Elemer RMT 49D - Article System and Work

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5. ARTICLE SYSTEM AND WORK
5.1. RMT set includes:
• power supply transformer unit with linear stabilizers;
• impulse power supply unit;
• analog-digital converter АDC (one for each measuring channel);
• microprocessor block;
• indication and keyboard module;
• digital-to-analog converters module,
• recording device with a linear electric motor, recording device and servo amplifiers
(one for each measuring channel);
• tape driving mechanism with a speed changing system for plotting paper moving;
• twelve executive relays of the signaling system (four for a measuring channel);
• module of the interface RS 232 to connect with the computer.
5.1.1. The power supply transformer unit will transforms the mains voltage 220V in not
stabilized +8V, +17V and stabilized +5V,
±
5V,
±
12V, supplying all electronic units, except for
АDC. The switch of supplying is not stipulated, as RMT is intended for continuous mode working.
5.1.2. The impulse power unit transforms not stabilized voltage of +8V in stabilized
electrically untied couple voltage of +5V, supplying ADC modules.
5.1.3. ADC transforms an input analog signal into a code arriving at the microprocessor
through an optical interconnection.
5.1.4. The microprocessor block, by results of ADC interrogation, calculates the current
significance of the measured quantity, displays it on the indicator, interrogates the keyboard,
manages the modules of digital-to-analog converters and interface RS 232 and the executive relay.
5.1.5. The executive relays are switched on (are switched off) at the measured quantity exit out
of limits of bottom I, II and top III, IV setting .
Setting values are entered by the keyboard or on COHM port and are displayed on the board
panel.
The executive relays of bottom setting I, II are switched on, if Т < UStI, Т < UStII and are
switched off, if Т> UstI + GSt, Т> UstII + GSt accordingly. The executive relays of top setting III,
IV are switched on, if Т> UStIII, Т> UStIV and are switched off, if Т < UStIII + GSt, Т < UStIV +
GSt accordingly. Here:
Т - current significance of measured quantity;
UstI, UstII, UStIII, UstIV – values of setting I, II, III, IV accordingly;
GSt - the value of hysteresis or a zone of return (is entered individually for each channel).
5.1.6. All executive relays are output by complete contact groups: general(common), normally
closed, normal opened contacts.
5.1.7. If during working RMT fails to measure significance of input quantity because of:
• input circuits breakage ;
• measured quantity exit out of range of measurements limits;
• ADC malfunctions,