Bridgeport Haidenhain Traverse Reference Problem

[wahidbashir]

Hello to all forum members,
On Bridgeport VMC with haidhenhain control 307, when i starts machine home then z axis is coming down,
Before this, machine z axis was going up towards referenc switch, I cheked switch continuity and 24 Volts are coming when it operates
what should i do , Any help will be appriciated ?
wahid bashir

[gus]

If this has happened suddenly, I would suspect it is the trip dog switch. There are probably overtravel limit switches on each end of travel[they are not normally ever hit] and then a trip dog at the z+ direction. If that switch is jammed or shorted, it will do as you describe. If parameters have been changed or some other problems, it may be a different problem

[wahidbashir]

Thanks for ur answer
I Checked end limit swithces and they are fine. operator of mahcine is saying that he had mistakenly changed some paramters but do not remeber.
What are the parameters regardings to this specific control to be checked ?
With best wishes

[wahidbashir]

Problem has been partially solved by changing parameter MP1320 . Now machine is moving its z axis in + direction towards up but on touching the refence switch it is not being home and continue to move in the same direction.
Control first i wrote mistakenly 307 but it is actually 370 haidenhain.
The other two axis X & Y are OK and comes to theire home position.
The reference switch is working properly. Please guide me in this regard
wahid bashir

[gus]

If it was seeing the trip dog[ a separate switch from the limit switch] it would reverse the direction of travel when it hit it. I still suspect the switch

[gus]

I believe this control may have the 'trace' function in the plc section code 807667 and 'trace'

Of course you have to figure out which 'I' is the z trip dog......

[wahidbashir]

Thanks U very much Gus i will check it and then tell

[wahidbashir]

Dear Gus,
There i saw only one switch on z axis, which type of it ?

[wahidbashir]

The problem occured after power interruption of main line.
I have read in a service manual following.

If after power on of the machine no or not all reference marks were traversed (e.g., due to a previous change to another operating mode) with

PASS OVER REFERENCE MARK the
reference mark traverse must be activated. Select the manual operating mode and press the
soft key.

--> Traverse reference points appears on the screen.
What you say in this regard.

[wahidbashir]

Thanks for ur kind reply.
By seeing into more depth, the distribution for input/output board was found faulty. Repaired it and Now Machine Is Ok