Tactical Controls Limited
Multi-Stage Thermostat
Instruction Manual
Technical Specification
Supply
Voltage
-32 to -63 Vdc; -52 Vdc nominal.
Ripple
Unaffected by 5 volt peak to peak.
Input protection
Reverse polarity protection. Surges and transients to BRB/RIA 12 and
RIA18 section 5, burst transient.
Current consumption
170mAdc maximum at -33Vdc (when 2 outputs are on)
70mAdc minimum at -33Vdc (when all outputs are off)
110mAdc maximum at -52Vdc (when 2 outputs are on)
45mAdc minimum at -52Vdc (when all outputs are off)
105mAdc maximum at -63Vdc (when 2 outputs are on)
40mAdc minimum at -63Vdc (when all outputs are off)
Low battery cut-out
All outputs off when supply voltage is above -32Vdc. Output resumes
when supply voltage is below -36Vdc.
Sensor
Temperature
One NTC sensor, 2-wire; resistance values between 14 to 27°C in
steps of 1°C are: 3707.9, 3536.8, 3378.3, 3225.9, 3081.3, 2939.5,
2813.6, 2689.6, 2571.5, 2459.8, 2353.3, 2252, 2155.6 and 2063.9
respectively. The sensor is not supplied.
Screened cable
Sensor cable wires must be screened and connected to system earth
Indicators
Supply
Green LED, illuminates when -52Vdc is connected to unit.
Stages 1 2 3 and 4
Four green Output LEDs, illuminates when output is energised.
Converter On
Green LED illuminates when Converter in ON.
Cooling System Alarm Three Amber LEDs to indicate Cooling System Alarm.
Compressor Trips
Two red LEDs to indicate High and Low Pressure Trip.
Setpoint input
Setpoint 19
Logic input; select 19°C when connected to -52Vdc.
Setpoint 21
Logic input; select 21°C when connected to -52Vdc.
Setpoint OFF
Logic input; select off when connected to -52Vdc.
Setpoint 23
Select 23°C when none of the setpoint input is connected to -52Vdc.
Relay output
Relays
The unit has four relay outputs, type: Schrack RP330024 with single
pole, normally open contacts. Common contacts of relays connected
to -52Vdc supply rail.
Contact rating
The relays are rated at 250Vac, 16A.
Mechanical life
Greater than 30 million operations.
Electrical life
Greater than 1 million operations at 52Vdc, 0.5Adc.
Stability
Maximum drift
Maximum of 0.3°C drift in switching temperature, over the
temperature range of 15 to 25°C and 1.5°C drift over -15 to 55°C.
EBMST\IM
Page 6
30 October1997
Issue 1.1
