Electronic Load Limiter

LOADGUARD

The LOADGUARD is an electronic load limiter with redundant weight control by reading up to two independent signal inputs, from the load cells or load pins. Its output relays act according the alarm programming, weight differences between channels or system failures. The main applications are in the control and overload protection in lifting equipments, cranes and machinery.

Ref. Versions

89147LOADGUARD OPTO
89148LOADGUARD ANALOG OPTO

Specifications

  • In compliance to standard EN 13849-1:2008, PL-d, category 3, corresponding to Safety Integrity Level SIL 2 IEC 62061.
  • 2 weighing inputs for load cells, connected to two independent ADC and two independent microcontrollers.
  • Connection up to 4 load cells of 350 Ω per channel (8 load cells of 700 Ω per channel).
  • 4 control relays: Alarm thershold, pre-alarm thershold, maximum load difference between channels and load cell cable break detection.
  • Display 4 digit 7mm LED and 4 keys for configuration, setting and status messages.
  • Weighing functions: Weight display, full scale and division settings, zero calibration, gain calibration by mass or mV/V, auto-zero, zerotracking and programmable filters.
  • Optionally available with dual 4-20mA analogue outputs, redundant, one per weighing channel.

Technical Specifications

Load cell connection
Scale input singal range -+3.9 mV/V
Input sensitivity 0.2 microV
Resolution Internal 24 bits and external up to 10.000 divisions on the payload
Linearity error <0.01% measuring range
Thermal stability <0.002% F.S./°C
Resolution Category II
Load cell excitation voltage 87 Ω (4 load cells of 350 Ω, 8 load cells of 700 Ω, per channel)
Outputs:
Logical outputs 4 relay (max 48V DC/AC)
Analogue output (Optional) 2 outputs 4-20mA (1 per channel) of 16 bits of resolution
Power, working condition and mechanical data:
Power supply 10V to 30V DC
Maximum consumption 6W
Temperature range -20 °C to +50 °C de operating; -20 °C to +60 °C storage
Mounting DIN rail, IP20
Operator interface Display: 4 LED digit 7mm; Keyboard: 4 keys

Technical Documentation

ES EN DE FR RU
Data Sheet
EU Declaration of Conformity
Certificate ISO 13849
Instalation Manual LOADGUARD
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