MTL5991 Power Adapter MTL

Description

MTL5991 Power Adapter MTL

MTL5991 Power Adapter MTL

The MTL5991 provides a convenient source of power for MTL5000 range units in locations where a dc supply is not readily available. The 2A capability at 24V dc is sufficient to drive at least fifteen (15) MTL5000 range of modules, or more in appropriate combinations (see table 6.16), and the wide mains power supply range makes this unit universally applicable.

Using the terminal assignments shown in figure 6.81, make the following tests and checks.

1. Connect a supply voltage of between 85V and 264V ac to the live and neutral terminals. Check that the voltage measured across these terminals is within the range 85V to 264V ac.

2 With no load connected to the unit’s output, measure, in turn, the voltage between terminals 4 and 6 then 5 and 7. Check that the measurements are in the range 23.64V to 24.36V.

3 Connect to the output, a load that draws up to 2A from a supply voltage between 105V and 264V ac, and draws 1.7A when the supply voltage is less than 105V ac. Measure, in turn, the voltage across terminals 4 and 6 and 5 and 7. Check that these measurements are in the range 23.64V to 24.36V with a ripple not greater than 100mV.

The MTL5995 is a general purpose power supply unit designed for use in 31.25kbit/s (H1) fieldbus systems. The MTL5995 complies with the requirements of Fieldbus Foundation™ power supply Type 131 (non-IS supply intended for feeding an IS barrier).). To allow adequate heat dissipation under all likely thermal conditions, it is recommended that MTL5995s are installed on DIN rail with a 10mm space between adjacent units. MTL MS010 10mm DIN-rail module spacers are available for this purpose (see section 4.2.1).

To comply with fieldbus standards, each bus must be terminated at both ends. MTL’s FBT1-IS or FCS-MBT fieldbus terminators (see section 6.37) can be supplied for this purpose or, for installations in which the MTL5995 is located at one end of the fieldbus trunk, it includes an internal terminator which is enabled by a yellow switch (B) located on the base of the unit (see figure 6.82). A second, red switch (A) in the base of the unit should be kept in the normal mode position.

This is a mode developed to address the implementation of DCS control at the field control level.
This method uses an industrial computer as the upper computer of the Intelligent Precipitator Computer Control System (IPC system) for electrostatic precipitator, with each high and low voltage control equipment as the lower computer. The IPC system collects the operation data and working parameters of each lower computer through communication, and manages and controls the operation of each lower computer. Meanwhile, the IPC system is then connected via Modbus_ The RTU mode communicates with the DCS host to achieve the purpose of monitoring the high and low voltage equipment of the electrostatic precipitator by the DCS host. Through this method, DCS can fully penetrate into various subsystems, such as monitoring the operation mode of high-voltage equipment, specific faults, monitoring the rapping cycle, rapping conduction angle, etc.

Modbus is a widely used communication protocol in industrial sites, adopting a Master/Slave structure. In a control network, the host is generally unique, with up to 255 slaves, each with a unique address identifier. DCS serves as the host and IPC system as the slave. Both parties physically connect through RS485 bus, and explicitly use Modbus communication protocol and RTU transmission mode to define the slave address and communication port and parameter configuration used by IPC industrial control computer. At the same time, the IPC system defines detailed specifications for the address, name, parameter range, data width, and other related data transmission lists between the IPC system and DCS according to specific engineering projects. The IPC system returns the content of the corresponding data entry or performs corresponding operations based on the starting address and number of data points in the DCS message. Based on these requirements, a communication interface program between the IPC system and DCS has been specially developed and designed to determine the communication port, receive interrupt requests from DCS, and respond in a timely manner. DCS can create an interface that is consistent with the entire system based on the returned data to monitor the operation of the electrostatic precipitator.

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