Dale Power Solutions Ltd
Salter Road, Eastfield Industrial Estate, Scarborough, North Yorkshire, YO11 3DU, UK
info@dalepowersolutions.com | www.dalepowersolutions.com |
+44 (0) 1723 583511
Operation
Working modes
The UPS has the following modes of operation:
■ On-line mode
■ Battery mode
■ Auto-restart mode
■ Bypass mode
■ ECO mode
■ Frequency converter 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 inverter when the a.c. input and
load are within their normal ranges. The battery is trickle charged in this mode.
During fault conditions the UPS automatically switches to either bypass mode or battery mode without
interruption of power to the load.
Battery mode
In battery mode the load is supplied from the battery via the inverter, the UPS beeps every 3 s, and the
rectifier 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 Mains LED if off and the Battery LED is on.
When the battery reaches a pre-set 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. If
you turn off the UPS in battery mode it restarts in bypass mode and you must press the INVERTER ON
button to start the inverter.
Auto-restart mode
Following an extended a.c. mains failure the battery will become exhausted. When the battery reaches
the end of discharge (EOD) voltage the inverter shuts down and no more power is supplied to the load.
By default the UPS remains shut down after EOD. However it can be programmed to automatically restart
after a time delay. This is normally done by the commissioning engineer.
Bypass mode
In bypass mode the load is supplied directly from the a.c. mains 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 inverter is turned off.
