Installation manual

Installation 17
Safety Information Product Overview Installation Diagnostics
Options and
Accessories
Specification
Figure 15: Grounded WYE Distribution >140 Vac Phase to Neutral. Recommend Using
Step Down Transformer so Line to Line is 240 Vac or less.
Figure 16: Single Phase Power Supply Connections
Transformer Sizing
If your application requires a transformer, choose a transformer with a continuous power rating greater then the
maximum power usage of the drive/motor combination. Other factors that may influence the required KVA rating are
high transformer ambient temperatures (>40° C or >104° F) and drive operation near the maximum speeds.
Transformer output voltage drop may become a limiting factor at motor speeds and loads near maximum ratings.
Typically, higher KVA transformers have lower voltage drop due to lower impedance.
When multiple drives are connected to a single isolation transformer, add the suggested KVA ratings of the drives
that would be operating simultaneously together for transformer sizing.
DISTRIBUTION PANEL 3 Ø Isolation Step Down Transformer
EARTH
GROUND
(Protective Earth)
N
L1
L2
> 140 Vac
L3
PE
To Fusing and
Drive Terminals
Fuse
L1
L2
To Drive
Terminal
s
Fuse
Fuse
L1
L2
To Drive
Terminal
s