Omron E5AZ, User Manual

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74
Using the SP Ramp Function to Limit the SP Change Rate
Section 4-7
Setting the Set Point Lower-limit Value
Operating Procedure Set Point Lower Limit =
−
100
4-7 Using the SP Ramp Function to Limit the SP Change Rate
4-7-1 SP Ramp
The SP ramp function is used to restrict the width of changes in the set point
as a rate of change. When the SP ramp function is enabled and the change
width exceeds the specified rate of change, an area where the set point is
restricted will be created, as shown in the following diagram.
During the SP ramp, control will be performed not for the specified set point
but rather for the set point restricted by the rate of change set for the SP ramp
function.
The rate of change during SP ramp is specified using the “SP ramp set value”
and “SP ramp time unit” parameters. The “SP ramp set value” parameter is
set to OFF by default, i.e., the SP ramp function is disabled.
Changes in the set point during SP ramp can be monitored in the “Set point
during SP ramp” parameter (operation level). Use this parameter when moni-
toring SP ramp operation.
The SP ramp function operates in the same way when switching the set point
using the multi-SP function.
2. Select the “set point upper limit” parameter.
3. Use the
U
and
D
keys to set the parameter to 1000.
C
sl-h
1300
Set point upper-
limit
C
sl-h
1000
1. Select the “set point lower limit” parameter in the initial setting level.
2. Use the
U
and
D
keys to set the parameter to
−
100.
C
sl-l
-200
Set point lower
limit
C
sl-l
-100
SP
SP ramp
SP after change
SP before change
Point of change
Time
SP ramp
set value
SP ramp time unit (s/min)