Danfoss vlt FC 102 Programming Guide

ramps up again and the pressure reaches the set value
(P
set
).
External PID
controller
FC
130BA256.11
P
P
System
P
Set
f
Out
f
Ref
Illustration 3.59 Boost System
2) In systems where the pressure or temperature is
controlled by an external PI controller, the wake-up
conditions cannot be based on feedback from the
pressure/temperature transducer as the setpoint is not
known. In the example with a boost system, the desired
pressure P
set
is not known. Set parameter 1-00 Congu-
ration Mode to [0] Open Loop.
Example: Boost system.
130BA258.10
t
1
p
(Pressure)
Time
Time
No/Low Flow
detected
p
System
P
Set
Sleep mode
activated
P
Ref
= P
Wake
(Frequency)
f
Ref
f
Ref /
f
Out
f
Ref
f
Out
f
Wake
f
Out
Illustration 3.60 Boost System
When low power or low speed is detected, the motor is
stopped, but the reference signal (f
ref
) from the external
controller is still monitored. Because of the low pressure
created, the controller increases the reference signal to
gain pressure. When the reference signal has reached a set
value, f
wake
, the motor restarts.
The speed is set manually by an external reference signal
(remote reference). Use default settings (parameter group
22-3* No-Flow Power Tuning) for tuning of the no-ow
function.
Internal PI controller
(parameter 1-00 Conguration Mode: Closed loop)
External PI controller or manual control
(parameter 1-00 Conguration Mode: Open loop)
Sleep mode Wake up Sleep mode Wake up
No-ow detection (pumps only) Yes – Yes (except manual
setting of speed)
–
Low speed detection Yes – Yes –
External signal Yes – Yes –
Pressure/temperature
(transmitter connected)
– Yes – No
Output frequency – No – Yes
Table 3.26 Conguration Overview
NOTICE
Sleep mode is not active when local reference is active
(press the navigation keys to set speed manually). See
parameter 3-13 Reference Site.
Does not work in hand-on mode. Carry out auto set-up
in open loop before setting input/output in closed loop.
22-40 Minimum Run Time
Range: Function:
10 s* [0 - 600 s] Set the minimum running time for
the motor after a start command
(digital input or eldbus) before
entering sleep mode.
Parameter Descriptions Programming Guide
M0010001 Danfoss A/S © 10/2019 All rights reserved. 205
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Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English