First, the main features of

      D30F-3 digital speed signal monitoring device is designed specifically for hydroelectric power plant, for monitoring turbine speed, speed percentage, the frequency of industrial intelligent instrument. Control signal can be used from the generator terminal voltage transformer voltage signal; proximity switch can be applied mechanical pulse signal, you can also use the voltage signal and the pulse signal to control. And in accordance with user needs can be one of the main control signal set, when the signal fails, the instrument will automatically switch to another signal speed detection, speed control unit to ensure the continuity and stability.
      D30F-3 contains seven relay output contacts can be used to boot up Process, respectively, in the governor input, input device over the same period, the unit too fast alarm, alarm and runaway speed electrical braking during deceleration, mechanical braking inputs and shutdown control. The status of the seven relays, respectively, seven by the instrument panel LED indication, seven road action value can be arbitrary. Set the parameter values stored by the E2prom with power protection.
Instrument has intuitive speed figures show the percentage of light beam and the speed display, speed of transmission current and additional communications, anti-interference ability, high reliability, common good, is the speed of the relay replacements.

Second, the type and function

Third, technical indicators

1 Power supply:
       a. AC-DC Voltage: 85 ~ 265V AC 110 ~ 250V DC
       b. Power consumption: ≤ 5W
2, the use conditions:
       Ambient temperature: -20 ~ 50 ℃, relative humidity ≤ 85%, non-corrosive gas
3, measurement accuracy: 0.1
4, the rated speed signal frequency can be set arbitrarily
5, control mode:
      a. D30F-3A × type according to the voltage control signal
      b. D30F-3B × type of control under the speed pulse signal
      c. D30F-3C × type according to the voltage signal and the combination of speed control pulse signal, can be selected by the voltage signal-based or pulse-based control. When a signal failure, automatically switches to another signal
6, input signal:
      a. signal input terminal voltage range of 0.2 ~ 100VAC
      b. pulse signal input range of 0 ~ 100Hz
7, output:
      a. Output contact capacity: resistive load 5A/220VAC
      b. seven groups of factory standard relay point: 5,35,50,80,95,115,140%
      c. Analog Output: 0 ~ 10mA load ≤ 1.5kΩ; 4 ~ 20mA load ≤ 750Ω (optional)
8, Display: unit speed, frequency, speed percentages, speed, frequency, and speed the maximum percentage of
9, size: 160 × 80 × 140 (mm) (W × H × D)
10, hole size: 152 +1 × 76 +1 (mm) (W × H)