Scrambler Timed Shutter Controllers

Table of Contents:

Introduction

A Uniblitz VED24 shutter controllers is located within the electronics drawer of the Vac Cart. This location was chosen due to a length restriction on the shutter cable between the VED24 and the shutter within the scrambler (Uniblitz said the maximum cable length was 30 ft).

The Scrambler Timed shutter is larger than the other shutters within the system, and as such requires different settings on its VED24 controller, as described below.

Relevant Devices

Relevant Functional Block Diagram

Cable Details

Photos of Devices

Installation Instructions

The shutter controller has a set of DIN “Function Switches” (second from right in image below) and an Octal switch for “Pulse Duration” (far right in image below) that need to be configured for the particular shutter being used:

The function switch

For the DSS25B shutters the function switch and pulse duration settings are:

Note the setting for Switch 1 does not depend on the shutter type, but should be set to ‘UP’ for ‘LOCAL’ (this disables the USB port and enables the BNC Pulse Input):

Note also that there is also a toggle switch on the front that sets the ‘Normally Open’ or ‘Normally Closed’ polarity of the switch (second from left in image above). The manual is not clear on how this affects a bi-stable shutter. For consistency within KPF, all shutter controllers should be set to ‘N.O.’. Each KPF VED has a label on the front to indicate this, as show in the picture above.

To manually operate a shutter, one can click the N.O./N.C. switch back and forth. However, be sure to leave it at ‘N.O.’ when done.

Relevant Datasheets & Manuals