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A-TB72/72Q Flat Time Switches (Flush-Mount Type, Direct Mount Type)

Cautions For Use

Precautions in Using A-TB Time Switches (common)

For cautions regarding each product, please refer to the respective "Precautions in using" sections.

CAUTIONS FOR USE

  • Use the time switch in ambient temperatures of -10 ℃ to +50 ℃ +14 ℉ to +122 ℉.
  • Use Time Switch in ambient humidity of 85 % R.H. or less.
  • Prevent using Time Switch in such places where inflammable or corrosive gas is generated, much dust exists, oil is splashed and considerable shock and vibration occur.
  • Since the main body cover is made of polycarbonate resin, prevent contact with organic solvents such as methyl alcohol, benzine and thinner, or strong alkaline materials such as ammonia and caustic soda.
  • External surge protection At a standard waveform the voltage of surge resistance against external surges is 4,000 V (7,000 V for Flat Time Switch), however, a surge voltage in excess of that may damage the internal circuit, therefore, please use a surge absorbing element.
  • Provide chattering absorbing circuit to control the circuit in which chattering is a problem.
  • Provide circuit breaker, fuse or other protective devices for the side of power supply.
  • The power failure compensation function provides compensation if power is supplied continuously to the time switches. The internal battery is fully charged, but if the battery capacitance has dropped because of natural discharging, or if the battery has discharged completely, there may be times when the switch does not operate immediately when the power is turned on. If this happens, check to make sure that the clock is operating normally immediately after the power is turned on, and then set the clock to the proper time.

LIFE FOR TIME SWITCH

Item Average life Conditions
Contact switching times Approx. 2 x 104 times Resistive load 250 V AC 15 A
Years of use (Note) Approx. 5 years Normal temperature (+25 ℃ +77 ℉)

When the value on the left has been reached, we recommend replacing the product with a new one.

Note :Average working life will decrease the higher the operating temperature gets (20,000 hours when +50 ℃ +122 ℉).

PRECAUTIONS CONCERNING WIRING

Connections should be made using wiring of Ø 1 to Ø 1.6 Ø 0.039 to Ø 0.063, or 1.25 to 2 mm2 2 to 3 x 10−3 in2, with a 600 V vinyl insulating sheath.

If connecting wires just as they are
Using crimp terminals

Use a crimp terminal with an insulating tube and an open tip (for M3.5 screws).

CONNECTION METHODS

Note :Please remove the crossover (dotted line) connected to the electromagnetic breaker with case cover.

A-TB72/72Q Flat time switches Caution for use

A-TB72/72Q Flat Time Switches have been discontinued on September 30, 2018.

Output setting

  • ON setting: Turn the setting element inward, and red mark appear around the dial.
  • OFF setting: Turn the setting element outward, and the above red mark will disappear.
  • Turn the setting element sufficiently until the click action is felt.

Clock setting

  • Be sure to turn the knob at the clock center in the arrow direction to set the clock to the present time. (The dial also turns together with the clock.) Be sure to prevent reverse turning.
  • Do not turn the dial to set the clock.

Attachment

  • Insert Time Switch from the front of the attachment panel. (One-touch system: Flush mounting type)
  • Either use 3.8 or M4 wood screws for attachment, or use DIN rails with a width of 35 mm 1.378 in (AT8-DLA1). (Surface mounting type)

Contact relay operation if the power fails

  • Contact relays remain closed while the power is off.

Power failure compensation (A-TB72Q)

  • An internal secondary (Ni-NH) battery is provided to compensate for power failures, but the power supply should be left on as much as possible. Turning the power supply on and off shortens the service life of the battery.
  • After continuous charging for 48 hours, the battery provides 200 hours of power failure compensation. The internal battery is fully charged, but if the battery capacitance has dropped because of natural discharging, or if the battery has discharged completely, there may be times when the switch does not operate immediately when the power is turned on. If this happens, set the clock to the proper time after the power has been back on for three to four hours.
  • Secondary batteries are a valuable commodity which can be recharged. They cannot be replaced, but if being discarded after use, please make sure they are recycled if possible. When discarding the battery, turn off the power supply to Time Switches, and use radio pliers to disassemble the overall connections and remove the battery.

Precautions concerning wiring

With flush mounting types, wiring should be connected by soldering it directly, or using the #187 flat connecting element provided as an accessory.

Compliance with the CE marking

Abide by the following installation conditions and cautions in order to satisfy EN61812-1 requirements.

  • Overvoltage category II,
    pollution level 2
  • Wiring
    The voltage applied to the timer should be protected with an overcurrent protection device (example: T 1A, 250 V AC time lag fuse) that conforms to the EN/IEC standards.
  • Installation and removal
    1. Panel-mounted models are timers for installing on the surface of the control panel. Store the terminal section inside the control panel.
    2. Direct-mounted models are timers for installing inside the control panel. Do not touch the terminal section or other parts of the timer unit while an electric current is applied.
    3. Before installation or removal, confirm that there is no voltage being applied to any of the terminals.
  • Do not use this timer with a safety circuit. For example, when using a timer in a heater circuit, etc., provide a protection circuit on the machine side.

Applicable standard

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