Danfoss VLT HVAC Drive FC 102 Design Manual page 203

Basic Operating Principles ...
LCP Keys Parameter 3-13 Reference
Site
[Hand On] Linked to hand/auto
[Hand On]⇒(Off) Linked to hand/auto
[Auto On] Linked to hand/auto
[Auto On]⇒(Off) Linked to hand/auto
All keys Local
All keys Remote
Table 11.1 Local and Remote Reference Configurations
11.2.2 Remote Handling of References
Remote handling of reference applies to both open-loop
and closed-loop operation. See Illustration 11.3.
Up to 8 internal preset references can be programmed into
the drive. The active internal preset reference can be
selected externally through digital control inputs or
through the serial communications bus.
External references can also be supplied to the drive, most
commonly through an analog control input. All reference
sources and the bus reference are added to produce the
total external reference. The active reference can be
selected from the following:
•
External reference
•
Preset reference
•
Setpoint
•
Sum of the external reference, preset reference,
and setpoint
The active reference can be scaled. The scaled reference is
calculated as follows:
Y
Reference = X + X ×
100
Where X is the external reference, the preset reference, or
the sum of these references, and Y is parameter 3-14 Preset
Relative Reference in [%].
If Y, parameter 3-14 Preset Relative Reference, is set to 0%,
the scaling does not affect the reference.
MG16C302
Design Guide
Active
Reference
Local
Local
Remote
Remote
Local
Remote
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