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TECSYSTEM SHANGHAI INSTRUCTION MANUAL NT579 STANDARD & DIGITAL (24 Vdc) TECSYSTEM SHANGHAI 3rd Floor, Block No.5, For- ward High-tech Industrial Park, No.33, Fuhua Road, Jiading District SHANGHAI - CHINA http://www.tecsystem.asia R.1.4 2015/08/10 NT579-NT579 RS485...
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TECSYSTEM SHANGHAI 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)
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13.2Hz Acceleration ± 0.7G from 13.2Hz to 100Hz. (*) Seismic test according to IEEE 344-1.987 *Cross reference T154 for construc- tive analogy. DIMENSIONS 162 x 82 mm depth 130 mm (terminal boxes included) Panel cut-out 152x76 mm NT579-NT579 RS485...
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Firmly tighten the device with the enclosed fixing kit. 3) SUPPLY OF NT579 CONTROL DEVICE NT579 has a power supply of 18~36Vdc 50-60 Hz When the monitoring device is directly fed from secondary winding of the transformer to be protected, it can be damaged by high-intensity overvolt- ages.
Figure 2 Page 11 shows the position inside the terminal box of the connection ca- TECSYSTEM has designed an own special cable to transfer the measuring signals, according to CEI standards, with all the protection requirements pro- vided for : model CT-ES bles to the monitoring device.
ALARM and TRIP relay switching, they de-energise with consequent turning off of the relevant LED’s. 11) COOLING FAN CONTROL NT579 monitoring unit, if opportunely programmed, can control ON-OFF of fans accompanying the transformer, according to set temperatures. 12) FAN TEST It is possible, through programming (HFn), impose that fans are activated for 5 minutes each “xxx”...
Alarm 90 ° C, 119 ° C Trip, yes Fan, Fan on 70 ° C, 60 ° c Fan off, Fcd no, no HFN, Adr 1, Par eve , Bdr 19.2, 4.20 Out scan. Reprogram the desired values and ensure that these are stored. In case of error Ech permanent return the equipment to Tecsystem SH for repair.. CAL ERROR.
Fan-on thresholds must be higher than the Fan-off thresholds. In case you try to load these thresholds in a wrong way, NT579 monitoring unit won’t proceed with the programming and data storage; therefore in the coming readings you will read the data relevant to the previous pro- gramming's.
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Channel logs can be read with code 3 from number 1 to number 18 WORKING NOTES The modbus inside option allow to connect NT579 monitorning unit with a RS485 network With MODBUS RTU protocol in order to read the data shown in the table at pag.
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Fan cyclic test for 5 min- 12 PRG/SET display shows HFN utes each “n” hours Load desired number of hours no= disabled function Fault for temperature 14 PRG/SET FCD threshold appears fast increase (° C/sec) NT579-NT579 RS485...
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8. The serial communication of the temperature control monitoring unit is ac- tive just when NT579 is in temperature control working mode in one of the intended modes (Scan, Auto, Man and T.Max). When other functions such as programming, programming display and re- lay test are activated, the ModBus communication is temporarily deacti- vated.
TECSYSTEM SHANGHAI DATA TRANSMISSION ON MODBUS NETWORK The MODBUS INSIDE option allows to connect NT579 monitoring unit with a RS485 network with Modbus RTU protocol in order to read and write the data shown in the table MODBUS MAPPING at pag.13. The unit is always in slave mode.
ERROR CODES (exception code) In case of wrong request ModBus will answer with modified codes and codified errors according to the following points: - Non-supported function code - Wrong data address - Wrong data (for instance length) -illegal data(for value) NT579-NT579 RS485...
, Starting address HI, Starting address LO, Num- (10) ber of Point HI, Number of Point LO, Byte count, Data HI, Data LO……., Crc LO, Crc HI. The alarm thresholds (registers 3-4-5-6) are written only for channel L1 NT579-NT579 RS485...
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2’compl. Ch L1 tem- 2’compl. from 1° perature sign to 220 Fan off set point 2’compl. from – 2’compl. Ch L2 tem- 20° to sign perature 2’compl. 2’compl. Ch L2 from 1° sign Maximum to 220 temperature NT579-NT579 RS485...
2’compl. Ch L3 tem- perature 2’compl. sign from 1° to 220 alarm set point 2’compl. Ch L3 tem- perature from 1° to 220 2’compl. sign trip set point 2’compl. Ch L3 temperature from 1° to 2’compl. sign Fan on set point NT579-NT579 RS485...
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See CHn story note channel L2 Ch L2 story Alarm history See CHn story note channel L3 Ch L3 story Alarm history setting fan test 0=No test cycle (hours) 1~200h detector tem- 0=No FCD perature incre- ment fast 1~30° /sec NT579-NT579 RS485...
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Not used TRIP ALARM Not used CH L1-L2-L3 STORY CH A-b-c STORY BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Not used TRIP ALARM Not used Not used Not used NT579-NT579 RS485...
A strong disturbance damaged the stored dataplease refer paragraph 8. When turning on, “ECH” indication ap- If this problem should persist, please pears contact TECSYSTEM SH Technical De- partment. Wrong sensor connections. Terminal box connected inside out. All the Pt100 sensor are in FCC.
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When a channel is in Fault condition for FCD, relevant Alarm and trip signalling are inhibited in order to just report the anomaly for too fast increase of the temperature. Press Reset to cancel the FCD signalling of all the channels and restore the fault relay. NT579-NT579 RS485...
RELAYS CONNECTION RELAYS NOTE: when the unit is powered the fault relay 54-55 opens and it closes again in case of fault condition or no power. Relay fan contact ON/OFF 50 51 52 53 54 55 56 57 TRIP ALARM FAULT POWER SUPPLY 18~36 Vdc BE CAREFUL TO CONNECT THE POWER SUPPLY WITH THE RIGHT POLARITY RS485 DIGITAL OUTPUT REAR PANEL NT579-NT579 RS485...
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The Product purchased is covered by manufacturer's warranty or the seller's terms and conditions set forth in the "General Conditions of Sale Tecsystem SHANGHAI", available at www.tecsystem.asia and / or purchase agreement. The warranty is considered valid only when the product will be damaged by causes attributable to TECSYSTEM SHANGHAI, such as manufacturing or components defects.
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8) if NOT j=8 then go to 5 9) i+1->i 10) if NOT i=N then go to 3 11) A->in CRC (result is in the order L,H) 编码 ( ) 请求: 从属地址、16(10)编码、HI启动地址、LO启动地址、HI点数、LO 点数、字节计数、HI数据、LO数据……., Crc LO和Crc HI。 应答: 从属地址、16(10)编码、HI启动地址、LO启动地址、HI点数和LO, Crc LO和Crc HI点数。 报警门槛值(寄存器3-4-5-6)仅仅被写入通道1,并自动复制到第2和第3 NT579-NT579 RS485 智能温控器...
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Fan off set point 2’compl. Ch L2 from –20° 2’compl. sign temperature to 230 2’compl. Ch L2 from 1° to 2’compl. sign Maximum temperature 2’compl. Ch L2 from 1° to 2’compl. sign temperature alarm set point NT579-NT579 RS485 智能温控器...
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2’compl. sign from 1° to 220 alarm set point 2’compl. Ch L3 temperature 2’compl. sign from 1° to 220 trip set point 2’compl. Ch L3 temperature 2’compl. sign from 1° to 220 Fan on set point NT579-NT579 RS485 智能温控器...
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L2 Ch L2 story Alarm history See CHn story note channel L3 Ch L3 story Alarm history setting fan test 0=No test cycle (hours) 1÷ 200h detector tem- 0=No FCD perature incre- ment fast 1÷ 30° /sec NT579-NT579 RS485 智能温控器...
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BIT 0 Not used TRIP ALARM Not used CH L1-L2-L3 STORY BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Not used TRIP ALARM Not used Not used Not used NT579-NT579 RS485 智能温控器...
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