2
NT579-NT579 RS485
TECSYSTEM SHANGHAI
1) NT579 TECHNICAL
INTRODUCTION
NT579 is a microprocessor electronic device designed to integrate the ther-
mal control of resin-cast transformers .
The monitoring unit has separated and independent inputs and outputs:
3 3-wire Pt100 inputs for each winding (total 3 inputs)
2 relays for Alarm - Trip signalling
1 FAULT common relay (sensor fault, monitoring unit working anomaly)
SUPPLY
·
Rated values: 18~36 Vdc
COMMUNICATION ON DIGITAL OR
AD VERSION
·
RS485 MODBUS RTU
INPUTS (Figure 2 Page 11)
3 3-wire PT100 sensor inputs.
·
Removable rear terminals
Input channels protected against
electromagnetic noises
OUTPUTS (Figure 2 Page 11)
2 relays ALARM-TRIP with 6A-250Vac
resistive contacts (cosΦ=1)
·
1 FAN output at 250Vac Max, 50/60
Hz (max current 12A with cosΦ=1)
·
1 alarm relay for sensor fault or
working anomaly (FAULT)
with 6A
-
250Vac
resistive contacts
(cosΦ=1)
