Braking System for Power Outage and/or Electronic Control Fault - Electrician Talk - Professional Electrical Contractors Forum
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Old 03-30-2019, 09:53 AM   #1
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Default Braking System for Power Outage and/or Electronic Control Fault

Hi I wrote this:
can-we-use-general-purpose-inverter-crane-

It is done but still having many problems after another.

I read ASME code in:
****

I did not find the regulation of a braking system to conduct when Power is out and/or Electronic Control Fault, especially when a Luffing Jib Boom is Hoisting / Lowering Down a load in its maximum operational speed.

What I know is:
Avoid sudden crane acceleration and deceleration when moving suspended loads.

My Ship Unloading Luffing Crane spec's is:
All the winch drum has no mechanical brake at all.
Each motor has a Single Electrical Mechanical Holding Brake.
The controlling / load braking system is controlled by VFD / Inverter.
Luffing jib length = 38.8 m
Luffing jib weight = 3 ton
Load weight = 9 Ton (Bucket and Coal), will carry by Hoisting dan Grabbing motor.
Angle of Jib's operation = 52 to 80 deg
Luffing motor power is 55 kw with total gear and pulley ratio of 1:400
A Frame height at the back of the platform's deck is only 5.5 m, while others about 12 m or more. (Italgru has the highest A Frame up to 28 m for its marine / offshore crane)

So the problem is: When the power is out while a 9 ton load is in its maximum speeding down action, then the holding brake motor will suddenly close automatically, what will happen?
I think it will be a catastrophic accident. So what is the Code conducts or regulation for this problem?

Please advise me.
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Old 03-30-2019, 10:00 AM   #2
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Call a crane guy.
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Old 03-30-2019, 11:01 AM   #3
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Please take a few minutes and fill out your profile.
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Old 03-30-2019, 01:12 PM   #4
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There are some crane guys on here. Hopefully one will chime in.
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Old 03-30-2019, 09:05 PM   #5
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Herb
Thanks for taking the time to fill out your profile.
The only one that can help you is the manufacturer. The OEM.
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Old 04-05-2019, 07:55 AM   #6
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Quote:
Originally Posted by John Valdes View Post
Herb
Thanks for taking the time to fill out your profile.
The only one that can help you is the manufacturer. The OEM.
My main problem is,
our subcon is a DIY and not refer to any crane's designs or standard brands exitsing.

They already run away.
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