TS_604_01 PowerWave PW3000/TP User Manual UK 5/1/18
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2: General Description
2.3.4 Optional operating mode settings
The above descriptions refer to the UPS operation in what can be considered to be a ‘standard’ installation. However, the
operation can be modified to suit local conditions, or particular load supply requirements, by adjusting the selected values
in the LCD
SETTINGS
sub-menu, as shown in Figure 2.17.
Note:
These settings are password-protected and can only be changed by authorised service personnel.
Auto Restart
If the input mains supply fails, and no bypass mains supply is available, the UPS will operate on-battery and shut down
when the battery reaches its end of discharge voltage, or immediately if the battery is disconnected. The
Auto restart
setting determines whether or not the UPS restarts automatically following the return of the input mains.
The default value for
Auto restart
is [
Enabled
]. This means that if the UPS shuts down following a mains failure it will
restart automatically and return the load to the inverter when the mains supply returns. If
Auto restart
is [
Disabled
]
the UPS will have to be restarted manually.
Note:
If the UPS shuts down due to an overload, an automatic restart can be [
Enabled
] or [
Disabled
] by setting the
separate
Automatic overload restart
parameter.
Auto Bypass
In a ‘standard’ installation the load will be transferred to the bypass supply (if available) if the inverter shuts down due to an
overload, inverter fault or a fully discharged battery when operating on battery power. However, in areas where the mains
supply is unstable the automatic transfer to bypass function can be inhibited by setting the
Auto bypass
to [
Disabled
].
Note:
If
Auto bypass
is [
Disabled
] the UPS will shut down (and drop the load) when it is operating on battery power
and the battery reaches its end of discharge voltage.
Short Circuit Clearance
This parameter determines how the UPS reacts to a short circuit on its output.
If a short circuit is detected the inverter will limit its output current to 100% by reducing its output voltage – once the short
circuit is cleared the output current will fall below 100% and the output voltage will return to normal.
By default the
Short circuit clearance
is set to [
Disabled
], and in this case the inverter will continue to supply
100% load for 100 ms. After this time the UPS is shut down if its output voltage is still <50%
If
Short circuit clearance
is [
Enabled
], the inverter short circuit clearance time is extended to 4 seconds.
2.3.5 Multi-module parallel system operation
To expand the overall UPS system rating, up to four PowerWave PW3000/TP UPS cabinets can be connected together to
operate as a parallel UPS system. This is achieved by connecting each cabinet’s output power terminals in parallel at an
external load distribution panel and linking together the parallel control bus in each cabinet to effectively provide a
common parallel control bus. The parallel control bus cable is connected to a socket located near the top rear of the
cabinet which is covered by a blanking plate when not used (item 12 in Figure 2.7).
It is essential that any installed UPS power protection system can be expanded to meet a growing load demand without
compromising the existing load supply. This situation is easily managed by a PowerWave PW3000/TP system which
makes it possible to add a further cabinet to an existing UPS system without disrupting the load supply.
Note:
Every PowerWave PW3000/TP cabinet is supplied with all the features required for parallel operation to eliminate
any need for time-consuming or expensive upgrading on site.
WARNING:
This mode is recommended only if the connected load equipment can tolerate a power
interruption of up to 3 to 5 ms during the transfer period.
The ‘on-line’ mode must always be used for critical load protection.
