Dale Power Solutions Ltd
User Manual
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11
Operation
Working modes
The UPS has four distinct modes of operation:
■ On-line mode
■ Bypass mode
■ Battery mode
■ ECO mode
Each operating mode is described below.
On-Line mode
This is the default mode of operation in which the load is supplied via the AC/DC converter and inverter
when the a.c. input and load are within their normal ranges. In this mode the green inverter LED is on and
the battery is trickle charged.
During fault conditions the UPS automatically switches to either bypass mode or battery mode without
interruption to the load.
Bypass mode
In bypass mode the load is supplied directly from the a.c. input and the battery is charged. The UPS
switches to bypass mode when any of the following conditions occur:
■ An output overload – the unit beeps twice every second, indicating that the load must be reduced to
within its normal range as soon as possible. Once the overload is removed the inverter re-starts after
a 5 minute delay. If the UPS is overloaded too many times in any one hour it will eventually remain in
bypass mode.
■ The UPS is too hot – the UPS reverts to on-line mode as soon as the unit temperature returns to
normal.
■ The UPS fails – a serious fault has occurred within the UPS that must be repaired.
■ The UPS is turned off.
In bypass mode the inverter LED is off and the amber bypass LED is on.
Battery mode
In battery mode the load is supplied from the battery via the DC/DC converter and inverter, the UPS
beeps every 3 s, and the AC/DC converter and charger are turned off. The UPS switches to battery mode
when there is no a.c. input or the a.c. input is outside its normal range. On the front panel the inverter and
battery LEDs are on.
When the battery reaches a preset low limit, the system gives a low battery voltage alarm signal, the LCD
provides a low battery alarm, and the UPS beeps every second. Eventually the UPS shuts down to
prevent damage to the batteries.
When the a.c. mains is restored the inverter starts automatically and the UPS reverts to on-line mode.
ECO mode
If specified, your UPS may be set to operate in ECO mode instead of on-line mode. In ECO mode the
load is supplied via the bypass circuit and not the AC/DC converter and inverter, allowing the UPS to
work at higher efficiency. The battery is trickle charged in this mode. If the a.c. input is lost or goes
beyond its normal range the UPS automatically switches to battery mode, however, the transfer speed is
slower than on-line mode and may not be suitable for all applications.
Note:
Do not use ECO mode when the mains is of poor quality.
