Gardner Denver XMX Series, Инструкция по установке

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GARDNER DENVER
Model XMX Demand Expander
Page 9
©Copyright 2005-2013
Gardner Denver Corporation
Version 4.10
Derivative-
By pressing OK, the value is accepted and the screen advances to the DERIVATIVE set display.
It is not recommended that the derivative value is set to any value above zero. If the system has
wide swings in demand and the valve is not keeping up, the derivative function biases the control
based on the rate of pressure change. It can be increased slowly in order to assist with valve
control. This is very rare however.
Derivative Set Point Screen
When the OK button is again pushed, the screen will return to the overview display providing the
actual system pressure and valve position. The system is ready for operation.
Optional Back Pressure Control:
The standard controller has an optional software routine that will provide forward pressure control
with overriding back pressure protection. The Demand Expander must be order with a normally
closed valve. Both P3 and P4 pressures must be connected and set points for both forward
pressure and back pressure must be entered. When selected, by the installation of a jumper
b24 VDC and I/1 on the processor’s input terminals, the software automatically adjusts
and the screen navigation reflects the added set point entry requirements and pressure displays.
Pressure will alternate between P3 and P4 pressure on the overview display and valve position
will reflect the actual valve output signal in percent.
Alternating Overview Screens
The main overview screen will alternate between the P3 and P4 pressure readings and provide
the valve position as calculated by the controller.
REMOTE
XMX DEM EXP
DERIVATIVE
= 0
REMOTE
XMX DEM EXP
P3 PRESS = 85
VALVE % = 92
REMOTE
XMX DEM EXP
P4 PRESS = 92
VALVE % = 92