Table 2-1. Sync Acceptor, Controls and Indicators - Continued
Locator
Control or Indicator
Function
9146600990 Rev M
BE1-25A Human-Machine Interface
2-7
H
LOCKOUT LED
This LED lights to indicate the occurrence of a lockout
condition. During lockout, the output of the relay is inhibited
from signaling the breaker to close. Lockout may be cleared
by the front panel RESET switch, by a (continued)remotely
located contact, or by powering down and then powering up.
I
RESET Switch
When momentarily raised, this switch restores the Relay to
operation after a lockout has occurred.
J
SIGnal/COMmon Test Points
Used to monitor the output breaker closure signal during
testing or calibration.
K
GENerator UnderVoltage
LED
An LED that lights when the generator voltage is below an
acceptable range of the synchronizer. Under this
circumstance, the synchronizer is not allowed to close the
breaker. (The acceptable range is defined by the GEN UV
setting of register 5.)
L
SLIP INH LED
An LED that lights when the slip frequency exceeds the
paralleling tolerance established by the MAX SLIP setting.
The breaker close output is inhibited whenever this LED is
ON.
M
SYNC LED
This LED is in parallel with the coil of the sync output relay.
When the sync output relay coil is energized, the LED lights.
ADDITIONAL MODULES
Controls and indicators of the additional plug-in modules for the BE1-25A Relay, are described in the following
paragraphs.
Voltage Acceptance Module A1
Option A1 introduces an additional enabling factor for the breaker closing signal. This additional parameter,
)
V, represents the difference in voltage on the two sides of the circuit breaker. I.e., if
)
V is greater than the
setting established by the VOLTAGE DIFFERENCE control (Figure 2-4), the closure command output of the
BE1-25A unit is inhibited.
Note that the magnitude of the VOLTAGE DIFFERENCE setting is expressed as a percentage of the bus
voltage: the voltage difference (in %) =
*
)
V
*
*100/V
BUS
.
An LED indicator,
)
V HIGH, illuminates when the voltage difference exceeds the setting and the synchronizer
is inhibited.
As will be seen later, this option or option A2 is a prerequisite of, and a controller of, any Voltage Matching
option that may be present.
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