2-14 PQM Power Quality Meter GE Power Management
2.2 ELECTRICAL 2 INSTALLATION
2
2.2.5 OUTPUT RELAYS
The basic PQM comes equipped with one output relay; the control option supplies three additional output
relays. The PQM output relays have form C contacts (normally open (NO), normally closed (NC), and common
(COM)). The contact rating for each relay is 5 A resistive and 5 A inductive at 250 V AC. Consult Section 1.3:
SPECIFICATIONS on page 1–11 for contact ratings under other conditions. The wiring diagrams show the
state of the relay contacts with no control power applied; that is, when the relays are not energized. Relay con-
tact wiring depends on how the relay operation is programmed in the
S3: OUTPUT RELAYS
setpoint group (see
Section 4.4: S3 OUTPUT RELAYS on page 4–34).
•
ALARM RELAY (Terminals 43 / 44 / 45):
A selected alarm condition activates the alarm relay. Alarms can
be enabled or disabled for each feature to ensure only desired conditions cause an alarm. If an alarm is
required when control power is not present, indicating that monitoring is not available, select
FAIL-SAFE
operation for the alarm relay through the
S3: OUTPUT RELAYS \ ALARM RELAY \ ALARM OPERATION
setpoint.
The NC/COM contacts are normally open going to a closed state on an alarm. If
UNLATCHED
mode is
selected with setpoint
S3: OUTPUT RELAYS \ ALARM RELAY \ ALARM ACTIVATION
, the alarm relay automatically
resets when the alarm condition disappears. For
LATCHED
mode, the key must be pressed (or
serial port reset command received) to reset the alarm relay. Refer to Section 5.3.1: ALARMS on page 5–
20 for all the displayed alarm messages.
•
AUXILIARY RELAYS 1,2,3 (OPTION) (Terminals 34 to 42):
Additional output relays can be configured for
any of the alarms listed in Section 5.3.1: ALARMS on page 5–20. When an alarm feature is assigned to an
auxiliary relay, it acts as a control feature. When the setpoint is exceeded for a control feature, the output
relay changes state and the appropriate AUX LED lights but no indication is given on the display. The aux-
iliary relays can also be programmed to function as kWh, kvarh, and kVAh pulse outputs.
RESET
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