Up-Down Ramp - Honeywell EXCEL 5000 User Manual

EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE

UP-DOWN RAMP

Function As an input varies between a minimum value and a maximum value, vary an output
on a time-delayed basis.
I/O Dialog Box
Inputs Max = output maximum (input or parameter)
Inp = Input to be ramped
Min = output minimum (input or parameter)
Minimum and maximum input values impose limits on the output value.
Outputs Out = ramped output
Separate up and down ramp time parameters are provided in the internal
parameters dialog box.
On controller power-up, the output is set based on Parameter 3:
P3=0 output set to minimum limit
P3=1 output set to current input (within min-max limits)
P3=2 output set to maximum limit
P3=3 output set to value of Parameter 4 (within limits)
The rate of change of the output is a function of the span between the Min value, the
Max value, and the up and down ramp times. Subtract the Min value from the Max
value and divide the result by the appropriate ramp time to determine the rate of
change. To select a particular rate of change, first establish the desired Min and
Max limits, then divide the difference between these two limits by the desired rate of
change to get the up or down ramp parameter values.
Internal Parameters
91 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)