Usage:UPS 250 APZ
View of the 4-Wire Zig Zag Transformer|
(1) Zig Zag Transformer
View of the 3-Wire Zig Zag Transformer Rear Panel|
(2) Zig Zag Transformer
The Zig Zag Transformer (T5) is located on the floor of the MMS System Cabinet in a 4-wire installation. The Zig Zag Transformer (T5) is located on the rear panel in a 3-wire installation.
The transformer is required for establishing the neutral point of the UPS 3-phase output when the following conditions occur:
- discharge mode of the system
- disconnection of the utility input
Removal of the Zig Zag Transformer (T5) and installation of the Zig Zag Transformer (T5) are not field service procedures. Contact your Caterpillar technical support.
Each of the three Zig Zag transformer cables has a 1500:5 current transformer (CT) installed on each of the cables. The CTs are located at the bottom of the cabinet in a 4-wire installation. The current transformers relay the flywheel telemetry to the board for the Zig Zag Controller.