What is a reverse load relay

Reloadron

Joined Jan 15, 2015
7,888
Reversing of a three phase motor involves reversing two of the three phases powering the motor. If we call the power L1, L2 and L3 going to the motor we would switch or reverse two phases to reverse the motor direction. For example L1, L2 and L3 become L1, L3 and L2. Using a relay to reverse two phases it becomes a reversing relay or you can also have a reversing switch. The end result is two of the three phases are reversed.

Ron
 

Thread Starter

Robesim

Joined May 1, 2017
144
Reversing of a three phase motor involves reversing two of the three phases powering the motor. If we call the power L1, L2 and L3 going to the motor we would switch or reverse two phases to reverse the motor direction. For example L1, L2 and L3 become L1, L3 and L2. Using a relay to reverse two phases it becomes a reversing relay or you can also have a reversing switch. The end result is two of the three phases are reversed.

Ron
Many thanks Ron
 

MaxHeadRoom

Joined Jul 18, 2013
30,655
This is not your average 3ph motor reversing relay, it has ability for communication with a local factory or industrial LAN network system.
And is in the same or similar extension of safety relays.
Max.
 

Reloadron

Joined Jan 15, 2015
7,888
Oh yeah, per Max this is not your average phase reversing relay. Relays like this use a computer interface system, for example RS 232 as the linked relay uses. These can tie into a network allowing engineering or maintenance to look at the load at any time and see data like apparent power, true power, leg voltages and a host of other important information including on time, reverse time expressed in hours resolving down to 0.1 hour. This allows the change and rework before certain pumps may fail or are due for periodic maintenance. We used Siemons but several companies manufacture them. They can be very beneficial in large systems.

Ron
 
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