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Selection of MPCB

Created by: PISCEAN 2010 at: 5/11/2014 2:15 PM (9 Replies)

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5/11/2014 2:15 PM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/14/2024 Posts: 8092 Rating: (878)	Hello Experts, On one of EOT crane, 20KW slipring induction motor is used for hoist operation. Its rated current is is 48A. 3VU16 series 36-52 A MPCB is used for over current protection. But this MPCB failes in duration of 6 months. The motor no load current is 20A where as on load max current drawn is 42 A. Current set on MPCB is 45 A. I am unable to understand the reason of failuer of MPCB when current values are nominal i.e. within permissible limit. Can any one help? Thanks in advance. DEEP.

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5/11/2014 8:26 PM	Rate (0)
Nicky123 Posts: 59 Rating: (2)	Please go through the below link: /tf/WW/en/Posts/92650 /tf/WW/en/Posts/71066
Nicky123 Posts: 59 Rating: (2)
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This contribution was helpful to 4 thankful Users P_PANDE @nkur jeet2907 Chetan2490

5/12/2014 5:56 AM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/14/2024 Posts: 8092 Rating: (878)	Hello Nicky123, Thank you for your reply. I want to know the reason of failuer of MPCB, is it because of wrong type or inadequate capacity? Hope now it is quite clear.

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5/14/2014 1:28 PM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/14/2024 Posts: 8092 Rating: (878)	PISCEAN 2010 Hello Experts, On one of EOT crane, 20KW slipring induction motor is used for hoist operation. Its rated current is is 48A. 3VU16 series 36-52 A MPCB is used for over current protection. But this MPCB failes in duration of 6 months. The motor no load current is 20A where as on load max current drawn is 42 A. Current set on MPCB is 45 A. I am unable to understand the reason of failuer of MPCB when current values are nominal i.e. within permissible limit. Can any one help? Thanks in advance. DEEP. Does any body has faced similar proble? Want to coment/share views?

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5/18/2014 1:42 PM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/14/2024 Posts: 8092 Rating: (878)	PISCEAN 2010 Hello Experts, On one of EOT crane, 20KW slipring induction motor is used for hoist operation. Its rated current is is 48A. 3VU16 series 36-52 A MPCB is used for over current protection. But this MPCB failes in duration of 6 months. The motor no load current is 20A where as on load max current drawn is 42 A. Current set on MPCB is 45 A. I am unable to understand the reason of failuer of MPCB when current values are nominal i.e. within permissible limit. Can any one help? Thanks in advance. DEEP. Hello Experts, Can I select the above MPCB i.e. 3VU16 for S4 duty slip ring induction motor? Thanks in advance. DEEP.

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5/18/2014 1:43 PM
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/14/2024 Posts: 8092 Rating: (878)	PISCEAN 2010 Hello Experts, On one of EOT crane, 20KW slipring induction motor is used for hoist operation. Its rated current is is 48A. 3VU16 series 36-52 A MPCB is used for over current protection. But this MPCB failes in duration of 6 months. The motor no load current is 20A where as on load max current drawn is 42 A. Current set on MPCB is 45 A. I am unable to understand the reason of failuer of MPCB when current values are nominal i.e. within permissible limit. Can any one help? Thanks in advance. DEEP. Hello Experts, Can I select the above MPCB i.e. 3VU16 for S4 duty slip ring induction motor? Thanks in advance. DEEP.

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5/18/2014 3:26 PM	Rate (0)
P_PANDE Posts: 72 Rating: (6)	Do you have technical catalog of MPCB? You can find from Google. Just see the same. I think you can use it.
P_PANDE Posts: 72 Rating: (6)
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5/19/2014 6:32 AM	Rate (0)
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	P_PANDE Do you have technical catalog of MPCB? You can find from Google. Just see the same. I think you can use it. Dear , Please follow below link.... https://www.automation.siemens.com/tf/WW/en/Posts/92650 https://www.automation.siemens.com/tf/WW/en/Posts/71066

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5/19/2014 12:03 PM

ashishmistry390

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PISCEAN 2010
Hello Experts,
On one of EOT crane, 20KW slipring induction motor is used for hoist operation. Its rated current is is 48A. 3VU16 series 36-52 A MPCB is used for over current protection. But this MPCB failes in duration of 6 months. The motor no load current is 20A where as on load max current drawn is 42 A. Current set on MPCB is 45 A.
I am unable to understand the reason of failuer of MPCB when current values are nominal i.e. within permissible limit.
Can any one help?
Thanks in advance.

DEEP.

Dear , Please follow below link.... /tf/WW/en/Posts/92650 /tf/WW/en/Posts/71066
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Dear MR.Ashish,

What is this??????????????

5/21/2014 8:46 AM

Chetan2490

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Joined: 5/12/2014

Last visit: 9/9/2020

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ashishmistry390
PISCEAN 2010
Hello Experts,
On one of EOT crane, 20KW slipring induction motor is used for hoist operation. Its rated current is is 48A. 3VU16 series 36-52 A MPCB is used for over current protection. But this MPCB failes in duration of 6 months. The motor no load current is 20A where as on load max current drawn is 42 A. Current set on MPCB is 45 A.
I am unable to understand the reason of failuer of MPCB when current values are nominal i.e. within permissible limit.
Can any one help?
Thanks in advance.

DEEP.

Dear ,

Please follow below link....

/tf/WW/en/Posts/92650

/tf/WW/en/Posts/71066

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