Application  
GDC-GDP main applications are positioning, length measurement and numerical tachometry on continuous casting machines and hot and cold rolling mills.

Features
The Pulse Generators GDC-GDP have been designed for heavy industry. They are extremely robust and can sustain vibration and work in difficult temperature condition.

• Rugged and reliable under most difficult environmental conditions

• Cast aluminum housing

• Stainless steel shaft

• Water cooling version for ambient temperature up to 120°C

• Waterproof (IP66)

• Ambient temperature from –20°C to 80°C

Description      Up
The Pulse Generators GDC-GDP have an optical reading unit with single or multiple channels fitted with gallium arsenide photodiodes.

The beams of these LED are chopped by the opaque sections of a rotating disc, then detected.

Signals from each detector are processed by the built-in electronics. The output is high level pulses in complementary pairs. This enables transmission over large distances without disturbances even in electrically noisy environments.

Output channels:

• Single channel GDC-GDP with one output signal S1 are used when the drive only rotates in one direction or if  it is not necessary to detect the direction of rotation.

• Double channel GDC-GDP with two output signals offset by 90°, S1 and S2, can detect the direction of rotation. 

• Double channel GDC-GDP with a marker pulse (reference): the additional marker pulse S3, synchronized with the two output signals S1 and S2, enables counting full revolutions.

Diagram for clockwise shaft rotation as seen from the shaft.