e.
Open the input breaker
– transformers will de-energize.
f.
Now that all power has been cut off within the ELI system. All LED’s, displays
and fans should be off.
7.3
From Inverter To Manual Bypass Procedure
The following procedures will allow the service personnel to switch the ELI
system to maintenance bypass mode without interrupting the output power to the
loads.
a.
Switch off the inverter
– The inverter can be switched off by simultaneously
pressing the inverter off switch (
O
) and the inverter control switch (
◄►).
The load will be automatically transferred to reserve (utility) supply without
interruption.
b.
Open the battery breaker
– This will disconnect the batteries from the DC
bus and the ELI no longer has back-up available. This is located within the
ELI system or within the battery cabinets.
c.
Open the rectifier breaker
– Opening the rectifier breaker will take the
power source away from the DC bus; therefore, the DC bus will start to
drop slowly. After 5 min., the DC bus will drop to a safe level (approx.
20VDC).
d.
Close the bypass breaker
– The reserve breaker and reserve static switch
are still conducting. When the maintenance bypass breaker is closed,
power will flow through the bypass loop instead of the reserve loop
because the impedance of the bypass loop is lower.
e.
Open the reserve breaker
– You can now open the reserve breaker to cut
off any power within the ELI electronics.
NOTE
: To place the unit into Maintenance Bypass mode the fuse holders behind
the control module (where all control PCB’s are stored) must be opened.
The system is now in Manual Bypass mode (or Maintenance Bypass mode).
27
CAUTION!
If the fuse holders have not been opened, power is still present and fans will be
turning. If the fuse holders are open power is still present at the terminal strip and
several terminals on the PCB’s.
CAUTION!
Terminal strip and breakers may still be energized if the main input breaker feeding
the ELI system is not turned off or open.
M4102 Ty-Borealis 8-48KW Operators Manual v1.0 2013-08-14