# Wiring the RDC6432 to the LSU - No firing

**URL:** <https://forum.cloudray.com/t/wiring-the-rdc6432-to-the-lsu-no-firing/1509>\
**Category:** Laser Power Supply\
**Created:** [July 30, 2024, 9:26am UTC](https://forum.cloudray.com/t/wiring-the-rdc6432-to-the-lsu-no-firing/1509 "2024-07-30T09:26:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![eastmount](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/eastmount/32/860_2.png) [@eastmount](https://forum.cloudray.com/u/eastmount)\
**Post date:** [July 30, 2024, 9:26am UTC](https://forum.cloudray.com/t/wiring-the-rdc6432-to-the-lsu-no-firing/1509/1 "2024-07-30T09:26:11Z")

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Hey there.

I have just come to the exciting part of my laserbuild where I should be able to fire the laser.

I have followed the diagrams i the RDC6432G manual connecting wp to a flow sensor, and the ext run to the door - they both say error when activated. But when I push the test button or the pulse on the screen, nothing happens. if I run a testcut, the same. No firing… How can I test if the powersupply (cloudray 40w 115v/230v) does indeed work???

I have connected:  
AC  
AC Mains input  
Earthing(ground)  
Anode through AMeter  
(the green led is on)

Then there is a connection from  
the controller PWM to IN on the LPSU  
and the (minus/common ground)from controller is connected between the  
and then the l-on to K+ on the LPSU

Any help appriciated!!

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<div class="post-metadata">

**Author:** ![eastmount](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/eastmount/32/860_2.png) [@eastmount](https://forum.cloudray.com/u/eastmount)\
**Post date:** [July 30, 2024, 10:19am UTC](https://forum.cloudray.com/t/wiring-the-rdc6432-to-the-lsu-no-firing/1509/2 "2024-07-30T10:19:16Z")

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I actually found the solution on my own - so for others having this issue!

Remenber to short the WP to ground on the LPSU for controller firing!