Strategy Three; Strategy Four - Danfoss VLT 6000 Manual

Network Outputs fr Network Outputs from the VL Network Outputs fr om the VL om the VL om the VLT 6000:
Network Outputs fr Network Outputs fr om the VL
The points listed in Strategy One are commonly used.

Strategy Three

FLN Function FLN Function FLN Function FLN Function – Monitor drive operation FLN Function – Monitor drive operation – Monitor drive operation – Monitor drive operation – Monitor drive operation
VLT 6000 Contr VL VL T 6000 Contr T 6000 Control ol ol ol ol – From a hard-wired T 6000 Contr
VL VL T 6000 Contr
system, including system feedback
VLT 6000 Mode VL VL VL VL T 6000 Mode T 6000 Mode T 6000 Mode T 6000 Mode – Closed Loop
The VLT 6000 follows hard-wired run/stop
signals.The drive uses its internal PID
controller to control motor speed. The
feedback signal is hard wired to the VLT 6000
analog input and the setpoint is programmed
into the drive. The FLN is used to monitor the
status of the drive and the value of the
VLT 6000 PID controller setpoint and
feedback.
Network Inputs to the VLT 6000: Network Inputs to the VL Network Inputs to the VL Network Inputs to the VL Network Inputs to the VL
FLN is simply monitoring the operation of the drive, it
provides no inputs.
Network Outputs fr Network Outputs fr om the VL om the VL
Network Outputs fr Network Outputs fr Network Outputs from the VL om the VL om the VLT 6000:
to the points listed in Strategy One, it may be useful
to monitor the following points related to the
operation of the VLT 6000 PID controller.
Feedback: Feedback:
Feedback: Feedback: Feedback:
6 0 6 0 INPUT REF INPUT REF
6 0 6 0 6 0 INPUT REF INPUT REF – This is the setpoint for the INPUT REF
VLT 6000 PID controller in units defined in
parameter 415, Units Relating to Closed Loop.
6 2 6 2 PI FEEDBACK PI FEEDBACK
6 2 6 2 6 2 PI FEEDBACK PI FEEDBACK – This is the value of the PI FEEDBACK
feedback signal for the VLT 6000 PID controller
in the units defined in parameter 415.

Strategy Four

FLN Function – Provide the drive with FLN Function FLN Function FLN Function FLN Function
setpoint and feedback values using the VLT
6000 PID controller to determine motor speed
VL VLT 6000 Contr VL VL VL T 6000 Control ol ol ol ol – From the FLN T 6000 Contr T 6000 Contr T 6000 Contr
VL VLT 6000 Mode VL VL VL T 6000 Mode T 6000 Mode T 6000 Mode T 6000 Mode – Closed Loop
The VLT 6000 follows run/stop signals from the FLN.
The FLN receives the feedback signal from the
controlled system. It sends this and the desired
setpoint to the VLT 6000 PID controller. The drive
MG.60.G2.02 - VLT is a registered Danfoss Trademark
T 6000: T 6000: T 6000:
T 6000:
T 6000: Because the T 6000: T 6000: T 6000:
T 6000: T 6000:
T 6000: In addition T 6000:
VLT ® 6000 HVAC
compares the feedback signal with the setpoint and
adjusts the speed of the drive accordingly.
Network Inputs to the VLT 6000: Network Inputs to the VL Network Inputs to the VL Network Inputs to the VL Network Inputs to the VL T 6000: T 6000: T 6000: In addition to T 6000:
start/stop control, which was discussed in Strate-
gy Two, the FLN provides the drive with feedback
and setpoint information using the following points.
Feedback: Feedback: Feedback: Feedback: Feedback:
7 1 7 1 7 1 FB MIN - The VLT 6000 can display the PID FB MIN FB MIN
7 1 7 1 FB MIN FB MIN
controller's setpoint and feedback signal in
units chosen in drive parameter 415, Units
Relating to Closed Loop. The value that the
minimum feedback signal represents can be
set using either point 71 or drive parameter
413, Minimum Feedback.
7 2 7 2 7 2 7 2 7 2 FB MAX FB MAX FB MAX - The VLT 6000 can display the PID FB MAX FB MAX
controller's setpoint and feedback signal in
units chosen in drive parameter 415. The value
that the maximum feedback signal represents
can be set using either point 72 or drive
parameter 414, Maximum Feedback.
7 3 7 3 7 3 7 3 7 3 BUS FB 1 - A value of 0 represents the BUS FB 1 BUS FB 1 BUS FB 1 BUS FB 1
minimum feedback signal, as defined by point
71 or parameter 413. A value of 16383
represents the maximum feedback signal, as
defined by point 72 or parameter 414. This
should be the feedback used if only one
feedback signal is supplied to the drive.
NOTE: NOTE: NOTE:
NOTE: NOTE:
If drive terminal 53 is programmed in
parameter 308, Analog Inputs, for feedback,
any signal applied to terminal 53 is added to value
provided at point 73. Therefore, it is generally
advisable not to program parameter 308 for
feedback.
74 74 74 74 74 BUS FB 2 BUS FB 2 - This is used when two feedback BUS FB 2 BUS FB 2 BUS FB 2
signals are supplied to the drive PID
controller. VLT 6000 parameter 417,
Feedback Function, determines the the
function that the drive applies to these
signals. Functions include minimum,
maximum, sum, difference, and average. A
value of 0 represents the minimum
feedback signal, as defined by point 71 or
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