41
Reference Handling
Reference handling is shown in the block diagram at the bottom of this
page. The block diagram shows how a change in a parameter can
affect the resulting reference.
Parameters 203 to 205, Reference Handling, Minimum and Maximum
Reference, and parameter 210, Reference Type, define the way
reference handling can be carried out. These parameters are active both
in closed loop and open loop operation.
In closed loop operation, the resulting reference is affected by param-
eters 418 and 419, Setpoints, as well as by remote references.
Remote references can be:
-
external references, including analog inputs 53, 54 and 60; pulse
references through terminals 17 or 29 and references from serial
communication.
-
preset references.
The resulting reference can be shown in the display as a percentage
by selecting Reference [%], or as a unit by selecting Reference [unit]
in parameters 007 through 010. The sum of the external references
can be shown in the display in a percentage of the range from
Minimum Reference to Maximum Reference. Select External
Reference, [%] in parameters 007 through 010 Display Readout if a
readout is required.
It is possible to have both internal preset references and external
references at the same time. In parameter 210, Reference Type, a
choice is made of how the preset references are to be combined with
the external references.
An independent local reference exists, where the resulting reference is
set by means of the + and - keys. In all cases, the output frequency
range is limited by parameter 201, Output Frequency Low Limit, and
parameter 202, Output Frequency High Limit.
CAUTION
!
If local reference is active, drive is
always in
Open Loop, regardless of choice made in pa-
rameter 100,
Configuration.
The unit of the local reference can be set either as Hz or as a
percentage of the output frequency range. The unit is selected in
parameter 011, Unit of Local Reference.
203
Reference Handling
(REFERENCE SITE)
Value:
★
Hand/Auto linked reference
(LINKED TO HAND/START)
[0]
Remote controlled reference (REMOTE)
[1]
Local reference (LOCAL)
[2]
✭
Indicates default parameter. Depending upon the application, the drive may be delivered with other parameters selected.
