Comparators
Comparators are used for comparing continuous variables
(output frequency, output current, analog input, and so on)
to fixed preset values.
Par. 13-11
Comparator Operator
=
TRUE longer than.
. . .
. . .
Par. 13-10
Comparator Operand
Par. 13-12
Comparator Value
130BB672.10
Illustration 2.18 Comparators
Logic rules
Combine up to 3 boolean inputs (TRUE/FALSE inputs) from
timers, comparators, digital inputs, status bits, and events
using the logical operators AND, OR, and NOT.
. . .
. . .
. . .
. . .
Par. 13-43
Logic Rule Operator 2
Par. 13-41
Logic Rule Operator 1
Par. 13-40
Logic Rule Boolean 1
Par. 13-42
Logic Rule Boolean 2
Par. 13-44
Logic Rule Boolean 3
130BB673.10
Illustration 2.19 Logic Rules
The logic rules, timers, and comparators are also available
for use outside of the SLC sequence.
For an example of SLC, refer to
2.6.15 Safe Torque Off Function
The frequency converter is available with Safe Torque Off
(STO) functionality via control terminal 37. STO disables the
control voltage of the power semiconductors of the
frequency converter output stage. This in turn prevents
generating the voltage required to rotate the motor. When
the STO (terminal 37) is activated, the frequency converter
issues an alarm, trips the unit, and coasts the motor to a
stop. Manual restart is required. The STO function can be
used as an emergency stop for the frequency converter. In
the normal operating mode when STO is not required, use
the regular stop function. When using automatic restart,
ensure the requirements of ISO 12100-2 paragraph 5.3.2.5
are fulfilled.
Liability conditions
It is the responsibility of the user to ensure personnel
installing and operating the STO function:
•
Read and understand the safety regulations
concerning health, safety, and accident
prevention.
•
Have a good knowledge of the generic and safety
standards applicable to the specific application.
A user is defined as:
•
Integrator.
•
Operator.
•
Service technician.
•
Maintenance technician.
Standards
Use of STO on terminal 37 requires that the user fulfills all
provisions for safety including relevant laws, regulations,
and guidelines. The optional STO function complies with
the following standards:
•
EN 954-1: 1996 Category 3
•
IEC 60204-1: 2005 category 0 – uncontrolled stop
•
IEC 61508: 1998 SIL2
•
IEC 61800-5-2: 2007 – STO function
•
IEC 62061: 2005 SIL CL2
•
ISO 13849-1: 2006 Category 3 PL d
•
ISO 14118: 2000 (EN 1037) – prevention of
unexpected start-up
The listed information and instructions are not sufficient
for a proper and safe use of the STO functionality. For full
information about STO, refer to the
VLT
®
Safe Torque Off
Operating Instructions
.
Protective measures
•
Qualified and skilled personnel are required for
installation and commissioning of safety
engineering systems.
•
Install the unit in an IP54 enclosure or in an
equivalent environment. In special applications, a
higher IP degree is required.
•
The cable between terminal 37 and the external
safety device must be short circuit protected
according to ISO 13849-2 table D.4.
•
When external forces influence the motor axis (for
example, suspended loads), to eliminate potential
hazards, additional measures are required (for
example, a safety holding brake).
Product Overview
VLT
®
Refrigeration Drive FC 103
30
Danfoss A/S © 08/2015 All rights reserved.
MG16G202
2
2
Содержание VLT FC 103
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