Tactical EBMST, Инструкция по эксплуатации

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Tactical Controls Limited Multi-Stage Thermostat
Instruction Manual
The supply to the microprocessor is derived from the -52Vdc supply via a step-down switch
mode power supply. It is surge and transient protected.
The supply voltage is monitored for low supply voltage cutout. The 4 output stages are
switched off if the supply voltage is above -32Vdc and resumes when the supply voltage is
below -36Vdc.
Temperature measurement
The microcontroller works out the temperature by means of continuously measuring the
resistance across the NTC device and check it against a resistance/temperature look-up table.
°C Rt °C Rt
14 3707.9 21 2689.6
15 3536.8 22 2571.5
16 3378.3 23 2459.8
17 3225.9 24 2353.3
18 3081.3 25 2252
19 2939.5 26 2155.6
20 2813.6 27 2063.9
The signal from the NTC device is transient protected, amplified and filtered before it reaches
the microcontroller input.
Output switching
The output switching is derived from Ebac Ref. No. RCM-BAK-06-02 Issue D, 14/04/97.
THERMOSTAT CONTROL LOGIC
OUTPUT STAGE 1 STAGE 2 STAGE 3 STAGE 4
HIGH HEAT 0 1 1 0
LOW HEAT 0 1 0 0
LOW COOL 1 0 0 1
HIGH COOL 1 0 0 0
SETPOINT LOGIC 19°C
OUTPUT STAGE 1 STAGE 2 STAGE 3 STAGE 4
TEMP. rising falling rising falling rising falling rising falling
HIGH HEAT off off on on 16-off 15-on off off
LOW HEAT off off 17-off 16-on off off off off
LOW COOL 19-on 18-off off off off off 19-on 18-off
HIGH COOL on on off off off off 21-off 20-on
SETPOINT LOGIC 21°C
OUTPUT STAGE 1 STAGE 2 STAGE 3 STAGE 4
TEMP. rising falling rising falling rising falling rising falling
HIGH HEAT off off on on 18-off 17-on off off
LOW HEAT off off 19-off 18-on off off off off
LOW COOL 21-on 20-off off off off off 21-on 20-off
HIGH COOL on on off off off off 23-off 22-on
EBMST\IM Page 3 30 October1997
Issue 1.1