Usage:UPS 250 APZ
View of 4-Wire Zig Zag Transformer|
(1) Zig Zag Transformer
The "T5" Zig Zag Transformer is located on the floor of the SMS Cabinet in a 4-wire installation. The "T5" Zig Zag Transformer 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
View of the 3-Wire Zig Zag Transformer Rear Panel|
(2) Zig Zag Transformer
Removal of the Zig Zag Transformer and installation of the Zig Zag Transformer are not field service procedures. Contact your Caterpillar technical support.
There is a
- The switch will close.
- The circuit breaker will trip.
- The circuit breaker will shut down power to the transformer.
There are three circular 5000:1 Current Transformers (CTs) surrounding each of the Zig Zag Transformer Phase cables located at the bottom of the cabinet in a 4-wire installation. These current transformers relay a telemetry signal to the Zig Zag Controller board (ZZC).
View of the 3-Wire Zig Zag Wire Connections|