8937-HN MTL 8937-HN Power Control Module

Description

8937-HN MTL 8937-HN Power Control Module

8937-HN MTL 8937-HN Power Control Module

Certification

The SafetyNet Controller is certified for use in safety-related applications up to and including SIL 2. The SafetyNet Controller achieves this Safety Integrity Level with a 1oo1D architecture (i.e. it operates in “simplex” mode, with correct operation ensured by comprehensive internal diagnostics). In such applications the SafetyNet Controller is used in conjunction with the 8811-IO-DC SafetyNet Digital Input/Output Module and the 8810-HI-TX SafetyNet Analog Input Module with HART*. The SafetyNet Controller is mounted on its dedicated Carrier 8751-CA-NS. *First release of SafetyNet will not have full HART capability.

Safe by design

The SafetyNet Controller has been designed specifically for safety-related applications and is certified on the basis of the excellence of its design. It does not depend for its certification on “proven in use” data.

Diagnostics

If the SafetyNet Controller’s internal diagnostics detect a fault that would prevent the SafetyNet System from carrying out its safety function, then it will initiate a controlled shutdown. A controlled shutdown has two objectives – firstly, to ensure that the SafetyNet System enters its failsafe mode; and secondly, to record sufficient data to allow the reason for the shutdown to be determined. If a SafetyNet Controller enters a controlled shutdown, then all communication with IO Modules is stopped and – when the programmed time delay for each IO module has elapsed – they will enter their safe states.

System size

The SafetyNet Controller can interface with up to 64 locally mounted, 8-channel IO Modules – giving a total capacity of over 500 channels per node. The Ethernet LAN is capable of supporting over 200 nodes, giving a maximum theoretical capacity of over 100 000 channels!

HART pass-through

SafetyNet Controllers can be configured to allow transparent access to the process variables and status information provided by HART field instruments. HART data cannot be used within the SafetyNet application (as – for example – it does not employ sufficiently rigorous data error detection algorithms), but communication with such devices can be achieved by using a “passthrough” command which does not involve, nor interfere with, the safety application. (The first release of SafetyNet will not have full HART capability, contact MTL for further information).

One of the main reasons for using DCS in the automatic regulation control system for circulating fluidized bed boilers is to address the complexity of operational control. The design of a relatively excellent analog quantity adjustment control circuit can effectively control the adjustment action of the on-site executing mechanism, thereby safely and efficiently controlling the operation of the boiler combustion system. The circulating fluidized bed boiler is a control object with multiple parameters, variables, strong correlations, and disturbances. Its automatic control system is both independent and interrelated, which can be described as “pulling one engine to move the whole body”. After a system is regulated, other regulatory systems also need to undergo corresponding changes. The regulation and control system of this boiler has designed several automatic regulation circuits, involving multiple aspects such as steam temperature regulation, negative pressure regulation, water level regulation, coal feeding regulation, and combustion regulation, fully meeting the operational control requirements of the circulating fluidized bed.

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