Sensor Rack Phasing
What is Phase Balancing?
There are two ways in which a Sensor rack can be phase balanced, straight or balanced.
Phase balancing refers to way in which the circuits are landed in the rack.
Straight: Circuits are numbered from top to bottom straight down the rack. Mainly used in architectural and touring situation.
Balanced : The circuits are evenly Distributed across the phases. That way circuits can be sequential on a location or postilion but are evenly distributed across the phases
Unison racks can be Phase Balanced as well, but since they are mainly architectural, they are usually straight.
Below are examples for common 3 phase racks. This will differ if racks are single phase (two hot legs) Signal phase rack are more common in smaller rack sizes that 48.
Straight Phasing in an SR48
In the above example circuits 1 - 32 land on phase A.
Circuits 33- 64 land on phase B.
Circuits 65-96 land on phase C.
This is an example of straight phasing
Balanced Phasing in an SR48
In the above example notice that circuits are not in numerical order.
Phase A contains circuits 1,2,7,8...
Phase B contains circuits 3,4,9,10...
Phase C contains circuits 5,6,11,12...
This is an example of balanced phasing in which the load is distributed between the phases.
Green and Yellow highlights are used illustrate a single density dual circuit module.
Other Rack Types
SR24
SR24 (Straight) SR24 (Balanced)
Green and Yellow highlights are used illustrate a single density dual circuit module.
SR12
SR12(Straight) SR12(Balanced)
Green and Yellow highlights are used illustrate a single density dual circuit module.
SR6
SR6 (Straight) SR6(Balanced)
Green and Yellow highlights are used illustrate a single density dual circuit module.
Attached is a Excel Spreadsheet that will automatically readdress a rack and show you the phasing and distro cards . Great for troubleshooting. And yes there are 36/72 rack mainly for Europe and Classic Sensor touring.