GE PQMII - Output Relays; Switch Inputs (Optional)

2–14 PQMII POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
2.2.7 Output Relays
The basic PQMII comes equipped with one output relay; the control option supplies three
additional output relays. The PQMII 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 1.6: Specifications 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
S3 OUTPUT RELAYS setpoint group (see 5.4: S3
Output Relays for details).
• 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 ÖØ ALARM RELAY ÖØ 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 ÖØ ALARM RELAY ÖØ 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 6.3.1: Alarms for all the displayed alarm messages.
• Auxiliary Relays 1,2,3 (Optional; Terminals 34 to 42): Additional output relays can be
configured for most of the alarms listed in 6.3.1 Alarms. 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.
2.2.8 Switch Inputs (Optional)
With the control (C) option installed the PQMII has four programmable switch inputs that
can be used for numerous functions. The figure below shows the internal circuitry of the
switches.
FIGURE 2–10: Switch Input Circuit
EXTERNAL
SWITCH
OPTO
ISOLATION
TYPICAL
SWITCH
TERMINALS
ISOLATED
POWER
SUPPLY
+24VDC
PQM II
TO LOGIC
10mA
PULSED
FILTER IN
COM