Megmeet MTCW Thermostat Quick Start
Megmeet MTCW is a series of thermostats designed for industrial applications. These thermostats are suitable for a variety of environments, including those with high levels of vibration. The MTCW series supports multiple input and output signals, making them suitable for a variety of applications. The MTCW series can be controlled by BFM area or temperature control assistant. The products in the MTCW series feature RS485 communication, Ethernet communication, and supports Modbus protocol.
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MTCW series thermostat quick start 3. Installation 3.1 Environment temperature Thank you for using MTCW series thermostat of Megmeet . Before using the product, please carefully read this booklet so as to better understand it, fully use it, and ensure safety. This user manual is to offer you a quick guide to the design, installation, connection and maintenance of MTCW series thermostat, convenient for on-site reference. Briefly introduced in this booklet are the hardware specs, features, and usage of MTCW series thermostat, plus the optional parts and FAQ for your reference. For more information, see the MTCW series thermostat user manual. This manual is suitable for the following members of the MTCW series: MTCW-16-NN MTCW-12-NT MTCW-08-NT1 MTCW-08-NV MTCW-08-CT Vesion:1.2 Data:2017-10-26 BOM:R33010365 1. Appearance and part name Ambient temperature range: -5℃ ~ 55℃. When the ambient temperature exceeds 55℃ for a long time, it is best to choose a place with good ventilation. 3.2 Installation occasion ◆ No corrosion, flammable and explosive gas and liquid places. ◆ Secure vibration-free areas. ◆ This product is designed for installation of environmental II standard, pollution level 2 applications. 3.3 Installation method The product shall be installed horizontally on the back panel of the electric cabinet, and the distance between the product and the equipment or cabinet wall above and below shall be no less than 20cm. Installation in other directions is not conducive to the product itself heat, and the product under the heat must not have equipment. Install and fix with DIN slot DIN slot of 35mm width can be used for installation under low vibration environment. Open the DIN clasp at the bottom of the module and clip the bottom of the module on the DIN guide rail; The rotating module is close to the DIN guide rail and close the DIN clasp. Carefully check whether the DIN clasp on the module is tightly fixed with the DIN guide rail. Install and fix with screws In case of large vibration, screws must be used to fix the module. M3 can be used to fix the module on the back plate. The overall size and mounting hole size of this module are shown in the following. Figure. 2. Introduction 3.4 Cable connection and specification When wiring products, it is recommended to use multiple copper wires and prefabricate insulated terminals to ensure the quality of wiring. The recommended cross sectional area and type of wire are shown in the following table. Cable Input method: N:No current detection input C:Current detection input Output method: R:Relay output T:Transistor output V:Voltage output M:Mixed output N:No output Special function : Depending on the function, use 1, 2, 3...... To distinguish. Communication terminal(3PIN) Communication terminal(2PIN) Ethernet(RJ45) Position Allowed cable number Recommended stripping length Side 12~30AWG 6.5mm Side 12~30AWG 6.5mm Top Ethernet cable / 16~26AWG 10~15mm 16~26AWG 10~15mm User input Top terminal(12PIN) Communication Top terminal(6PIN) installation Screw mounting Screw mounting In-line installation In-line installation In-line installation For security (to prevent electric shock and fire accident), and reduce the noise, the module of grounding terminal shall be in strict accordance with the national electrical code requirements, grounding resistance should be less than 100 Ω. When more than one module is grounded, single point grounding should be adopted. The ground 1 wire cannot form a circuit. As shown in the following figure Error 4.2 User connection mode Correct 4. Terminal Introduction 4.1 User terminal MTCW-12-NT terminal silk screen 5 things to pay attention to when wiring: User terminal definition table Remark 24V+,24V- Description Input power DC 24V Ground A0,B0 The first channel of RS485(COM0) A1,B1 The second channel of RS485(COM1) GND The second channel of signal ground WAN Ethernet communication port Channels 1 to 16 are positive for thermocouple L1+~L16+ (thermal resistance) signal input Channels 1 to 16 are negative for thermocouple L1-~L16(thermal resistance) signal input Channels 1 to 16 are negative for thermal LR1-~LR16resistance signal input Y01~Y04,COM0 Switch output port channel 1~4 Y05~Y08,COM1 Switch output port channel 5~8 ①The thermocouple (thermal resistance) signal is recommended to be accessed through the shielded cable (connection cable). Cables should be kept away from power lines or other wires that may cause electromagnetic interference. Using long cables (connecting cables) is susceptible to noise interference. It is recommended to use cables less than 100 meters in length (connecting cables). The cable (connecting cable) has impedance, which will introduce measurement error. The characteristic adjustment can solve this problem. ②The thermal resistance must be connected by a three-wire system. ③It is recommended that the positive and negative terminals of the channel will not be used L+, L- short connection, in order to prevent the channel will detect the wrong data. ④If there is too much electrical interference, please connect the shielding line (the compensation cable shielding end of thermocouple, the cable shielding end of the thermal resistance connection, the shielding end of the 485 communication line) with the thermostat grounding end PG. ⑤The thermostat grounding PGND should be good grounding. 5. Electrical indicator 5.1 Power indicator Y09~Y12,COM2 Switch output port channel 9~12 Item Y13~Y16,COM3 Switch output port channel 13~16 Input voltage range Input current The positive pole of the voltage output channel VO1+~VO12+ 1~12 The negative pole of the voltage output channel VO1-~VO12- CT1~CT8 Min value Typical value Max value Remark Vdc 20 24 30 Normal start-up and working range A / 0.08 / Normal temperature rated full load 1~12 5.2 Performance indicators The positive of current input signal channel 1~ Item Number of input channels Measuring current range CT input Allowable max current Display precision Display resolution 8 The negative of current input signal channel 1~ CT- Unit 8 Note:The output only one common terminal COM of MTCW-12-NT and MTCW-08-TT. Indicator 8 AC0.4~50.0A(rms)(Peak current<71A, number of turns :800, number of current through :1) AC60A(rms) (Peak current<85A,number of turns:800, number of current through:1) Full scale ±5% 0.1A Note:The measurable current range is related to the number of turns of the ct and the number of times the current passes through the CT. 2 Input signal Item Thermocouple type Thermal resistance type Note: MTCW series thermostat support MTC series thermostat BFM area. Indicator K、J、E、N、T、R、S、B Function Pt100、Cu100、JPt100、Cu50、Ni120 Power supply voltage circuit: 5V ~ 24V; Transistor The maximum circuit power supply voltage Input output with circuit: 30V; Loop current: 0.3A /24Vdc; method open gate Leakage current when open:<0.1mA/30Vdc; Minimum load:5mA(5Vdc~24Vdc) The sampling period About 100 ms 1~100,the unit is 0.1s.The specific value is determined by the Fast characteristics of the temperature Control controlled object cycle 1~100,the unit is 1s.The specific value Slow is determined by the characteristics of the temperature controlled object Control method ON/OFF,hand,single PID control Type K -100℃~1200℃(-148℉~2192℉) Type J -100℃~1200℃(-148℉~1112℉) Type E -100℃~850℃(-148℉~1562℉) Type N -100℃~1200℃(-148℉~2192℉) Type T -200℃~300℃(-328℉~572℉) Type R 0℃~1600℃(32℉~2912℉) Rated temperature Type S 0℃~1600℃(32℉~2912℉) range Type B 400℃~1800℃(752℉~3272℉) Pt100 -150℃~600℃(-238℉~1112℉) JPt100 -150℃~500℃(-238℉~932℉) Cu100 -30℃~120℃(-22℉~248℉) Cu50 -30℃~120℃(-22℉~248℉) Ni120 -80.0℃~280.0℃(-112.0℉~536.0℉) Input range ± 0.3%, ambient temperature Thermocouple compensation error <=2℃ Accuracy Thermal Input range ±0.5% resistance The sampling channel is isolated from the power supply, the sampling channel is Isolation isolated from the output, and the channels are not isolated from each other COM0 COM1 WAN Communication protocol Modbus Modbus Modbus and Modbus TCP Heating side control output(MV) Multi-step control of current execution step Working status word Digital filter set of one step D0 D1 A0 A1 Input type Set value(SV) Proportional cycle time Heat side proportional band Heat side integral time Heat side derivative time Control action Heat/cool action Hand output value Adjust sensitivity 5.3 Communication specification Name Measured value(PV) Port remark Communication method A0,B0 RS485 A1,B1 RS485 ETHERNET WAN Auto-tuning deviation Step 1 temperature Step 2 1temperature Step 3 temperature 5.4 Indicator description Name Status Indicator PWR ON 24V power turn on Normal Step 5 temperature RUN Flashes quickly (10Hz~15Hz) Flashes slowly (0.5Hz~1Hz) There is an error. See #3612 and #3613 for the error status Step 6 temperature COMM or COMM0 Flashes COM0 is communicating COMM1 Flashes Y01~Y16 ON COM1 is communicating The corresponding channel output is ON 6. BFM The module USES Modbus to exchange temperature data and other information with the main module through BFM. A cache of read and write attributes can be read and written using the MODBUS directive. MODBUS supports 01, 03, 05, 06 and 16 functions. 01, 05 function code to the bit register operation, 03, 06, 16 function code to the integer register operation, if read reserved unit, will get 0 value. With MODBUS protocol, up to 100 BFM units can be read and written at one time. Step4 temperature Step 7 temperature Step 8 temperature Step 1 time Step 2 time Step 3 time Step 4 time Step 5 time Step 6 time CH1 CH9 1500 1508 1532 1540 1564 1572 1596 1604 1628 1636 1788 1796 1820 1828 1724 1732 1756 1764 1660 1668 1692 1700 1852 1860 1884 1892 1916 1924 1948 1956 1980 1988 2012 2020 2044 2052 2076 2084 2108 2116 2140 CH2 CH10 1501 1509 1533 1541 1565 1573 1597 1605 1629 1637 1789 1797 1821 1829 1725 1733 1757 1765 1661 1669 1693 1701 1853 1861 1885 1893 1917 1925 1949 1957 1981 1989 2013 2021 2045 2053 2077 2085 2109 2117 2141 CH7 CH15 1506 1514 1538 1546 1570 1578 1602 1610 1634 1642 1794 1802 1826 1834 1730 1738 1762 1770 1666 1674 1698 1706 1858 1866 1890 1898 1922 1930 1954 1962 1986 1994 2018 2026 2050 2058 2082 2090 2114 2122 2146 CH8 CH16 1507 1515 1539 1547 1571 1579 1603 1611 1635 1643 1795 1803 1827 1835 1731 1739 1763 1771 1667 1675 1699 1707 1859 1867 1891 1899 1923 1931 1955 1963 1987 1995 2019 2027 2051 2059 2083 2091 2115 2123 2147 2148 2149 2150 2151 2152 2153 2154 2155 2172 2180 2204 2212 2236 2244 2268 2276 2300 2308 2332 2340 2364 2372 2396 2404 2428 2436 2460 2468 2492 2500 2524 2532 2556 2179 2187 2211 2219 2243 2251 2275 2283 2307 2315 2339 2347 2371 2379 2403 2411 2435 2443 2467 2475 2499 2507 2531 2539 2563 2173 2181 2205 2213 2237 2245 2269 2277 2301 2309 2333 2341 2365 2373 2397 2405 2429 2437 2461 2469 2493 2501 2525 2533 2557 CH3 CH11 1502 1510 1534 1542 1566 1574 1598 1606 1630 1638 1790 1798 1822 1830 1726 1734 1758 1766 1662 1670 1694 1702 1854 1862 1886 1894 1918 1926 1950 1958 1982 1990 2014 2022 2046 2054 2078 2086 2110 2118 2142 2174 2182 2206 2214 2238 2246 2270 2278 2302 2310 2334 2342 2366 2374 2398 2406 2430 2438 2462 2470 2494 2502 2526 2534 2558 CH4 CH12 1503 1511 1535 1543 1567 1575 1599 1607 1631 1639 1791 1799 1823 1831 1727 1735 1759 1767 1663 1671 1695 1703 1855 1863 1887 1895 1919 1927 1951 1959 1983 1991 2015 2023 2047 2055 2079 2087 2111 2119 2143 2175 2183 2207 2215 2239 2247 2271 2279 2303 2311 2335 2343 2367 2375 2399 2407 2431 2439 2463 2471 2495 2503 2527 2535 2559 CH5 CH13 1504 1512 1536 1544 1568 1576 1600 1608 1632 1640 1792 1800 1824 1832 1728 1736 1760 1768 1664 1672 1696 1704 1856 1864 1888 1896 1920 1928 1952 1960 1984 1992 2016 2024 2048 2056 2080 2088 2112 2120 2144 2176 2184 2208 2216 2240 2248 2272 2280 2304 2312 2336 2344 2368 2376 2400 2408 2432 2440 2464 2472 2496 2504 2528 2536 2560 CH6 CH14 1505 1513 1537 1545 1569 1577 1601 1609 1633 1641 1793 1801 1825 1833 1729 1737 1761 1769 1665 1673 1697 1705 1857 1865 1889 1897 1921 1929 1953 1961 1985 1993 2017 2025 2049 2057 2081 2089 2113 2121 2145 2177 2185 2209 2217 2241 2249 2273 2281 2305 2313 2337 2345 2369 2377 2401 2409 2433 2441 2465 2473 2497 2505 2529 2537 2561 2178 2186 2210 2218 2242 2250 2274 2282 2306 2314 2338 2346 2370 2378 2402 2410 2434 2442 2466 2474 2498 2506 2530 2538 2562 3 Step 7 time Step 8 time Repeat start step Repeat end step Repeat count The value alarm 1 The value alarm 2 The value alarm 3 The value alarm 4 Overlap/Deadband Undershoot suppresion factor Heat side proportional band adjusting factor Heat side integral band adjusting factor Heat side derivative band adjusting factor Analog output Heating side control output (MV) Temperature rise speed Temperature drop speed Control object character PID arithmetic PID output upper limit PID output lower limit PID output dead band Hand/ automatic smooth transfer Error status word (system error) Error status word (broken even error) Set value range error address Channel characteristics confirmation command Control start / stop settings 2564 2588 2596 2620 2628 2652 2660 2684 2692 2716 2724 2748 2756 2780 2788 2812 2820 2844 2852 3036 3044 3068 3076 3164 3172 3196 3204 3228 3236 4262 4270 1532 1540 3356 3364 3388 3396 3420 3428 3452 3460 3484 3492 3516 3524 3548 3556 3580 3588 2565 2589 2597 2621 2629 2653 2661 2685 2693 2717 2725 2749 2757 2781 2789 2813 2821 2845 2853 3037 3045 3069 3077 3165 3173 3197 3205 3229 3237 4263 4271 1533 1541 3357 3365 3389 3397 3421 3429 3453 3461 3485 3493 3517 3525 3549 3557 3581 3589 2566 2590 2598 2622 2630 2654 2662 2686 2694 2718 2726 2750 2758 2782 2790 2814 2822 2846 2854 3038 3046 3070 3078 3166 3174 3198 3206 3230 3238 4264 4272 1534 1542 3358 3366 3390 3398 3422 3430 3454 3462 3486 3494 3518 3526 3550 3558 3582 3590 2567 2591 2599 2623 2631 2655 2663 2687 2695 2719 2727 2751 2759 2783 2791 2815 2823 2847 2855 3039 3047 3071 3079 3167 3175 3199 3207 3231 3239 4265 4273 1535 1543 3359 3367 3391 3399 3423 3431 3455 3463 3487 3495 3519 3527 3551 3559 3583 3591 2568 2592 2600 2624 2632 2656 2664 2688 2696 2720 2728 2752 2760 2784 2792 2816 2824 2848 2856 3040 3048 3072 3080 3168 3176 3200 3208 3232 3240 4266 4274 1536 1544 3360 3368 3392 3400 3424 3432 3456 3464 3488 3496 3520 3528 3552 3560 3584 3592 2569 2593 2601 2625 2633 2657 2665 2689 2697 2721 2729 2753 2761 2785 2793 2817 2825 2849 2857 3041 3049 3073 3081 3169 3177 3201 3209 3233 3241 4267 4275 1537 1545 3361 3369 3393 3401 3425 3433 3457 3465 3489 3497 3521 3529 3553 3561 3585 3593 2570 2594 2602 2626 2634 2658 2666 2690 2698 2722 2730 2754 2762 2786 2794 2818 2826 2850 2858 3042 3050 3074 3082 3170 3178 3202 3210 3234 3242 4268 4276 1538 1546 3362 3370 3394 3402 3426 3434 3458 3466 3490 3498 3522 3530 3554 3562 3586 3594 3612 3613 3616 3617 3624 3625 3628 3630 3629 3631 Self-tuning setting value reset Change settings allowed CH1-CH16 multi-stage control execution flag Alarm 1 mode setting 3636 3637 3640 Alarm 2 mode setting 3656 Alarm 3 mode setting Alarm 4 mode setting 3660 3664 3644 3648 3649 3652 2571 2595 2603 2627 2635 2659 2667 2691 2699 2723 2731 2755 2763 2787 2795 2819 2827 2851 2859 3043 3051 3075 3083 3171 3179 3203 3211 3235 3243 4269 4277 1539 1547 3363 3371 3395 3403 3427 3435 3459 3467 3491 3499 3523 3531 3555 3563 3587 3595 Alarm dead zone setting Alarm delay times 3668 3672 3680 3681 External input status Cold junction temperature Module parameter saving Module software version information Thermostat identification code PID parameter hidden switch 3620 3684 3688 3692 4582 System error status word(3612) Bit status ON(1) OFF(0) When any error of b1 ~ b7 occurs, this flag bit is 1 (any one of b1 ~ No error b2 is 1, all channels AD conversion stops) - - Bit0:Error Bit1:Remain Bit2:Hardware malfunction AD converter or other hardware failure When there is an error due to interference and MTCW internal, the flag bit changes to 1. Please contact the sales agent or our company if the error cannot be cleared after the power is cut off and reconnected - This flag bit is 1 if there is an error reading the backup data due to interference and internal errors in MTCW - Bit3:Setting value backup error Bit4:Cold junction temperature compensation error Bit5:Remain Bit6:Set value recovery is error Bit7~Bit15:Remain Normal Data backup is normal - - - Broken even error status word(3613) Bit status ON(1) OFF(0) This flag is 1 Bit0 ~ Bit15 broken channel couple detection When thermocouples of channels 1 to without (only supports 16 are broken broken thermocouple) even error Ethernet function: Address 2 Address 3 Address 4 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4195 4196 4197 Name Protocol selection Native gateway Native mask Address 1 Native IP Local port 4193 Remote IP Remote port 4194 4198 4180 Protocol selection(4180) Function TCP server TCP client UDP MODBUS 16#0001 16#0002 16#0003 MODBUS_TCP 16#0101 16#0102 16#0103 7. CT input 7.1 Functional specifications 1.There are two kinds of measured currents, which are set according to "CT action". ①general current measurement (clamp table mode) occasions. 4 Detect current value: update the current when output. ON;Update time: set the "detection current cycle". ②heater broken line detection occasions. Detect current value: "current when output is ON" . update current when output is ON. "Output current when OFF" updates the current when output is OFF. Update time: fixed at 100ms. 2.The measured current range can be changed according to "CT turn" and "CT wire crossing times". 3.Alarm can be set by "broken wire detection", "over current detection" and "short circuit detection". 7.2 CT buffer(BFM) Function CH1 CT action 5351 5352 5353 5354 5355 5356 5357 5358 CT measurement waiting time CT turn CT wire crossing times Heater disconnection detection current value Overcurrent detection current value Short circuit detection current value Backlash Delay time Recovery condition not detected Always detect current measurement cycle Current at output ON Current at output OFF CT alarm detection Alarm output forced enable Item CT action CT measurement waiting time CT turn CT wire crossing times Heater disconnection detection current value Overcurrent detection current value Short circuit detection current value Backlash Detection current cycle CH2 CH3 CH4 CH5 CH6 CH7 CH8 5383 5384 5385 5386 5387 5388 5389 5390 5415 5416 5417 5418 5419 5420 5421 5422 5447 5448 5449 5450 5451 5452 5453 5454 5479 5480 5481 5482 5483 5484 5485 5486 5511 5512 5513 5514 5515 5516 5517 5518 5575 5576 5577 5578 5579 5580 5581 5582 5607 5608 5609 5610 5611 5612 5613 5614 3.Because the default communication parameters are the same, so the connection can automatically communicate. 4.MTCW-16NN can be controlled by BFM area or temperature control assistant. 9. Common problems and solutions When the module does not work properly, please check in turn: (1) the connection of the power line and the condition of the relevant switches and protection appliances, so as to ensure the reliable power supply of the module. (2) whether the wiring of user terminals is firm. (3) check whether the 24Vdc power supply is overloaded. (4) check the application program to ensure that the correct operation method and parameter range are selected in the application. Special attention should be paid to the BFM area with special operation timing. If you still cannot work after the above check, please refer to the following table. Phenomenon Possible Causes Countermeasures POWER and other LEDs are OFF Loss of power supply or low voltage Power switch off or fuse blown Abnormal power wiring Check the power condition and exclude it Check the condition of switches, wires or fuses for elimination 5639 5640 5641 5642 5643 5644 5645 5646 5671 5672 5673 5674 5675 5676 5677 5678 7015 7016 7017 7018 7019 7020 7021 7022 7047 7048 7049 7050 7051 7052 7053 7054 5703,5704 5705 Setting value 0:Always measure current 1:Heater disconnection detection 30~300ms 100~4000 turns 1~6 time 0~350A 0~350A 0~350A Power supply is damaged POWER LED flashes intermittently POWER LED flashes intermittently ON(1) OFF(0) This bit is 1 when a wire break alarm No error occurs on channels 1 to 8. This bit is 1 when an overcurrent No error alarm occurs on channels 1 to 8. ON(1) OFF(0) This bit is 1 when a wire break alarm No error occurs on channels 1 to 8. Unstable power supply Module damaged RUN LED Remotely shut down by the host computer equipment Is OFF System error shutdown RUN LED flashes slowly Input status indicator is inconsistent with input terminal status The output cannot be turned off (OFF) The status indication is inconsistent with the status of the output terminal 0~350A 0.1~3200s CT alarm detection status word(5704) Bit status Bit0~7 wire break alarm 1.MTCW-16-NN has no output control. If temperature control is needed, it is necessary to cooperate with magmet's remote IO (remote IO model: MEVW-1616T). 2.Connect A1 and B1 of MTCW-16-NN with A0 and B0 of mevw-1616t through cables respectively.Communication mode: RS485, communication protocol: MODBUS 5543 5544 5545 5546 5547 5548 5549 5550 CT alarm detection status word(5703) Bit status Bit0~7 wire break alarm Bit8~15 overcurrent alarm 8. Instructions for use of MTCW-16-NN The serial port cannot communicate normally Check and confirm whether the voltage between 24V+ and 24V- terminals is in normal range; Make the upper computer boot by remote control Check with the thermostat assistant Possible system error Please check the 3612、3613 The on-resistance of the subscriber line is too large Shorten the length of wire, do not use too thin wire Poor signal circuit contact Check connections and troubleshoot Poor external connection Damaged relay contact The relay is aging or damaged, or the indicator is damaged Poor cable connection, or wrong signal properties of the connected lines, such as TXD and RXD are confused Inconsistent setting of communication master-slave characteristics, such as baud rate, parity, data bits, address Serial port cannot control other devices Frequently operated relay ports can be replaced with idle ports Connect the signal line correctly Set the communication parameters to be consistent Communication master and slave use protocol inconsistency set the communication protocol to be consistent 1.Warranty scope refers to the programmable controller body. 5 2.The warranty period is 18 months, during the warranty period of normal use, the product failure or damage, our company free maintenance. 3.The warranty period starts from the date of production. The machine code is the only basis to judge the warranty period. The equipment without machine code shall be treated as overinsured. 4. Even within the warranty period, a certain maintenance fee will be charged if: (1)Failure to operate according to the user's manual; (2)Machine damage caused by fire, flood, abnormal voltage, etc. (3)Damage caused when a programmable controller is used for unusual functions. (4)Self-disassembly programmable controller 5. The service fee shall be calculated according to the actual cost. If there is another contract, the contract shall take precedence. 6.If you have any problem, you can contact the agent or contact us directly. SHENZHEN MEGMEET CONTROL TECHNOLOGY CO., LTD Add:5th Floor, Block B Unisplendour Information Harbor, Langshan Road, Shenzhen Tel:400-666-2-163 fax:(+86)0755-86600999 Postcode:518057 Web:www.megmeet-ia.com 6 ">

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Key features
- RS485 and Ethernet communication
- Modbus protocol support
- Multiple input and output channels
- Industrial design for vibration resistance
- BFM area control
Frequently asked questions
The MTCW series thermostats support RS485 and Ethernet communication, with Modbus protocol.
The typical voltage range for the MTCW series power input is 24V DC.
It's recommended to use cables less than 100 meters in length. Longer cables might be susceptible to noise interference and introduce measurement errors.
The CT input allows for current measurement and detection of various conditions, including heater disconnection, overcurrent, and short circuit.
The MTCW series thermostats can communicate with up to 100 BFM units.