Fla, Current Setting %= FLAx N x, NT x 57.14/0

WIRING

Low-voltage power supply 600 V AC or less

(Notes) *Connections of control power source AC 100-120V-Terminals 1-2

AC 200-24®V-Terminals 1-3 For other volt ., use CPT.

`"Connections of output contacts NC-contact (opened when the 2E Relay operated)-Terminals 8-9 NO-contact (closed when the 2E Relay operated)-Terminals 9-10

-Connections of Remote reset switch

LOW-VOLTAGE

High-voltage power supply	PT or control transformer
2.4KV-13.8KV AC	(100-120V Secondary)

High-voltage CT secondary circuit wires pass through the windows of the built-in CT's.

HIGH-VOLTAGE

HOW TO SET

Selection of the suitable model may require some preli- minary calculations. See "Current Setting" to determine if the calculated "Current Setting %" can be obtained with the selected model given the motor full load current (FLA). Model Selection can also be influenced by wire size which limits the number of turns that can be passed through the CT windows .

(1)Current Setting

Nk I ) ® (2E AT Rating) x (External CT Ratio)

FLA

N(T)=Number of wire turns through 2E built-in CTs, round off to nearest integer.

(Current Setting %)= FLAx N x 100

(2E AT Rating) x (External CT Ratio)

Notes: "Select the external CT ratio so that the current setting % is as close to 100% as possible . If no external CT are used, substitute with "1 .0".

"For 1 .15 Service Factor Motors . If the motor has a 1 .0 S.F. multiply the calculated "Current Setting %" by 0.93. (Practice in USA)

Example: 200HP, 460V, 240A Full Load, 1 .15 S.F. Across-the-line start.

240 Amps exceeds the highest rated 2E Relay, therefore, external CT's must be used, and the HP1Y, 7 AT rated 2E, will be chosen as the standard model when the current exceeds the HP3Y's rating. If 300/5 CT's are used,

the Current Setting % = 240 x N(T) x 100% 7 x (300)

N(T) x 57.14®/0 .

And if 2 turns through the 2E Relay's CT windows (from the external CT's) are used, the % Dial

Setting = 2 x 57.14 =114% =110% or 115%

(2)Time setting

Determine the protection curve from 2E Relay operating curves, and read the operating time at 600% of setting current . Adjust the time setting dip switch to the nearest setting above the operating time.

RC820 specifications

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