Emerson 400518-01 AC Power Requirements, AC Supplies NOT Requiring Transformers

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Specification

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.

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.

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.

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.

DISTRIBUTION PANEL

SECONDARY

EARTH

GROUND

	L3
	L2
Typ. 208 Vac	To Fusing and
	Drive Terminals

L1

120 Vac

PE

(Protective Earth)

N

Neutral is used only when 120 Vac operation is desired. It is never fused.

Figure 7: Earth Grounded WYE Distribution Transformer, 120/208Y 3Ø

Installation 11