Need help how to read electrical control diagram. 2

[munshe]

Hello Guys, I'm getting trouble in reading this diagram. can any one help me to read this 3 phase electrical motor control diagram, its belong to a ship anchor windlass system.to lift ship anchor.
system has three speed 3 phase ac motor and using dc source for motor braking.
thanks in advance
from munshe

 

[itsmoked]

That is showing what's called a two speed Dahlander connection. In one speed part of the windings are shorted together in the other speed they are powered. The third contactor swaps two legs to reverse the two speed motor in either direction.

I'm not really seeing a third speed anywhere.... Anyone else?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[waross]

Hi Keith. Look at the upper left detail.
Nine leads to the motor.
KM4
L14, L24, L34
KR2
8U, 8V, 8W
It looks like a two speed motor with an added winding for the third speed.
munshe
KM1, KM2 Forward and reverse.
Over on the upper right is a seven position switch.
Positions L3, L2, L1, Off, R1, R2, R3.
The black dots show which circuits are closed in which switch positions.
eg:
In position L3, the following sections are closed: SA3, SA5, SA6, SA7.
In position L2, the following sections are closed: SA3, SA5, SA7
Etc.
Is this what you are looking for?

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[ScottyUK]

The 7-position switch looks like forward and reverse selection for each of the three speeds, plus a centre off. Without analysing the circuit in detail I would guess the timers KT2 and KT3 ensure that high speed mode is reached only after stepping through the lower speeds first. A third timer KT1 appears to apply the brake gently then full on.


KA1 - trips on overload, manual reset

KM3 - low speed contactor for Dahlander winding in 'low' configuration

KM4 + KM5 - mid-speed contactors for Dahlander winding in 'high' configuration

KM6 - high speed contactor for separate winding

 

[munshe]

Sorry (Keith, waross and scottyuk) to reply you guys late.I just get on port after a long voyage.now I
understand little more then b4 how this circuit work,I appreciate your time .Working on ac generators there impedance are not matching getting hard time to operate in parallel.
Thanks guys for reply

 

[waross]

Thank you for your kind and courteous reply, munshe.

Bill
--------------------
"Why not the best?"
Jimmy Carter