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Astronomical time switch ETC1

Astronomical time switch ETC1

The ELHART ETC1 dual-channel astronomical time switch is designed to control actuators according to the operating schedule stored in the device memory. This schedule is based on the time of day, day of the week, month, and year, as well as sunrise and sunset.

The ETC1 is an astronomical time switch (astronomical timer) that automatically calculates sunrise and sunset times for the current calendar date using the latitude, longitude, and time zone of the installation site.

Time setting resolution is 1 minute. However, thanks to the "Pulse" mode, the output ON-time can be configured in seconds.

The ETC1 astronomical timer features two outputs that can operate independently or in parallel under the first logic unit. Operating in parallel allows controlling multiple devices with different supply voltages.

The timer is equipped with two digital inputs accepting dry contact, NPN, and PNP signals for Forced ON and Forced OFF output control.

Modifications Where to buy?

Real-time timer 2-channel ETC1-D2-R
ETC1-D2-R
  • Design: size D2 (DIN-rail mount, 90.2×36.3 mm)
  • Inputs: 2×digital
  • Outputs: 2×relay (R)
  • Functional diagram of the ELHART ETC1 astronomical timer
    Functional diagram of the ELHART ETC1 dual-channel astronomical timer
    Functional diagram of the ELHART ETC1 dual-channel astronomical timer
  • Features of the ELHART ETC1 dual-channel astronomical timer
    • Built-in real-time clock (RTC).
    • 2 independent channels, each with 50 program steps based on time of day, sunrise, sunset, and days of the week, month, or year.
    • Sunrise and sunset control during polar day and polar night.
    • Minimum switching time from 1 second.
    • Priority scheduling support for special operation modes (e.g., maintenance, weekends, holidays).
    • Digital inputs compatible with dry contact, PNP, and NPN signals for forced output override (ON/OFF).
    • Wide operating temperature range: −20 to +50 °C.
    • Compact DIN-rail mount housing.
    • Displays current time, day of the week, and input/output status.
    • Easy configuration.
    • Manual output control mode.
  • Technical characteristics of the ELHART ETC1 series dual-channel astronomical timer
    Parameter Value
    Supply voltage 190…240 VAC / 50 Hz (Unom 220 VAC / 50 Hz)
    Power consumption 3 W
    Real-time clock (RTC) yes
    Built-in battery for RTC yes, CR2032
    Real time clock accuracy 30 s/month
    Number of independent channels 2
    Number of program steps 50 steps / channel
    Time setting range time of day: 00:00...24:00, h:min
    sunrise + offset: -9:59...+9:59, h:min
    sunset + offset: -9:59...+9:59, h:min
    pulse: 0…999, s
    Sunrise and sunset calculation accuracy 1 min
    Power reserve min 10 years
    Number of digital inputs 2
    Digital input type dry-contact, NPN, PNP
    NPN/PNP sensors supply voltage 10…30 VDC
    Number of outputs 2
    Output types electromagnetic relay (5 A at 250 VAC, 3 A at 30 VDC, resistive load), SPDT (NO+NC)
    Environmental conditions operating temperature: (-20...+50) °C
    storage temperature: (-20...+50) °C
    relative humidity: (0...80)% (without condensation)
    Weight 200 g
    Ingress Protection IP20
    Insulation category CATII (double insulation)
    Pollution degree 1
    CTI Material group IIIa
  • Connection diagram of the ETC1 dual-channel astronomical timer
    Connection diagram of the ETC1 astronomical time switch
    Connection diagram of the ETC1 astronomical time switch
  • Overall dimensions of the ETC1 dual-channel astronomical timer
    Overall dimensions of the ETC1 timer, mm
    Overall dimensions of the ETC1 timer, mm