699Plus digital instrument for load weighing devices
The 699Plus is a digital instrument for measuring, displaying, and controlling the load in a lift cabin, with visualization on a 4-digit high-brightness display. For controlling loads, it is possible to freely set up to 3 intervention thresholds for the relays in the unit, each of which can be connected as Normally Open (NO) or as Normally Closed (NC). The 699Plus load weighing device is suitable for new lifts and for the modernization of old installations, being easy and fast to install, reliable over time and at a good price.
Automatic zeroing reset functions of the measurements, catenary compensation with relay blocks while the car is moving, and the possibility of using a calibration procedure (MANU) with sample weight or a sample weight-free calibration (AUTO) procedure are available, going to call up calibration profiles for S2Tech production sensors that are defined on a statistical basis with test campaigns carried out in our laboratories using the most commonly available rope samples that can be found on the market.
It is possible by means of the relays, to pilot warning lights and alarms for the indication of overloads in the cabin (default threshold value of 110% of the nominal load), as well as indicating the presence of load conditions close to the nominal system limit (default value 80% of nominal load) to the plant system controller or of the exhaust plant system (default threshold value 5% of the nominal load). It is moreover possible to order the device with the analog (voltage or current) output (SINK type), which is proportional to the load present in the cabin – so as to control the starting torque of the winch and achieve an improvement in the comfort of the plant.
It is moreover possible to request a digital output – optional – for the connection of the measuring system to a remote controller.
Connections are available for RS485 lines – with a Modbus protocol – or CAN lines, with a CANopen protocol (CiA 406 implemented profile) or CANopen-Lift (CiA 417), or proprietary CAN protocols.
At the end of each calibration, the instrument verifies the quality of the calibration performed by the installer by reporting fault conditions related to electrical or procedural wiring errors (through error codes for easy assistance) that could affect the quality of the measurement. All data is stored in EEprom memory, so you do not have to rely on backup batteries, to the benefit of the reliability and durability of the instrument. For added security there is also a relay test mode, which the installer can use when needed.
The displays of this series are designed and manufactured in Italy, with EMC testing carried out with third-party laboratories in order to validate the product against the effect of electrical disturbances that might be present in the lifts of modern design. Before delivery, each instrument is individually tested with a calibration with a reference load cell to verify all different measuring functions of the device.
It is possible to connect this series of strain gauge sensor displays that have been specifically designed by S2Tech to be installed on lifts or with load cells or pressure transducers for industrial applications where automatic control of the forces or loads being applied is required.
There are several different product configurations for connecting the sensor to the instrument through RJ11 connectors, through a screw terminal, or in order to permit the connection to up to 8 S2Tech production transducers by means of Minifit connectors. In order to guarantee the maximum reliability, the electrical connection systems have always been chosen that are fitted with retaining connectors, in order to avoid unintended disconnections, to the detriment of the effectiveness of the load control system.
The instrument can be supplied as a simple printed circuit for integration into the machine’s electrical control panel, or supplied with a robust metal housing that makes it possible to mount it in a difficult condition from a mechanical point of view.
There is a 4-button keyboard for programming the unit, LEDs for indications of the power supply and relay status and two opto-isolated digital inputs for remote activation of the measuring instrument. The analog output and digital output may be installed, as options, at the same time and are fully configurable by the User.
The 699Plus series instruments find their application as load limiters on lifts or other industrial lifting systems for theatrical applications, on machines, weighing systems (fixed or on board the vehicle) and industrial applications.