ABB CL-LMR 18AC2 Series User Manual

Inside the logic relay
228
1SVC 440 795 M0100
The fifth segment is outside of the circuit diagram. The logic
relay uses this to contact the “outside world”: output relays
Q1 to Q… are switched and inputs I1 to “I…” are re-read.
The logic relay also copies all new switch states to the status
image.
The logic relay only uses this status image for one cycle. This
ensures that each rung is evaluated with the same switching
states for one cycle, even if the input signals at I1 to I12, for
example, change their status several times within a cycle.
Evaluation in the circuit diagram and high-speed
counter functions
When using high-speed counter functions, the signal state is
continuously counted or measured irrespective of the
processing of the circuit diagram. (C13, C14 high-speed
up/down counters, C15, C16 frequency counters)
CL operation and implications for circuit diagram
creation
The logic relay evaluates the circuit diagram in these five
segments in succession. You should therefore remember two
points when you create your circuit diagrams:
• The changeover of a relay coil does not change the
switching state of an associated contact until the next
cycle starts.
• Always wire forwards, upwards or downwards. Never wire
backwards.

ABB CL-LMR 18AC2 Series Specifications

General

Rated Voltage	250 V AC
Category	Relays
Output	2 c/o (SPDT) contacts
Terminal Type	Screw Terminal
Contact Configuration	2 c/o (SPDT) contacts
Electrical Life	100, 000 operations
Mechanical Life	10, 000, 000 operations

Summary

Logic relay

Installation

Danger of electric shock

Highlights crucial safety rules to prevent electrical hazards during installation.

Mounting

Connecting the power supply

Explains the procedures for connecting AC and DC power supplies to the logic relay.

Connecting the inputs

Guides on wiring various types of digital and analog inputs to the logic relay.

Connecting outputs

Explains how to connect relay and transistor outputs to loads like contactors and motors.

Commissioning

Creating your first circuit diagram

Offers a step-by-step guide to wiring and creating a basic CL circuit diagram.

Testing the circuit diagram

Wiring with the logic relay

Analog value comparator/threshold value switch

Explains the use of analog comparators for threshold switching and comparing input values.

CL settings

Password protection

Covers setting up password protection for unauthorized access to the logic relay.

Setting date and time

Startup behaviour

Retention (non-volatile data storage)

Explains how actual values and settings are retained after power loss or device reset.

Inside the logic relay

Delay times for inputs and outputs

Monitoring of short-circuit/overload with CL-LST, CL-LMT and CL-LET

Details how to monitor outputs for short-circuits or overloads using internal inputs.

Saving and loading circuit diagrams

Memory module

CL-SOFT

CL-SOFT

Introduces the PC software for creating, storing, test and managing CL circuit diagrams.

What happens if …?

Messages from the CL system

Possible situations when creating circuit diagrams

Provides troubleshooting steps for common issues encountered during circuit diagram creation and operation.

Appendix

Technical data

Contains comprehensive technical specifications covering environmental, mechanical, and electrical data.