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CLL
Control Units

CLL

COLM® overload control unit for lifting systems

Digital load limiter and transmitter for lifting systems. CLL monitors up to two load cells, limits the load with pre-alarm and alarm thresholds and enables speed stages depending on the load. Set-up and calibration are carried out via the 5-key keypad or the COTO COLM® app for Android and iOS.

2load cell inputs
4relay outputs
PL dEN 13849-1, Cat. 2
106×106mm, DIN rail

Overview

Designed for Omega/DIN rail mounting in the back panel or a junction box, with a compact 106 × 106 × 43 mm body (terminal blocks included) and a 6-digit display.

Key Features

Inputs / Outputs & Communication

  • RS485/RS232 serial ports for continuous one-way ASCII transmission
  • 4 relay outputs: three changeover + one safety changeover relay with guided contacts
  • 2 independent load cell inputs
  • 2 digital inputs, 2 selectable analog inputs, 2 selectable analog outputs
  • CANbus and Modbus
  • Integrated RF interface for connecting multiple units (option)
  • LED indicators showing relay output status; 5-key keypad
  • Alarm signal on load cell connection failure

Load Limiting

  • Load limitation by alarm and pre-alarm thresholds
  • Single and summed load limitation for systems with up to 2 weighing points by connecting multiple units
  • Lifting operation counters
  • When the load is below the set nominal value, the 3rd and 4th relays enable operation at the 3rd and 4th speed levels

COLM® App Functions

  • Calibration and tare via iOS / Android app
  • Individual configuration of the four relay outputs
  • Gyroscope or anemometer input
  • Communication with frequency inverters via Modbus
  • Recording of overvoltage, overcurrent, over-temperature and inverter fault codes
  • Real-time recording of overload events and lifting cycles
  • Real-time recording of weighing results with product-type information
  • Export of records in Excel or PDF format and report printing

Main Functions

  • Connection to PC/PLC via RS485/RS232
  • Connection to a remote display via RS485/RS232
  • Up to 2 load cells in parallel via junction box
  • Connection to other units for the summing function via RS485 or RF (option on request)
  • Continuous load cell connection integrity check
  • Digital filter to reduce the effects of load oscillation
  • Theoretical calibration (via keypad) and real calibration (with sample weights)
  • Tare weight zero setting
  • Automatic zero setting at power-on
  • Gross weight zero tracking

Ordering Code

ExampleCLL-1-1-2-1-M-1-J
CLLProduct family 1Function 1Data transfer 2Relays 1Load cell inputs MCommunication 1Wireless JOptional input
  • Control unit
  • 1 – Overload
  • 2 – COLM via app
  • 0 – None
  • 1 – USB Type-C
  • 2
  • 3
  • 4
  • 1
  • 2
  • M – Modbus
  • I – 4–20 mA
  • V – 0–10 V
  • C – CANbus
  • 1 – None (cable)
  • 2 – Bluetooth
  • 3 – Wi-Fi
  • J – Gyroscope
  • W – Wind sensor

Technical Specifications

Power supply and consumption24–250 VDC/VAC; 6 VA
Number of load cells • Load cell supplyup to 2 (350 Ω) • 10 VDC
Linearity< 0.01% full scale
Thermal drift< 0.002% full scale / °C
A/D converter24 bit
Measuring range±3.9 mV
Conversions per second3
Decimals • Display increments0÷4 • x1 x2 x5 x10 x20 x50
Digital filter0.25÷3 Hz
Relay outputs4 changeover relay outputs – 30 VDC / 250 VAC; 2 A
Opto-isolated digital inputs2
Serial portsRS485, RS232
Baud rate1200, 2400, 9600, 19200, 38400, 57600, 115200 bit/s
Humidity (non-condensing)85%
Storage temperature−30 °C … +60 °C
Operating temperature−20 °C … +55 °C

Certifications & Compliance

  • CE certification for European Union countries.
  • Category 2 as per EN 13849-1, PL d (comparable to SIL 2 level, EN 62061) (LCD3PL).
  • Lead (Pb) free.

Options on Request

CED-3X / CED-4X

IP54 aluminium 6-digit external display with RS232/RS485 communication. 3": 6 × 76 mm LED, 620 × 150 × 100 mm; 4": 6 × 102 mm LED, 770 × 150 × 100 mm.

CLP / CLW

IP66 pin type and wire rope type load cells, standard 4G0.22 mm² 3.5 m cable.

RF

Integrated RF interface for connecting multiple units: 2.4 GHz (128 channels), average range 100 m.

The company reserves the right to change technical data, drawings and images without prior notice.

CLL

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