Installation, Operation and Service Manual
LKAT Plus EMC
© 2018 DynAmp, LLC
Page 25
047331 A
5.12 “FAILSAFE” / “NON-FAILSAFE” CONFIGURATION
The LKAT Plus System relay outputs are failsafe as factory configured. When the system is
energized, all relay coils are energized and all contacts change state; that is, open contacts
close and closed contacts open. During any alarm condition, relay coils de-energize, which
changes the state of the relay contacts.
In the failsafe configuration, loss of input power to the LKAT Plus Metering Unit de-energizes
the alarm relay coils. This causes the relay contacts to change state and indicate an alarm
condition.
For some applications, the user requires that Trip1 to be “non-failsafe”. That is, the system
should not produce an alarm when there is loss of input power. Alarm conditions other than
loss of input power must continue to result in an alarm. Trip1 relay contacts can be
configured for Non-Failsafe operation. AD relay contacts are failsafe only. Trip2 and Trip3
relay contacts (present on optional PE PCB assembly) are failsafe only.
Table 5.3 shows the status of the LKAT Plus alarm relay contacts. The alarm relay contact
condition is shown as it exists at the customer connections to the Metering Unit.
To convert the LKAT Plus System Trip1 to non-failsafe operation requires modification of the
Main pc board assembly, and modification of an internal wiring harness. Contact factory.
Table 5.3
LKAT Plus
Alarm Relay Status
(As found at Customer Connection to Metering Unit)
Non-Failsafe Metering Unit Configuration
Alarm
Name
Contact Set
POWER
OFF
POWER ON
NORMAL
POWER ON
ALARM
TRIPPED
Trip2
P9-6 to P9-8
Closed
Open
Closed
P9-6 to P9-7
Open
Closed
Open
Trip3
P9-3 to P9-5
Closed
Open
Closed
P9-3 to P9-4
Open
Closed
Open
Trip1
P3-6 to P3-8
Open
Open
Closed
P3-6 to P3-7
Closed
Closed
Open
AD
P3-3 to P3-5
Closed
Open
Closed
P3-3 to P3-4
Open
Closed
Open
