Output Relays; Switch Inputs (Optional) - GE Multilin PQM Instruction Manual

ELECTRICAL
2.2.5

Output Relays

2.2.6 Switch Inputs
(Optional)
2–16
Courtesy of NationalSwitchgear.com
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 –13 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 contact
wiring depends on how the relay operation is programmed in the
setpoint group (see Section 4.4: S3 Output Relays on page –37).
• 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
S3: OUTPUT RELAYS \ ALARM RELAY \ ALARM OPERATION
relay through the
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
RESET
alarm relay. Refer to Section 5.3.1: Alarms on page –21 for all the displayed alarm
messages.
• AUXILIARY RELAYS 1,2,3 (OPTION) (Terminals 34 to 42): Additional output relays can
be configured for most of the alarms listed in Section 5.3.1: Alarms on page –21. 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 auxiliary
relays can also be programmed to function as kWh, kvarh, and kVAh pulse outputs.
With the control (C) option installed the PQM has four programmable switch inputs that
can be used for numerous functions. The figure below shows the internal circuitry of the
switches .
ISOLATED
POWER
SUPPLY
FAIL-SAFE
PQM
TYPICAL
SWITCH
TERMINALS
+24VDC
COM
FILTER
TO LOGIC
OPTO
ISOLATION
10mA
PULSED
FIGURE 2–11: Switch Input Circuit
PQM POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
S3: OUTPUT RELAYS
operation for the alarm
EXTERNAL
SWITCH
IN