Output Relays - GE 469 Instruction Manual

2 INSTALLATION
Relay contacts must be considered unsafe to touch when the 469 is energized! If the output relay contacts
are required for low voltage accessible applications, it is the customer's responsibility to ensure proper
WARNING
insulation levels.
There are six (6) Form-C output relays (see Section 1.2: Specifications on page 1–4 for details). Five of the six relays are
always non-failsafe; R6 Service is always failsafe. As failsafe, the R6 relay is normally energized and de-energizes when
called upon to operate. It also de-energizes when 469 control power is lost and will be in its operated state. All other relays,
being non-failsafe, will normally be de-energized and energize when called upon to operate. When the 469 control power is
lost, these relays are de-energized and in their non-operated state. Shorting bars in the drawout case ensure that no trip or
alarm occurs when the 469 is drawn out. However, the R6 Service output will indicate that the 469 has been drawn out.
Each output relay has an LED indicator on the front panel that turns on when the associated relay is in the operated state.
• R1 TRIP: The trip relay should be wired to take the motor off line when conditions warrant. For a breaker application,
the NO R1 Trip contact should be wired in series with the Breaker trip coil. For contactor applications, the NC R1 Trip
contact should be wired in series with the contactor coil.
Supervision of a breaker trip coil requires that the supervision circuit be in parallel with the R1 TRIP relay output con-
tacts. With this connection made, the supervision input circuits place an impedance across the contacts that draws a
2 mA current (for an external supply voltage from 30 to 250 V DC) through the breaker trip coil. The supervision circuits
respond to a loss of this trickle current as a failure condition. Circuit breakers equipped with standard control circuits
have a breaker auxiliary contact permitting the trip coil to be energized only when the breaker is closed. When these
contacts are open, as detected by the Starter Status Digital Input monitoring breaker auxiliary contacts, trip coil super-
vision circuit is automatically disabled. This logic allows the trip circuit to be monitored only when the breaker is closed.
• R2 AUXILIARY, R3 AUXILIARY: The auxiliary relays may be programmed for trip echo, alarm echo, trip backup,
alarm differentiation, control circuitry, and numerous other functions. They should be wired as configuration warrants.
• R4 ALARM: The alarm relay should connect to the appropriate annunciator or monitoring device.
• R5 BLOCK START: This relay should be wired in series with the start pushbutton in either a breaker or contactor con-
figuration to prevent motor starting. When a trip has not been reset on a breaker, the block start relay prevents a start
attempt that would result in an immediate trip. Any lockout functions are also directed to the block start relay.
• R6 SERVICE: The service relay operates if any of the 469 diagnostics detect an internal failure or on loss of control
power. This output may be monitored with an annunciator, PLC or DCS. If it is deemed that a motor is more important
than a process, the service relay NC contact may also be wired in parallel with the trip relay on a breaker application or
the NO contact may be wired in series with the trip relay on a contactor application. This will provide failsafe operation
of the motor; that is, the motor will be tripped off line in the event that the 469 is not protecting it. If however, the pro-
cess is critical, annunciation of such a failure will allow the operator or the operation computer to either continue, or do
a sequenced shutdown. See the following figure for details.
GE Multilin
Courtesy of NationalSwitchgear.com
Figure 2–22: ALTERNATE WIRING FOR CONTACTORS
469 Motor Management Relay
2.2 ELECTRICAL

2.2.9 OUTPUT RELAYS

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