30+ Years of Precision Instruments
Product Introduction: Used together with external SCRs, the ZK□-1 SCR voltage regulator can continuously phase-shift regulate the heating voltage on single-phase loads, and the ZK□-3 SCR voltage regulator can continuously phase-shift regulate the heating voltage on three-phase loads. Since the actual voltage on the load can be introduced into the regulator as deep voltage negative feedback, there is a good proportional relationship between the input current and the output voltage, with good suppression of grid voltage fluctuations. When used together with secondary instruments such as XMT-7911, XMT-191 and XT-7912 with 0-10mA or 4-20mA outputs, high-precision automatic temperature control of single-phase or three-phase resistance furnaces can be achieved.
Phase-shift triggering changes the heating power by continuously changing the RMS value of each power waveform on the load. The advantage is that after the system stabilizes, the voltage on the load is low, significantly extending the service life of the heater, with no sudden or flickering interference to the grid; ordinary moving-coil meters can be used to indicate load voltage and load current.
Features: 1. The regulator uses a built-in large panel meter as the output indicator, easy to read and mechanically zero. The installation depth is half that of the old product, the weight is reduced threefold, with good vibration resistance and strong anti-interference ability. 2. If required, the fast SCR overcurrent protection function can be enabled; in the event of load short circuit or overcurrent, the regulator can automatically switch off the SCR trigger signal within 0.1 second, causing the SCR to cut off and avoid damage, while also providing load short circuit indication; the short circuit protection value is determined by the user's external current transformer (optional). 3. The zero-cross signal is taken directly from the grid, suitable for "delta", "Y" and other load connection methods, with low grid frequency requirements and stable, reliable control. 4. For loads with low cold-state resistance, manual soft start can be used. 5. The "feedback" adjustment potentiometer is arranged on the panel; professionals can use it as "output limiting", improving regulation quality and safety margin.
Special note: the working power supply of the regulator must correspond one-to-one with the power supply of the controlled load; otherwise, phase inconsistency between the two power supplies may cause the load voltage to fail to switch off or fail to fully turn on.
Main Technical Indicators: 1. Input signal: 0～10mA (input impedance 800Ω); 4～20mA (input impedance 250Ω); 2. Output pulse: amplitude ≥3V, width ≥40μs (at 20Ω load); 3. Maximum conduction angle: ≥150°; 4. Overcurrent protection current (special order): determined by the external current transformer specification (without a current transformer, there is no overcurrent protection function); 5. Instrument working power: default AC 220V±15%, approx. 3VA; 50Hz±1Hz; AC 380V and other power supplies must be declared at order time
Product Models, Dimensions, Functions and Matched Secondary Instruments. Dimensions are W×H×D (mm). Model / Overall Dimensions / Cutout Dimensions / Functions and Matched Secondary Instruments: ZK-1 160×80×130 152×76 controls single-phase loads, matched with XMT-19□, XT-79□□ instruments; ZK-3 160×80×130 152×76 controls three-phase loads, matched with XMT-19□, XT-79□□ instruments; ZKS-1 80×160×130 76×152 controls single-phase loads, matched with XMTS-19□, XT-79□□ instruments; ZKS-3 80×160×130 76×152 controls three-phase loads, matched with XMTS-19□□, XTS-79□□ instruments; ZKA-1 96×96×130 92×92 controls single-phase loads, matched with XMTA-19□, XTA-79□□ instruments; ZKA-3 96×96×130 92×92 controls three-phase loads, matched with XMTA-19□, XTA-79□□ instruments
