MULTICHECK MULTIPLEXER PCB Master Copy for IRTMTCALD by
MULTI-CHECK / MULTIPLEXER PCB Master Copy for IRTMTC/ALD by IRICEN
MULTICHECK SYSTEM • This is a comprehensive fault finding system with a broad spectrum of various type signals. This spectrum covers from malfunctioning of a limit switch to a malfunctioning of PCB. • This cannot be confined to a single panel • It is a combination of systems.
DIFFERENT SECTIONS OF MULTICHECK Parts of Multicheck System I/O PCB Warning Circuit Locking Circuit Ammeter Voltmeter
CURRENT MEASUREMENT SYSTEM Ammeter System Proportional Control Servo Valve LHS Lift. Servo Valve RHS Lift. Servo Valve Lining Tamping Unit Driving Pump Ctrl. Satellite Control
VOLTAGE MEASUREMENT SYSTEM Voltmeter System Digital Measureme nt Multiplex Signals Direct Measureme nt Analogue Measureme nt Power Supply PCBs Various Sections
MULTIPLEXING OF SIGNALS • This is a system by which we can select one signal at a time out of several signals. • 40 signals are the capacity of multiplex PCB used on Plasser’s machines. Generally transducers’ and potentiometers’ signals are connected through this PCB. • Multiplex signal is shown by prefix ‘F’. • On machines two or three digit addresses are used for signal identification.
MULTIPLEX PCB EK-28 V
TWO DIGIT ADDRESS SYSTEM Let address is F ‘XY’ ‘X’ shows selection of Red switch. Value of ‘Y’ may be 0/1/2. ‘Y’ shows selection of Blue switch. Value of ‘Y’ may be 0 to F
THREE DIGIT ADDRESS SYSTEM Let address is F ‘XYZ’ ‘X’ shows selection of PCB. Value of ‘X’ may be 0/1 it is selected by a toggle switch ‘Y’ shows selection of Red switch. Value of ‘Y’ may be 0/1/2. ‘Z’ shows selection of Blue switch. Value of ‘Z’ may be 0 to F
COMMON FAILURES IN PROGRAMMER UNIT • Failure of EK-805 SV or EK-812 SV PCB. • Failure of I/O PCB. • Failure of QL Relay PCB. • Failure of EPROM in Programmer PCB. • Disconnection of ground/earth connections.
COMMON FAILURES IN MULTICHEK SYSTEM • Failure in multiplex PCB: - EK-28 V or EK-207 V. • Failure in Limit Switches. • Failure in Sensors. • Failure in Gauges. • Failure in Logic Relay EL-T 7178. • Malfunctioning of switches.
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