Four Programmable Set-Ups; Dc Braking; Sleep Mode; Run Permissive - Danfoss VLT Refrigeration Drive FC 103 Design Manual

Product Overview

2.6.10 Four Programmable Set-ups

The frequency converter has 4 set-ups that can be
independently programmed. Using multi-setup, it is
possible to switch between independently programmed
functions activated by digital inputs or a serial command.
Independent set-ups are used, for example, to change
references, or for day/night or summer/winter operation, or
to control multiple motors. The LCP shows the active set-
up.
Set-up data can be copied from frequency converter to
frequency converter by downloading the information from
the removable LCP.

2.6.11 DC Braking

Some applications may require braking a motor to slow or
stopping it. Applying DC current to the motor brakes the
motor and eliminates the need for a separate motor brake.
DC brake can be set to activate at a predetermined
frequency or after receiving a signal. The rate of braking
can also be programmed.

2.6.12 Sleep Mode

Sleep mode automatically stops the motor when demand
is low for a specified time. When the system demand
increases, the frequency converter restarts the motor. Sleep
mode provides energy savings and reduces motor wear.
Unlike a setback clock, the frequency converter is always
available to run when the preset wake-up demand is
reached.

2.6.13 Run Permissive

The frequency converter can wait for a remote system
ready signal before starting. When this feature is active, the
frequency converter remains stopped until receiving
permission to start. Run permissive ensures that the system
or auxiliary equipment is in the proper state before the
frequency converter is allowed to start the motor.

2.6.14 Smart Logic Control (SLC)

Smart logic control (SLC) is a sequence of user-defined
actions (see parameter 13-52 SL Controller Action [x])
executed by the SLC when the associated user-defined
event (see parameter 13-51 SL Controller Event [x]) is
evaluated as TRUE by the SLC.
The condition for an event can be a particular status or
that the output from a logic rule or a comparator operand
becomes TRUE. That leads to an associated action as
shown in Illustration 2.16.
MG16G202
Design Guide
Par. 13-51
SL Controller Event
Running
Warning
Torque limit
Digital input X 30/2
. . .
Par. 13-43
Logic Rule Operator 2
. . .
. . .
Par. 13-11
Comparator Operator
=
TRUE longer than..
. . .
. . .
Illustration 2.16 SLC Event and Action
Events and actions are each numbered and linked in pairs
(states). This means that when event [0] is fulfilled (attains
the value TRUE), action [0] is executed. After this, the
conditions of event [1] is evaluated and if evaluated TRUE,
action [1] is executed and so on. Only one event is
evaluated at any time. If an event is evaluated as FALSE,
nothing happens (in the SLC) during the current scan
interval and no other events are evaluated. This means
that when the SLC starts, it evaluates event [0] (and only
event [0]) each scan interval. Only when event [0] is
evaluated TRUE, the SLC executes action [0] and starts
evaluating event [1]. It is possible to programme from 1 to
20 events and actions.
When the last event/action has been executed, the
sequence starts over again from event [0]/action [0].
Illustration 2.17 shows an example with 4 event/actions:
Stop
event P13-02
Illustration 2.17 Order of Execution when 4 Events/Actions are
Programmed
Danfoss A/S © 08/2015 All rights reserved.
Par. 13-52
SL Controller Action
Start
event P13-01
State 1
13-51.0
13-52.0 State 2
13-51.1
13-52.1
State 4
13-51.3
13-52.3
State 3
13-51.2
13-52.2
Stop
event P13-02
2
Coast
Start timer
Set Do X low
Select set-up 2
. . .
Stop
event P13-02
29
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