Technische Alternative ESR21-D User Manual (English)

Questions and Answers:

D
David LongAug 9, 2025
Why is my Technische Alternative Control Unit displaying incorrect temperatures?
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  John KellerAug 9, 2025
  If your Technische Alternative Control Unit shows values like -999 (sensor short-circuit) or 999 (interruption), it doesn't automatically indicate a hardware issue. Ensure the correct sensor types (KTY or PT1000) are selected in the menu under SENSOR, as the default setting is PT (1000). To check the sensor, replace the potentially faulty sensor with a known working one on the terminal strip to verify the display.
T
Tammy KingAug 18, 2025
What to do if my Technische Alternative ESR21-D system is not in operation?
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  Hannah BrowningAug 18, 2025
  If your Technische Alternative Control Unit isn't working despite having power, check the 3.15A quick-blowing fuse that protects the control system and the output. Replace the fuse if necessary.
D
Dustin CookAug 29, 2025
How to troubleshoot a malfunctioning Technische Alternative Control Unit with realistic temperature values?
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  Jennifer JonesAug 29, 2025
  If your Technische Alternative Control Unit is malfunctioning but displaying plausible temperatures, consider these checks: * Verify the program number. * Examine the switch-on and switch-off thresholds and the set differential temperatures to see if they've been reached. * Check if settings in the submenus have been altered. * Test the output in manual mode to ensure it can be switched on and off. If it responds correctly during an endurance run, the unit is likely in order. * Confirm that all sensors are connected to the correct terminals. You can test a sensor by heating it with a lighter and observing the display.

Technische Alternative ESR21-D Specifications

General

Power Supply	24 V AC/DC
Input Voltage	24 V AC/DC
Temperature Range	-10°C to +50°C
Operating temperature	-10°C to +50°C
Number of analog inputs	4
Number of relays	4
Communication Interface	CAN
Display	LCD
Humidity	non-condensing
Number of digital inputs	8
Analog input range	0-10 V, 0-20 mA
Certification	CE
Storage temperature	-20°C to +70°C