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5: Parallel UPS System Operating Procedures
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UPS725-02-02 PowerWave 1000 (4.5 - 10 kVA) User Manual UK Dated 13/03/15
5.2 Shutdown procedure
This procedure assumes that the UPS system is to be totally shut down from a fully ‘ On-line ’ condition and no external
(maintenance) bypass facility is connected.
1. Turn off the load by opening the external load isolators or switching off the
individual load items.
2. On each UPS module in turn, press the OFF button for approximately 3~5
seconds, until you hear two beeps, then release it.
a) The input mains and bypass supply leds will remain lit.
b) The LCD screen will show the UPS status as
oFF
.
c) On the LCD mimic, the load will be shown disconnected from the UPS
but the battery still connected to the input LINE and on charge (top
illustration).
d) Continue switching OFF the other modules.
e) When ALL the modules have been turned OFF they will simultaneously
switch to the ‘ On-bypass ’ mode and the LCD will be as shown in the
lower illustration.
3. To completely shut down the UPS:
a) Turn OFF the UPS utility supply (and bypass supply if separate).
b) Open the input circuit breaker(s) located on the back of the UPS.
c) Open the battery isolator on the back of the battery enclosure.
4. The UPS fans and control panel will remain operative for a few seconds
before the unit completely shuts down.
5.3 Manual load transfer between inverter and bypass
Some installations might include an external (maintenance) bypass circuit connected in parallel with the UPS to provide an
alternative power source for the load supply. Such installations are designed to enable the UPS system to be totally
powered down without disrupting the load – for example, for troubleshooting or repair.
To prevent the external bypass from back-feeding the UPS inverter and causing it damage, the transfer between the UPS
and external bypass is only permitted if the UPS is itself operating on its internal static bypass.
Note: In practice, a variety of external bypass designs are used, so explicit external bypass operating instructions are not
provided here. The following instructions refer only to the UPS internal inverter/bypass transfer operation.
5.3.1 Transferring the load from the UPS inverter to the internal bypass
1. Turn OFF ALL the UPS modules in turn by pressing their OFF button.
2. As the modules are turned off, the load will be transferred to the internal
static bypass line (‘on-bypass’ mode) in ALL modules when the number
modules remaining on line defeats the system’s redundancy (depending
on load).
On ALL modules:
a) The input mains and bypass supply leds will remain illuminated but
the N+1 led will extinguish.
b) The LCD screen will show the UPS status as
oFF
.
c) On the LCD mimic, the load will be shown disconnected from the
UPS but the battery still connected to the input LINE and on charge.
d) All metered parameters can be monitored as per normal.
CAUTION: Before you shut down the UPS system you should first check with the load user that it is
operationally safe to disconnect the critical low power.
LINE UPS LOAD
1 2
EC
O
N+
1
LINE UPS LOAD
1
2
EC
O
N+
1
LINE UPS LOAD
1 2
EC
O
N+
1