Forkliftaction.com

Storing your login information automatically.

When you select the 'Remember me' option, your login information will be stored on your computer in the form of a cookie. When you visit Forkliftaction.com again, the stored login information will be retrieved automatically and you will not have to submit your login parameters (email address and password) each time you want to visit our members-only pages.

A cookie is a small piece of data that is sent to your browser from a web server and stored on your computer's hard drive. A cookie can't read data off your hard disk or read cookie files created by other sites. Cookies do not damage your system.

Marketplace

Business Directory

Discussion Forums

Spec-Checker

Industry News

Events Calendar

Jobs & Resumes

Photo Galleries


News service and business centre for materials handlingHOME
Search

DISCUSSION FORUMS : Forkliftaction.communicate

My forum profile

Printable version

Discussion Forums Home

Forum:

Mechanical Troubleshooting

Brand: Toyota - Model: 5FBC25

Number of messages: 6

START MESSAGE:

Davie
Ontario, Canada

This is a new one. I am trying to replace a back up alarm on this toyotaSo I hook it up 48vdc Put it in reverse works great (beep beep beep) then I use the hydraulics( SCR-Transistor I'm not sure) and it cuts out so I check for voltage drop and it drops a volt or 2. No big deal. I put it in rev and drive a bit and it cuts out.It cut out when the SCR is working. OK So I hook it up directly to the battery(beep, beep, beep) Touch the accel pedal or the hyd and it stops. I check voltage at alarm and there is 48 volts there but is dosn't work while in SCR range WTF And yes I removed the battery from the truck to remove stray battery volts from frame, Which there was alot. Isolated it with rubber and installed.

Posted 22 Jan 2010 00:15 AM

Report this message

REPLIES:

Sort replies by

edward_t
South Carolina, United States

when you say "hook it up 48vdc"; can you tell us where did you get battery negative, where did you get Battery positive.

-------------------------
webhome = http://forktechs.com
"it's not rocket surgery"

Posted 22 Jan 2010 04:37 AM

Report this message

Davie
Ontario, Canada

OK I eventually hooked the Back up alarm directly to the battery to test. I also hooked my meter to it as well So the back up alarm worked constantly until I either accelerated or used the hydraulics. I believe there is some kind of interference in this system. While hooked up this way I drove until 1A kicked in then it started working until I let it go back into scr range. So it only acts up when using the SCR Or transistor(not sure which one this is. I have tried putting a diode in the positive wire. I was going to try a different manufacturer for the Back up alarm. This Back up alarm SHOULD work. It should work from 24-48vdc

Posted 22 Jan 2010 09:14 AM

Report this message

edward_t
South Carolina, United States

on this bac-alarm, is there a metal tab attached to the negative connection screw/stud that also is bent around to allow the mounting hardware to go through a whole in the tab? on electric forklifts this tab must be removed.
are you saying that even with the alarm wired direct to the battery positive and battery negative heavy power cables, it does not beep continuously and is effected by the operation of the truck??
there may be some instructions around somewhere that show how to install a small diode and capacitor to act as a noise filter on the alarm's circuit to cut down the electrical noise that interferes with the alarms operation

-------------------------
webhome = http://forktechs.com
"it's not rocket surgery"

Modified 22 Jan 2010 09:59 PM
by poster.

Report this message

Davie
Ontario, Canada

On this back up alarm there is no ground tab. When I hook this back up alarm up directly to the battery posts it cuts out when I use a hydraulic function or drive. I belive it may have something to do with interference from the transistors or SCR's
Any Ideas???would be appreciated.

Posted 26 Jan 2010 04:08 AM

Report this message

mrfixit
New York, United States

I've seen this problem and it seems some alarms do pick up interference. I would try a different brand.

Posted 26 Jan 2010 09:41 AM

Report this message

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

FORUM GLOSSARY

Click for description.

FORUM

DISCUSSION

MESSAGES

NICKNAME

SIGNATURE

FORUMS

Discuss: Industry News & Whispers

Discuss: Conferences, trade shows & other events

Discuss: Mechanical Troubleshooting

Discuss: Technical arena. Did you know? Who knows?

Discuss: Machines. Forklifts, stackers, telehandlers, container handlers and reach stackers

Discuss: Business issues

Discuss: Safety, training & legislation

Discuss: Fun at work