New overload monitor,stable load weight indicator,moment limiter for tower crane
New overload monitor,stable load weight indicator,moment limiter for tower crane:
Structure:
This product is composed of two parts by the bearing pressure sensor and control instrumentation , with digital display from the weight and automatic overload alarm and cut off the crane lifting loop power function . Applicable to the bridge carne and gantry crane equipment .
Advantages:
Compared with other similar products , this products have many characteristics , eg : high cost performance , economic , good reliability , easy install .
New overload monitor,stable load weight indicator,moment limiter for tower crane data.
1.Use scope:3-75T bridge carne and gantry crane
2.Action error : ≤3%（F.S）
3. Integrated display error: ≤5%（F.S）
4.Setting of alarm point :
①Preliminary alarm point :90% of rated lifting weight
②Delayed alarm point : 105% of rated lifting weight.
5.Delayed alarm time:1-2 s
6.Overlaod capacity of sensor : 1.5times
7.Operating environment temperature: -20℃- +60℃
8.Power: 220V or 380V （±10%）50HZ ( If use other power , pls mark out )
9.Relay contact rating: 220V15A/380V10A
10.Protection rating of sensor: IP65
11.Protection rating of control cabinet: IP42
New overload monitor,stable load weight indicator,moment limiter for tower crane working principle.
The sensor output signal is amplified by the two integrated operational amplifier, the amplified signal is fed to a four comparator, wherein three separate comparator comparison with different reference voltages, respectively, its baseline were set at 90% of the nominal value, 105%, comparator action of the pre-alarm buzzer intermittent sound, light yellow, but to control the relay does not work, it does not limit the crane lifting. When the load reaches 105% of the set point comparator action, to avoid starting shock load caused instant false overload, set a delay circuit, delay of 1-2 seconds, it is determined if the overload persists, really overloading, immediately cut off the lifting motor power, the red indicator light. Execution control relay to DC relay, the relay does not operate when normal lifting. The device control relay contacts in series in the the crane hoisting control loop, overload control relay action, lifting loop cut, cranes stop lifting job, but the job does not affect the other direction, the circuit two The group DC power supply: ± 6V for sensor and secondary instrument, ± 8V for weight digital display.
New overload monitor,stable load weight indicator,moment limiter for tower crane.
2. Lifting, the upper and lower positions weighing numerical slight difference is caused due to the length of rope on the drum is inconsistent, but integrated error required is less than 50% FS.
3.The device is limited from the overload protection, measurement scales generally do not make use of.
4. The device fall safety protection device, but not equipped with this device two ignore safety procedures
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