Thermal control of transformers, motors
and electric generators
Microprocessor device for thermal control of transformers, motors and
electric generators. With a LCD 16x2 display to simultaneously show all
the measured temperatures. Easy and practical user's data programming.
Equipped with four input channels, one of which deactivable by programming,
for three wires Pt100 (RTD) probes. Relay outputs for: fan activation,
alarm, unhook, probe's damage or out of control signal.
Technical specifications
Power supply
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nominal line voltage and frequency: 24 ÷ 250 Vcc and Vac at 40 ÷
60 Hz
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Maximum line voltage from 20 to 260 Vcc and Vac
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Vcc with reversible polarity
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Maximum power absorption 7 VA
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Protection against electrical and magnetic noises
Inputs
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4 analog input channels for three wires Pt100 probes compliance with requirement
DIN 43760. The operator can de-activate the 4th channel from programming
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connection with removable terminals for wires of 1,5 mm2 section
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cables length compensation up to 500 m (1 mm2 section)
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detection for broken or not connected probes
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input channels protected against electromagnetic noises and spikes
Outputs
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4 output relays with contacts capacity of 5A with 250Vac
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one relay for the 1st setpoint level (for fan control)
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one ralay for the 2nd setpoint level (pre-alarm)
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one relay for the 3rd setpoint level (unhook of the electrical unit)
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one relay for probe fault or working anomaly signaling (general alarm)
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output connection with removable terminals for wire of 1,5 mm2 section
and capacity of 8A/250 Vac
Device dimensions
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frontal dimension 96 mm x 96 mm compliance with DIN 43700 requirements.
Device length of 105 mm with rear terminals
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assembling on the front of the electric panel
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panel cut-out 92 mm x 92 mm
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ABS self-extinguishing container
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Frontal panel in anti-scratch polyestere with keyboard and signal leds
Performances
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Temperature monitoring from 20°C to 200°C
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Temperature measurements accuracy ±0,5% full scale, ±1 digit
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Digital linearity of probe signal compliance with DIN 43760 requirements
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Self-diagnostics
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Operating temperature range from 5°C to 50°C
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Humidity lower then 95% no-condensing
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Compliance with CE requirement
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User data storage for 10 years without power supply
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Device functionality self-diagnostic
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Alarm signal for working anomalies or wrong user data definition
Displaying and data management
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backlighted LCD display 16 characters x 2 lines, for the visualization
of all the 4 measured temperatures
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3 leds indicating alarm levels
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1 led indicating working anomalies or probe fault
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user data programming by membrane keypad
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automatic exit from programming procedure after 30 seconds of no operation
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3 temperature levels programming for 3 input channels
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3 temperature levels programming for the 4th input channel
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hysteresis, alarm memory, delay and impulse data programming
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notification for wrong user data statements
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stated data recall and visualization by the membrane keypad
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maximum measured temperature storage for each input channel
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memory alarm reset by membrane keypad
All these data are in the technical brochure brochureNEXe.pdf.