Chapter 3 Description - THORLABS SHB05 User Manual

Ø1/2" Shutters and Controller Chapter 3: Description
Chapter 3 Description
The SHB05 and SHB05T are one-half-inch-aperture, high-speed, bladed shutters,
driven by the included shutter controller. The shutter connects to the controller
through a shielded four-conductor cable using a four-pin, mini-DIN connector. The
included controller provides the drive levels required for optimal performance and
monitors the state of the shutter. The controller has a BNC connector for external
modulation, and an interlock output jack for safety. A switching power supply is
included.
The SHB05(T) can be controlled directly from the buttons on the controller or via an
external modulation source. There are two buttons on top of the controller unit, one to
turn the power on and off and the other, labeled as ENABLE, to open or close the
shutter. When the unit is first powered on, it is in the mode it was last, either Manual
or External Modulation Mode expecting input from the external modulation port.
Manually depressing the ENABLE button will open and close the shutter. To use the
modulation input, press and hold the ENABLE button for 3 seconds.
The external modulation port can drive the shutter up to a maximum frequency of 25
Hz. In normal operation, when the logic of the external modulation pulse is high, the
shutter will open. When it is low, the shutter will be closed. In normal operation, the
shutter will shut down if it is run at its max frequency for too long to prevent
overheating. In Unprotected Mode, this safety feature is disabled and the unit may be
damaged if run too long without thermal control.
The SHB05(T) has many safety features. The controller detects the state of the
shutter using an internal optical sensor inside the shutter package. The optical sensor
detects the shutter blade's position, confirming if the shutter is open or closed. This
feature, when used with the interlock connector, makes this shutter ideal for
applications where a laser safety lockout is required. In the event of a failure such as
a blade jam, the SHB05(T) will shut down. This changes the state of the interlock and
LED light will turn red. The SHB05(T) can detect when the blades are not operating at
the set frequency and will shut down to prevent damage to the SHB05(T).
The SHB05(T) come with the shutter head, controller, external switching supply, AC
cord, and this manual.
Rev F, December 9, 2018 Page 5