EVCO c-pro nano RACK - Manual (Page 66)

C-PRO NANO RACK E C-PRO MICRO RACK APPLICATION MANUAL
Page 66
6.7 Various management issues
6.7.1 Digital input or supervisor setpoint variation
It is sometimes important to reduce the energy consumption of the compressors or the noise level of the fans
(for example at night).
The program foresees, both for compressors and fans, the possibility of managing a parameter, PUC1 (PUC2)
offset secondary setPoint compressors and PUF1 (PUF2) offset secondary setPoint fans, which, based on the
state of a digital input (different for compressors and fans), sums an offset to the main setpoint in order to allow
it to vary. It is possible to set the logic for the digital input by acting on the parameter PH19 Logic Other DI
(the same parameter for the logic of the digital input on/off).
To set this function, the parameter PH25 enable secondary digital input setpoint must be activated and the
position in which the digital input related to the compressors and the one related to the fans will be connected
must be set. If this value is not set, the function will remain disabled.
Similarly, activating the parameter PH26 enable secondary supervisor setpoint, it is possible to use the relative
offsets both for the compressors and for the fans.
6.7.2 Manual function
The program makes it possible to set a manual function for compressors and fans. In this state, the devices do
not participate either in the rotations or in the calculation of thermo-adjustment, though they are still sensitive to
possible alarms.
The manual functioning of the devices is useful when functional tests must be run on the machine to test
integrity and proper functioning.
Compressors
The manual functioning or lack thereof of the compressors is guaranteed by the parameter PM1x enable
compressor:
- If it is set to the Auto value, it defines the normal functioning of the device
- If it is set to the Manu value, it disables the compressor and leads to manual functioning.
A compressor that is functioning manually does not participate in the adjustments and may be forced into the
number of steps that it is able to supply by acting on the property PM2x compressor forcing (present in the
menu Maintenance -> Forcing of Compressors). The number of steps that a compressor functioning manually
can supply is limited to the number of throttlings that have been set in the configuration of the machine.
As was stated previously, the compressor is in any case still sensitive to alarms and related consequences.
To restore the compressor to normal use, the parameter PM1x enable compressor must be reset to the Auto
value, otherwise the compressor in question will continue to function manually and will not heed the turn-on
and/or shutdown requests calculated by the adjustment set.
Fans
The manual functioning or lack thereof of the fans is guaranteed by the parameter PM5x enable fan:
- If it is set to the Auto value, it defines the normal functioning of the device
- If it is set to the Manu value, it disables the fan and leads to manual functioning.
A fan that is functioning manually does not participate in the adjustments and may be forced to turn on/shut
down by acting on the property PM6x fan forcing (present in the menu Maintenance -> Forcing of Fans).
As was stated previously, the fan is in any case still sensitive to alarms and related consequences.
To restore the fan to normal use, the parameter PM5x enable fan must be reset to the Auto value, otherwise the
fan in question will continue to function manually and will not heed the turn-on and/or shutdown requests
calculated by the adjustment set.