Transformer Sizing - Emerson Epsilon EP Drive 400518-01 Installation Manual

Safety Information Product Overview
DISTRIBUTION PANEL
> 140 Vac
EARTH
GROUND
Figure 12:
Figure 13:

Transformer Sizing

If your application requires a transformer, use the following table for sizing the KVA rating. The values in the table
are based on "worst case" power usage and can be considered a conservative recommendation. You can down-size
the values only if the maximum power usage is less than the transformer continuous power rating. 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.
14
Installation
3 Ø Isolation Step Down Transformer
Grounded WYE Distribution >140 Vac Phase to Neutral. Recommend Using
Step Down Transformer so Line to Line is 240 Vac or less.
Single Phase Power Supply Connections
Diagnostics
(Protective Earth)
Fuse
L1
To Drive
Terminals
L2
Fuse
L1
To Drive
Terminals
L2
Fuse
Options and
Specification
Accessories
L3
L2
To Fusing and
Drive Terminals
L1
N
PE