Danfoss VLT AutomationDrive FC 361 Programming Guide

2) Systems where the integrated PI controller is used for
controlling pressure or temperature, for example boost
systems with a pressure feedback signal applied to the
frequency converter from a pressure transducer.
1. Set parameter 1-00 Conguration Mode to [3]
Process.
2. Congure the PI controller for reference and
feedback signals.
e30bg833.10
P
f
Out
p
Set
FC
P
System
Illustration 4.51 Sleep Mode Function
Digital input
enabled
p(Pressure)
Time
Time
P22-45 x
P22-44 x
Sleep mode
activated
Boost
activated
P
Boost
P
Set
P
Wake-up
f
Ref
f
out
(Frequency)
P
System
e30bg836.10
p
System
= p
Wake-up
P
Set
P
Set
P
Ref
f
O
ut
Illustration 4.52 Sequence Diagram
If the dierence between pressure reference and feedback
is smaller than the threshold, the boost function activates,
which means the frequency converter increases the
setpoint for pressure to ensure a slight overpressure in the
system (the boost is set in parameter 22-45 Setpoint Boost).
The feedback from the pressure transducer is monitored.
When this pressure has dropped with a set percentage
below the normal setpoint for pressure (P
set
), the motor
ramps up again. The pressure is then controlled for
reaching the set value (P
set
).
External PI controller or manual control
(parameter 1-00 Conguration Mode: Open loop)
Internal PI controller
(parameter 1-00 Conguration Mode: Closed loop)
Sleep mode activated Wake up Sleep mode activated Wake up
Pressure/temperature
(transmitter connected)
– – Yes Yes
Output frequency Yes Yes – –
Boost function – – Yes –
Sleep mode enable External DI signal (parameter group 5-1* Digital Inputs)
Table 4.21 Conguration Overview
The goal of the boost function is to keep the frequency converter in sleep mode as long as possible to avoid cycling the
motor on and
o frequently, and also keep the controlled system variable within the acceptable range. Boost is only to be
used when parameter 1-00 Conguration Mode is set to [3] Process, and the integrated PI controller is used.
NOTICE
Sleep mode is not active when local reference is active (set speed manually with the navigation keys on the LCP). 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.
Parameter Descriptions Programming Guide
MG06J202 Danfoss A/S © 03/2019 All rights reserved. 155
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Danfoss VLT AutomationDrive FC 361 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 361
Category	DC Drives
Language	English