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Evco c-pro nano RACK User Manual Page 55