MTL BPHM64 power supply backplane

Description

MTL BPHM64 power supply backplane

MTL BPHM64 power supply backplane

More than 32 field loops

For larger installations, the system should probably be based on the BPHM64 HART interface – see Section 4.2. This unit will accommodate one MTL4841 communications module and up to four MTL4842 multiplexer modules to accommodate a total of 64 signals. However, the MTL4841 can manage a total of 16 MTL4842 modules, i.e. 256 signals, so three more BPHM64 carriers can be linked to the first, each fitted with four MTL4842 modules. Further expansion is possible by repeating this structure up to 30 times. The overall method is illustrated in Figure 2.1. See Section 5.3.1 for configuration details.

BPHM64 HART backplane

For medium to large scale installations, the BPHM64 HART backplane is the method of choice to handle the HART maintenance signals passing to and from the field devices.

Mounting

The BPHM64 is designed for mounting in a control room equipment cabinet and is supplied fitted on a carrier suitable for T or G section DIN-rail mounting in any orientation. Weight (excluding modules): 296g Weight (per module) 100g approx. Footprint dimensions: See Figure 4.2 Height (modules fitted): 116mm from top of DIN rail.

HCU16 HART connection unit

The HCU16 HART connection unit – see Figures 4.4 & 4.5 – provides a connection interface between the field wiring and the onward link to the host/system control for non-hazardous areas. It also provides a take-off point for the HART signals to the maintenance system. Connections to the field signals and the system are via screw-clamp terminals and the link to the BPHM64 is via a 20-way ribbon cable. Each channel has three terminals: +ve, -ve and a transmitter supply terminal (Tx +) – see Figure 4.5. The HART signal has to be terminated with an impedance of approximately 240W. Positions are provided on the circuit board to fit parallel resistors (normally 250W), or an appropriate series resistor to raise the impedance if it is < 240W. This unit can be used with analogue outputs if the system’s current signal is compatible with HART communications. The HCU16 is supplied fitted in a carrier for DIN rail mounting. The footprint of the carrier is 150 x 125mm and the height from the top face of T-section DIN rail is approximately 55mm.

The water level regulation of the steam drum in the water supply regulating system (i.e. automatic water supply) is the most important regulating circuit in the circulating fluidized bed, and it is also one of the automatic regulating circuits that must be put into operation in the entire control system. The purpose of the water supply regulation system is to maintain the stability of the water level inside the boiler drum by controlling the water flow rate of the boiler, causing it to fluctuate slightly above or below a certain set value, effectively reducing the heavy workload caused by manual water level control by operators. The feedwater control system of this circulating fluidized bed boiler consists of two sets of automatic regulation systems: main feedwater regulation and feedwater bypass regulation. The feedwater bypass regulation control system adopts a single impulse regulation method, which controls the output of the feedwater bypass regulating valve through the deviation between the actual value of the steam drum water level and the set value. This automatic system is generally put into use when the boiler load is less than 30%; The main water supply regulation is divided into two control methods: single impulse regulation and three impulse regulation. The control switching between single impulse regulation and three impulse regulation is achieved by the system after judging the operation of the boiler, without human intervention. This automatic system is generally used when the boiler is at high load (i.e. the load is greater than 30%).

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