O & M Manual – Insulated Case ATS Rev: October 2020
Publication Number:
MN0100700E
Version: V10.01.20
Page 35
4.2.
Operational Configuration
The LSE8600 controls the operation of the automatic transfer switch and contains as standard
features, four modes of operation, up to 9 timers with additional fixed PLC timers determined by
system requirements, a plant exerciser scheduler, and various sets of dry contacts for the
customers’ use. (Typical Contacts: Switch Position, Source Available, Engine Start, Elevator
Control and System Alarm)
4.2.1.
Modes of Operation (Utility to Generator)
There are five modes of operation. All may be accessed from the HMI Panel.
1.
Automatic
2.
Manual
3.
Load Test
4.
Off / Reset
5.
Alarm
a.
Electrical Trip
b.
S1 / S2 Failed to Open
c.
S1 / S2 Failed to Close
d.
S1 / S2 Closed Simultaneously (Not Physically Possible when Mechanical
Interlock is Installed. However, the controller inputs may have experienced a fault
if this fault is seen.)
e.
Warnings – Non-Critical Alarm Conditions
The fifth mode is not selectable. In the LSE8600 controller, an "Electrical Trip" alarm indicates
an electrical fault has occurred on the system and has locked out the LSE8600 from performing
any other functions until what caused the fault has been cleared.
Any alarms that may occur during normal operation of the ATS will appear on the Alarms menu.
4.2.2.
Electrical Trips
Electrical trips are "latching unload" and stop S2 (if configured as a generator) but in a
controlled manner. On initiation of the electrical trip condition the module de-energizes the
"Close S2 Output"
to remove the load from S2. Once this has occurred the module starts
the Cooling timer and allow the generator to cool down and shut off. The alarm must be
accepted and cleared, and the fault removed to reset the module; possible power cycle may
be required to complete clear the fault in the LSE8600.
Table 13 - Electrical Trip Example
1/2 Alarm
"ES" Breaker Tripped
Latched
Electrical Trip
