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Post Requirements
Post Requirements
Product information
CLG-SL Load limiter is an electronic device able to control the load of the crane (or another machine) through a pressure transducer and limits the operations that would cause an overloading and/or an overturning of the machine, acting on the bypass valve.
The product is also available for the measurement of the differential pressure between two pressure transducers, always mounted in the main boom of the crane (“CLG-D” version).
Overall dimensions: 138 x 110 (147 with connector) x 38 mm
Drilling interaxis: 119 x 99 mm (n° 4 screw M5)
Features
Power supply range: from 10Vdc, up to 30Vdc.
Connector FCI, 24 ways, IP68, mechanical polarization, easy locking cam.
Maximum output current supply: 3A
According to EN 954-1 Safety Standards: Category 2
Two different working areas with two different load limits.
Fast and easy programming sequence.
Human-machine interface
The green led on the board, in normal operation mode, is lighten to show the power supply.
When faults are present, the green led blinks following a particular sequence related to the fault reasons.
Also, a LED bar graph allows to see the load percentage in real time, compared to the maximum load. When
the load exceeds the 100% of the limit, red LED of the bar graph blinks.
Leds placed into the emergency button box (red colour and yellow colour), are lighted in the following situations:
- When emergency button is pressed, the red and the yellow blink together.
- When the load exceedes the 90% of the limit, yellow led is ON.
- When the load exceedes the 100% of the limit, red led is ON.
The CLG-SL load limiter is able to control a Bar LED in order to signal when load exceed the 90% and 100% of maximum permitted load.
Inputs
- RESET: That input allows the load limiter to power the valve ELV1 for a short period, even if the load value exceeds the load limit. During this time, the user is able to move the machine in order to return into a safety position. Working conditions are not monitored when reset functionality is enabled, user is responsible for possible machine damage.
- LIMIT REDUCTION (critical working area): It is useful when a working area is more critical than other: when its value is low, a reduced pressure threshold is used.
- INCREASE THRESHOLD (optional): that input has to be coupled with first boom descent maneuver. When input value goes high, the load limit threshold is increased by a fixed value (specified in a configuration parameter), in order to offset the pressure increase due to overcenter valves which operate during this maneuver.
- PRESSURE transducer input: 4÷20 mA.
- INPUT DV: It allows to connect the load limiter to a remote control in a safety way.
- DIFFERENT POWER SUPPLY for powered outputs, which includes a disconnect relay with feedback control. Emergency button can be connected to this input.
Outputs
- Powered output to drive bypass valve coil. The board implements a feedback current control on the mentioned output.
- Two powered output to drive external optional lamps. The mentioned outputs are driven as well as the leds into emergency button box (90% and 100%).
Parameter setting by final user
The load limiter's thresholds are programmed using an external, little, 4 buttons keyboard. The keyboard is an optional. Its name is "PRG-CLG". When it is connected the green led blinks four times in a second.
The PRG2 (either CLG version or DEC version) can be used even to increase the load limit threshold up to 125%, for a brief period of time.
In order to increase the limit: when you connect the PRG2, the "+" button has to be pressed within 5 seconds then kept pressed till the green led blinking will become slower.
![[Second-hand] laser](https://cdn.sumecdtx.com/equipment/20230818/928f9346aceb42e3b60670c380399f59.jpg)
