IDEC GT3 Series Instruction Sheet
GT3 Series Instructions
Instructions: Wiring Inputs for GT3 Series
Inputs Inputs
To avoid electric shock, do not touch the input signal terminal during power voltage application.
When connecting the input signal terminals of two or more GT3A timers to the same contact or transistor, the input terminals of the same number should be connected. (Connect Terminals No.2 in common.)
[Incorrect]
Input
Switches & Pilot LightsDisplay LightsRelays & SocketsTimersTerminal Blocks
Contact or Transistor
In a transistor circuit for controlling input signals, with its primary and secondary power circuits isolated, do not ground the secondary circuit.
GT3 Series
Timer
Input
Terminal
10
2
Input
Terminal
10
2
GT3 Series
Timer
Input
Terminal
Circuit
Rectifier
Circuit
Insulating Transformer
Power
Power
[correct]
Input
Terminal
10
2
Input
Terminal
10
2
Power
Timers
Connect the input signal terminals of the GT3A timers to Terminal No.2 only. Never apply voltage to other terminals; otherwise, the internal circuit may be damaged.
R
5, 6, and 7
Input Terminal
210
Y
Power
Input signal lines must be made as short as possible and installed away from power cables and power lines. Use shielded wires or a separate conduit for
input wiring.
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Timers
GT3 Series Instructions
Inputs Instructions, continued
For contact input, use gold-plated contacts to make sure that the residual voltage is less than 1V when the contacts are closed.
6
5
7
4
Reset Input
Start Input
3
Gate Input
For transistor input, use transistors with the following specifi cations; VCE = 40V, VCES = 1V or less, IC = 50 mA or more, and ICBO = 50μA or less. The resistance
should be less than 1kΩ when the transistor is on. When the output transistor switches on, a signal is input to the timer.
Reset Input
Start Input
Gate Input
Inputs: GT3A-1, -2, -3
Transistor output equipment such as proximity switches and photoelectric switches can input signals if they are voltage/current output type, with power voltage
ranges from 18 to 30V and have1V. When the signal voltage switches from H to L, a signal is input to the timer
Transistor Output
Circuit
2
111
Power
4
3
2
6
5
111
Power
8
9
10
7
8
9
10
Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks
Transistor
5, 6, 7
Input
Terminal
2
Inputs: GT3A-4, -5, -6
Start Input
Reset Input
Gate Input
The start input initiates a time-delay operation and controls
output status.
When the reset input is activated, the time is reset, and
contacts return to original state.
The time-delay operation is suspended while the gate input
is on (pause).
No-voltage contact inputs and NPN open collector transistor inputs are applicable.
24V DC, 1mA maximum
Input response time: 50msec maximum
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