Emerson 400518-01 - Manual (Page 23)

Installation 11
Safety Information Product Overview Installation Diagnostics
Options and
Accessories
Specification
AC Power Requirements
The Epsilon EP drives require 20 Vac to 264 Vac single phase power but, may operate on DC supplies, (See
Operation on DC Supply). An Epsilon EP drive can be connected to any pair of power phases on a 1 Ø or 3 Ø power
source that is grounded as shown in the following diagrams. Local electrical codes should be consulted before
installation.
When operating the drive at 90 V or less disable the Low DC Bus fault so the drive does not fault.
The maximum voltage applied to the drive terminals must not exceed 264 Vac phase to phase and phase to
PE ground. The AC supply must be earthed (type TN) with PE connected to the earthed point at the source,
which is usually a distribution transformer but could be a service entrance.
AC Supplies NOT Requiring Transformers
If the distribution transformer is configured as shown in the figures below, the AC power supply can be connected
directly to the drive terminals.
Figure 7: Earth Grounded WYE Distribution Transformer, 120/208Y 3 Ø
Fixed Protective Earth (PE) connections are mandatory for human safety and proper operation. These
connections must not be fused or interrupted by any means. Failure to follow proper PE wiring can cause
death or serious injury. This equipment has high earth leakage current and requires a redundant PE
connection from either terminal marked PE at J8 to PE connection point.
Where regeneration occurs, bus voltage will rise to 400 Vdc before shunt operation or a High DC Bus fault
limit voltage, whether shunt resistor is installed or not. Motors must have insulation rated for inverter duty at
240 Vac no matter what the operating voltage is, or bus voltage must be limited by other means.
DISTRIBUTION PANEL
SECONDARY
EARTH
GROUND
(Protective Earth)
Neutral is used only when 120 Vac operation
is desired. It is never fused.
L1
L2
L3
PE
N
Typ. 208 Vac
120 Vac
To Fusing and
Drive Terminals