Absolute encoders applied on sluice door！

Sluice gate control, related to flood control, drainage, water, sewage, through the ship, power generation and other applications, it is increasingly important to control security, and now has been designed to require manual emergency control now with the remote automatic control must be considered individually and For absolute multi-turn encoders use, no longer use the incremental value encoder or single-turn absolute encoder, the industry also has almost standardized. In the past, sluice control, absolute multi-turn encoder mostly selected SSI (synchronous serial) output signal, and now design security requirements, the encounter two difficulties:

One. Two difficulties original SSI encoder

1. SSI signal hand, since the control can not be independent.

    SSI signals clock synchronous serial signal transfer point, the clock signal is sent and received only the same device as the PLC signal, if the encoder signal is connected to the gate opening instruments now, you can not give automatic control, but only by the gate the opening of the instrument and then the output signal to the PLC, so that the reliability of the system are based on the gate opening device, and SSI gate opening instrument high prices, manufacturers of good and bad, there is a big security risk; if the encoder output signal directly to the PLC, only a few European brands PLC have SSI interface, such as Siemens S7-300 (S7-200 will not), so the cost is high, an optional low side, and now manually control signal to rely on automatic control PLC to lose the significance of manual emergency control.

2. SSI signal port can not be inserted into the mine, easier to be damaged.

    SSI signal is "synchronous" serial signal, is not fully synchronized, it transmits the clock to the receiving device by the encoder, the encoder then sends a signal to the receiving device, the internal "sync" comparison, there is a synchronization time difference range requirement, once inserted mine, or cable is longer, the cable is not professional, synchronization signal exceeds the tolerance range, the data will be hopping code, and can not work properly. Our research and development over the past years through SSI mine, in the experimental stage can meet the synchronization error range, under field conditions, are often unable to ensure the synchronization of the SSI signal and hop yards, and had to give up. Unable to join the signal mine, SSI encoders is being broken every year the number of many, including the famous German brand, such as Jiangsu Sanhe, using 63 well-known German brand SSI encoder, broken by lightning each year approximately 3-5 a.

II. Solution absolute encoder dual output signal

    In order to solve the above problems, the Three Gorges hydropower station with two sets of gate opening sensor as a backup, so for most of the gate control is unrealistic. In discussions with the multi-national water resources design institutions and owners, we launched a dual-output true multi-turn absolute value encoder for gate opening instrument's hand, and redundancy control since independence,
    DOX58 ..- L true multi-turn absolute value encoders, the traditional dual signal output 4-20mA and RS485 bus signal, these two signals have almost all the PLC can be connected to the interface, and the connection of the instrument is also available from Most formal instrument manufacturers to find.

Features of this program are as follows:

    1. The encoder is a mechanical gear sets so many turn absolute encoder, DIMENSIONS complete with the original German import the same SSI encoder can be a direct replacement for the installation. Encoder housing protection class IP67, temperature rating of -40 degrees -80 degrees, in line with water conservancy wet, high and low temperature use.

    2. Dual output signal is 4-20mA and RS485, can transmit 400 meters -1000 m (depending on cable), in line with the requirements of direct remote; these two signals has a mature, a lot of mine has been used, the signal port (either the encoder or the receiving device) may play a protective role.

    3. All PLC can have 4-20mA interfaces, most of the PLC can be connected RS485 signal, so for the optional side PLC would greatly increase the cost can be down; and 4-20mA and RS485 signals can also find the standard mature instrument, in order to increase the reliability and reduce the cost of the instrument. PLC and instrumentation, you can choose to use each other 4-20mA signal or RS485 signals.

    4. The encoder signals into the dual manual local control with automatic PLC control, two sets of controls can be used independently, but also with each other redundant control security can be greatly enhanced, while the costs could be reduced. Because you can increase the installation of mine, future maintenance costs for spare parts also declined.

l Absolute Encoder External Diameter:58mm.

l Absolute Encoder Resolution:10-17 bits.

l Multiple Output interfaces absolute encoder.

l IP64.Be able to operate in harsh environment.

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