Important: PLH3D-15W-Series engraving laser head should be powered with a high-quality power supply without anything else connected. Please note: connecting the laser head to the same power supply unit as a stepper motor or any other high-impedance equipment is not recommended. Doing so may cause irreversible damage to laser diodes.


Important: Do not connect both Modulation Input #1 and Modulation Input #2 at the same time. Doing so may result in the malfunction of the laser head.

Modulation Functionality

Engraving Laser Head

Modulation Input 1

Modulation Input 2

PLH3D-15W Series

0 – 5 V Analog Signal

0 – 5 V TTL/PWM Signal

0 – 5 V TTL/PWM Signal

0 – 10 V TTL/PWM Signal

0 – 24 V TTL/PWM Signal


Modulation Input #1:

Modulation Input #1 accepts Analog, Pulse-Width Modulation (PWM) and Transistor-Transistor Logic (TTL) signals. The operating range of Modulation Input 1 is 0 – 5 V. If it is connected to a signal with a slightly higher voltage, e.g., 0 – 10 V, only the 0 – 5 V portion of the signal will affect the laser output power. The voltage connected to this input should never exceed 10 V.


Modulation Input #2:

Modulation Input #2 accepts PWM or TTL signals. Examples of compatible control signal ranges are: 0 – 5 V, 0 – 10 V and 0 – 24 V. For control via PWM, we recommend using a base frequency of 5,000 – 10,000 Hz. While frequencies such as 1,000 Hz can also work, higher frequencies typically produce better grayscale images. Duty cycle % will correspond to the optical output power %.


Specification of Modulation Input #2 are following:


Parameter

Test condition
@ Ta = 25°C

Min. Voltage 

Typ. Voltage 

Max. Voltage 

Units


High level input voltage

 Vcc = 12 V

Vcc = 24 V

2.5

-

-

V

Low level input voltage

Vcc = 12 V

Vcc = 24 v

-

-

1.0

V