Ge EPM 5200 User Manual download pdf (Page 18)

CHAPTER 3: ELECTRICAL INSTALLATION

EPM 5000 series Advanced Power Meters GE Multilin

3.7: Relay, Protection and Pulse Output

(This section applies only to the -NL or -NL2 Relay Option.)

EPM 5300P RELAY OVERVIEW

The EPM 5300P offers dry contact relay output capability. The EPM 5200P only offers KYZ pulse outputs and cannot

be configured to trip contacts on events.

FAIL-SAFE MODE: The EPM 5300P -NL option gives the user an adjustable tripping bandwidth. The

user specifies a range over which functions, such as frequency, phase relation and voltage, are

acceptable. The relay releases during times of normal operation, and engages when functions are

outside specified normal levels. The relay can be programmed to engage during normal operating

conditions, and release outside specified normal range (particularly when power is lost). This is the

fail-safe mode.

HYSTERISIS: The EPM 5300P -NL option also includes adjustable hysterisis. In addition to a time

delay on activating any contact, the user may specify a lower level to release the relay, rather than

releasing after the initial alarm point. This is ideal during load shedding when an alarm activates at a

certain level and the user does not want to turn off the alarm until a much lower, safer level.

SETABLE DELAYS: After reaching the alarm point, a change in relay status may be delayed for 255

seconds. The user also has the option of allowing the device to change relay status without any delay.

After the alarm condition passes, the relay can be stopped from returning to a normal condition for a

programmable time. Each delay time is independent of one another.

AND/OR LOGIC: If several parameters are assigned to one relay, the user can trip the relay if all

functions are out of limit (and programming), or if one function is out of limit (or programming). For

example, if limits on Voltage, Kilowatts, and Phase Imbalance are programmed and tied to Relay 1, the

user can either trip the relay if one function is out of limit, or if all functions are out of limit.

2 RELAYS & 1 KYZ PULSE OUTPUT -NL OPTION

The EPM 5300P's flexibility accesses a variety of relay options through the Programming Mode (see

programming sections). The relay option package consists of three relays: two can be dedicated to alarm

or controlled through communication (or both) and one for KYZ pulse output.

If the relays are controlled through communication, there are two different modes:

" Lock ON Relay will not be affected by any alarm condition.

" Lock OFF Relay will not be affected by any alarm condition.

If the relays are used for communication and alarm, there are four different modes:

" Lock ON Relay stays on regardless of any alarm condition.

" Lock OFF Relay stays off regardless of any alarm condition.

" Free ON Relay turns on unless other conditions force it off.

" Free OFF Relay turns off unless other conditions force it on.

Relay connection (see Figure 3.1, below): Form C relays, rated 250V, 5A–2 each.

KYZ relay output (Form C), rated 200V, 100mA–1 each.

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Ge EPM 5200 User Manual Page 18