GE 369, Быстрый старт

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4–50 369 MOTOR MANAGEMENT RELAY – QUICKSTART GUIDE
S9 DIGITAL INPUTS CHAPTER 4: KEYPAD SETPOINTS
4.7.2 Spare Switch
PATH: S9 DIGITAL INPUTS
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SPARE SWITCH
See Section 4.7.1: Digital Input Functions on page –48 for an explanation of the spare
switch functions.
In addition to regular selections, the Spare Switch may be used as a starter status contact
input. An auxiliary ‘52a’ type contact follows the state of the main contactor or breaker
and an auxiliary ‘52b’ type contact is in the opposite state. This feature is recommended
for use on all motors. It is essential for proper operation of start inhibits (i.e., starts/hour,
time between starts, start inhibit, restart block, backspin start inhibit), especially when the
motor may be run lightly or unloaded.
A motor stop condition is detected when the current falls below 5% of CT. When SPARE
SWITCH
is programmed as
“Starter Status”
, motor stop conditions are detected when the
current falls below 5% of CT and the breaker is open. Enabling the Starter Status and
wiring the breaker contactor to the Spare Switch eliminates nuisance lockouts initiated by
the 369 if the motor (synchronous or induction) is running unloaded or idling, and if the
STARTS/HOUR
,
TIME BETWEEN STARTS
,
START INHIBIT
,
RESTART BLOCK
, and
BACKSPIN
START INHIBIT are programmed.
In addition, there may be applications where current is briefly present after the breaker is
opened on a motor stop (for example, discharge from power factor correction capacitors).
In such a case, the 369 will detect this current as an additional start. To prevent this from
occurring, the
STARTER OPERATION MONITOR DELAY
setpoint is used. If this setpoint is
programmed to any value other than “OFF”, a motor start is logged only if current above
5% of the CT is present
and the breaker is closed (for an “52a” type contact). If the breaker
is open (for an “52a” type contact) and the current above 5% of CT is present for longer
than the
STARTER OPERATION MONITOR DELAY
time, then a trip or alarm will occur
(according to the relay settings). If the trip relay is assigned under the ASSIGN RELAYS
setpoint, then a trip will occur and a trip event will be recorded; otherwise, an alarm will
occur and an alarm event recorded. If the
STARTER OPERATION MONITOR DELAY is “OFF”,
this functionality will be disabled.
Note
The Access switch is predefined and is non programmable.
SPARE SWITCH SPARE SW FUNCTION:
Off
Range: Off, Starter Status, General, Digital Counter,
Waveform Capture, DeviceNet Control
MESSAGE
STARTER AUX CONTACT
TYPE: 52a
Range: 52a, 52b
Only seen if FUNCTION is "Starter Status"
MESSAGE
STARTER OPERATION
MONITOR DELAY: 3 s
Range: OFF, 0 to 60 s in steps of 1
Only seen if FUNCTION is “Starter Status”
MESSAGE
STARTER OPERATION
TYPE: Off
Range: Off, Latched, Unlatched. Only seen if
SPARE
SW FUNCTION
is “Starter Status” and
STARTER OPERATION MONITOR DELAY is
MESSAGE
ASSIGN RELAYS:
None
Range: None, Trip, Alarm, Aux1, Aux2, or combinations.
Only seen if
SPARE SW FUNCTION
is “Starter
Status” and
STARTER OPERATION
MONITOR DELAY is not “Off”.