Metal-sheet Double-feed Detector GD (Discontinued Products)

Placing of sensor heads

• Make the sender and receiver face each other and align their sensing center line.

• Keep a distance from any magnet or a device generating magnetic field. It may degrade the detectability.
• Surrounding metal influences the detectability. Please contact our office for more details.
• If more than one set of sensor heads are closely mounted, detectability may be affected. Please contact our office for more details.

Mounting sensor heads

<GD-3> Mounting with set screw

• Use a set screw (M3 or less), and the tightening torque should be 0.12 N·m or less.

<GD-10>

• The tightening torque should be 0.5 N·m or less.
• To mount the sensor head with a nut, the thru-hole should be ø3.4 mm ø0.134 in.

(The mounting board must be 2.3 mm 0.091 in, or less, thick.)

<GD-20>

• The tightening torque should be 11.2 N·m or less.

Mounting of controller

<On DIN rail> [1] With the stopper pressed in the direction of the arrow (it locks), fit the front portion of the mounting section of the amplifier on the 35 mm 1.378 in width DIN rail.

[2] Press and fit the rear portion of the mounting section on the 35 mm 1.378 in width DIN rail. * To remove, insert a “minus” screwdriver into the stopper and pull out.

<On board with screws> Use two M4 pan head screws 10 mm 0.394 in, or more, long. The tightening torque should be 1.2 N·m or less.

• The GD series has two sensing modes, one is the normal sensing mode and the other is the precise sensing mode. They are automatically selected by the characteristics of the object.

Normal sensing mode: The GD series goes into this mode when the number of objects (e.g., large metal sheets) is distinguished with relative ease.

Precise sensing mode: The GD series goes into this mode when the number of objects (e.g., lead frames) is difficult to distinguish. In this mode, the sensitivity difference is so minute between two sensing levels that vibration and temperature changes must be carefully managed.

• The sensing mode indicator lights up green during the normal sensing mode, but lights up yellow during the precise sensing mode.

• Teaching by external input

The teaching can also be performed by external input signals. Time chart

• As metals near the sensor head may affect the sensing performance, pay attention to the following points.

Influence of nearby metal

• The sensor head must be separated from nearby metal by a minimum distance as specified in the table below.

GD-3	GD-10	GD-20

Embedding in metal

• The sensing performance may be affected if the sensor is completely embedded in a metal. Keep a minimum clearance between the sensor head and the metal as specified in the table below.

GD-3	GD-10	GD-20

• When two or more sensor heads are mounted in parallel, keep a minimum separation distance as specified below to avoid interference.

In case the sender and another sensor’s receiver are placed adjacently

• GD-C2 can feed in the set level data into a PC or PLC memory using RS-232C serial communication and retrieve it whenever required. In this case, the taught data should be stored in the prescribed channel.

Transmission specifications

• Baud rate: Selectable from 300, 600, 1,200, 2,400, 4,800, 9,600, 19,200, 31,250 bits/sec.
• Format: Data bits・・・7 bits or 8 bits
  Parity check・・・None or Enable, Even or Odd
  Stop bits・・・1 bit or 2 bits
  Terminal code・・・CR or ETX

• The GD series constantly runs self-diagnosis, outputs　the result with self-diagnosis output, and lights the selfdiagnosis　indicator. In addition, error content is shown on　the channel display using error codes.

・Do not operate the sensor for a few seconds immediately after supplying power because of transient conditions including self-diagnosis time.

• Make sure to check the ability of the sensor to detect the number of sheets of your actual objects before use. If real objects differ from teaching samples in size or in characteristics, or the detecting condition deviates, an error may occur. Please note that magnetic metals or metals with low magnetic permeability such as steel especially have a strong tendency.
• In situations when magnets are in close proximity such as during electromagnet conveyance, this causes malfunctions due to electromagnetic disorder.
• When conducting minute detections, favorable sensing conditions are obtained only after having elapsed 60 min. after the initial introduction of the power supply.