O & M Manual – Insulated Case ATS Rev: October 2020
Publication Number:
MN0100700E
Version: V10.01.20
Page 75
8.11.
Peak Shave – PS (Standard)
This option provides an input to the transfer switch, which will initiate a transfer of the load to
source S2. Should source S2 fail, or fail to start, the switch will return to source S1. This is
typically used in conjunction with peak shaving Lake Shore Electric Paralleling Switchgear. The
input is a two-wire connection. See unit specific drawings for connection detail.
8.12.
Manual Return to Normal – MRTN – (Standard)
This option eliminates the “S2 Return Delay” timer. By pressing the S1 push button on the
LSE8600 HMI display, it will bypass this timer and being the return to source S1 immediately.
8.13.
Closed Transition Transfer – CTT (Optional)
This option provides for a closed transition (make before break) transfer from normal to
emergency when both sources are available and a closed transition transfer from emergency to
normal to complete the transfer cycle.
Included with this option is a timer “Check Sync” timer. This timer when timing will be displayed
on the HMI LCD as shown here.
Table 32 – Check Sync Transfer Timer
Engine Start
XX:XX Time
Check Sync
XX:XX Time
The closed transition with
Check Sync
functionality allows for both load switching devices to be
closed, and thus both supplies in parallel, for the preconfigured
Parallel Time
. As soon as the
LSE8600 detects the load switching device of the supply the load is being transferred to has
closed, the
Parallel Time
timer begins. Once this timer has expired, the LSE8600 opens the load
switching device of the supply the load has been transferred from. If at any time during this process
a load switching device is detected to have not opened or closed as instructed, one or multiple
alarms are generated. At this point the LSE8600 configures the load switching devices to ensure
continued supply of the site load where possible. Following such instances, load switch alarms
may be cleared without putting the LSE8600 into
Stop
mode by pressing and holding the
Mute
button on the front of the module for 5 seconds. Doing so only resets these alarms, leaving
any other latched or active alarms still present. Pressing the
Stop
button when in
Stop
mode
also clears the load switch alarms, along with any others present.
As a safeguard, the Closed Transition Transfer Option provides a reverse power relay for each
source. If both sources might be left in the closed position due to some form of a malfunction, the
reverse power relays will sense a reverse power flow condition, if present, and trip/cross trip both
sources. One or multiple alarms are generated, and individual reverse power, form “C” relay
contacts, will changed state to indicate system trouble.