Evco c-pro nano RACK User Manual download pdf (Page 65)

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

Page 65

Protection timings

These times serve to protect the fans from the various breakaways to which they are subjected.

PF07 – Minimum time between turn-ons of different fans. Establishes the minimum amount of time that must

pass between the turn-on of one fan and the next. If it is set, it makes it possible to avoid simultaneous

breakaways.

PF08 – Minimum time between shutdowns of different fans. Establishes the minimum amount of time that must

pass between the shutdown of one fan and the next. If it is set, it makes it possible to avoid simultaneous

breakaways.

PF27, PF47 – speedUp time. If inverter adjustment is set, this parameter, if different from zero, makes it

possible for the inverter output to remain at the maximum value (100.00 %), each time that the turn-on of a new

fan is required.

6.6.3 Safety inputs

The program foresees the management of a single “thermal fan” safety measure for each of the fans configured

in the application. The activation of this characteristic is managed by the parameter PG32 enable fan safety.

To enable the “thermal fan” alarms, besides setting the appropriate parameter, the positions in which the digital

inputs related to the various fans selected will be connected must also be set using the menu Constructor ->

Hardware. If there is no wish to set the alarm, it is sufficient to set the parameter mentioned above to the value

of 0.

6.6.4 Inverter configuration

For each inverter used in the plant must be selected also the related digital output position for the

command/consent at the inverter start; For the configuration the same parameters of the fans digital outputs are

used, parameters HF01, HF02, HF03, HF04. The inverter is virtually the first fan of each circuit; this means

that, depending of the fans and circuits number, the right parameter must be set, by following below logic:

⋅ Signle Circuit: The inverter (if enabled) is virtually the fan 1; it is neccessary to configure the parameter

of the first fan, this means that parameter HF01 must be always configured.

⋅ Two circuits: The inverter of circuit 1 (if enabled) is virtually the fan 1 (this means that parameter HF01

must be configured), and the circuit 2 inverter (if enabled) is virtually the first fan after the circuit 1

fans.

Inverter consent with PWM

In some applications it can be necessary to command the consent of the inverters with a PWM output

configuring 0% or 100%. To use this option is necessary to operate with the same logic used in the previous

examples on the parameters HC0x, configuring the values according this rule:

HC01 = 13 -> Defines that the PWM output on the controller is used for the consent

of the fan with inverter circuit 1

HC0x = 14 -> Defines that the PWM output on the controller is used for the consent

of the fan with inverter circuit 2

Note. Configuring the value 13 or 14, the related PWM is used, this means that the possibile parameters HC31,

HC32, HF31, HF32 should not be configured as PWM.

The choice and the configuration of the fan inverters parameters is the same for the compressors, but the

parameters PH21, HF01, HF02, HF03 and HF04 are used (look at paragraph 6.4.5)

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Evco c-pro nano RACK User Manual Page 65