Modulating Controller Application Manual
4.1 Supply Pressure Monitoring
Supply pressure monitoring can be included on hydraulic
positional systems to ensure that the hydraulic ring main
pressure is above the required minimum pressure in
order that the actuator can continue to be positioned.
If Supply Px Check is active then the hydraulic supply
pressure transmitter should be linked to Supply Pressure
in order for the supply pressure to be monitored.
If the Supply Pressure drops below Min Supply Px SP for
greater than Supply Px Delay then Low Supply Pressure
output is set active. If Fail On Low SPx is also active then
the actuator will position based on the fault override
settings.
If the Supply Pressure signal is in fault for greater than
Sig Fault Delay then Supply Press Flt is set active. If Fail
On Low SPx is also active then the actuator will position
based on the fault override settings because it cannot be
certain the pressure has not dropped below the
minimum allowable supply pressure.
Whenever the controller is powered on the Controller
On output is set active. This is such that an output can be
provided to confirm that the controller is powered on.
Settings can be changed to affect when the controller
can be in Manual Mode.
If Auto Mode Switch is active then the controller will
instantly revert to Automatic mode. Once in Automatic
mode Auto Mode Switch will automatically reset to off
so that Manual mode can be accessed again.
To prevent access to Manual mode completely, Auto
Mode Switch can be linked to a digital input which can
hold Auto Mode Switch active and prevent access to
Manual mode.
If Man Mode Timer is active then the controller will
revert to Automatic mode if the controller is not in
Automatic mode for a specified time. The maximum
allowable time can be set by changing Max Manual
Time.
NOTE: A minimum manual time is hard set to 2 minutes.
If the Max Manual Time is set to less than 2 minutes
then the controller will revert to Automatic mode after 2
minutes.
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