DUO II / DUO II Pro series UPS – Instruction Manual
2010/03/19
www.ever.eu
9
SAFEGUARDS
Against overloads
The overload protection circuit indicates an overload in the mains operation mode at loads
exceeding 110% of nominal power with a constantly lit up red LED and a continuous sound
signal (DUO II 350/500) or with a flashing red LED and an intermittent sound signal (DUO II
800/1000). If this condition is maintained for a longer period of time, the UPS will switch off
automatically. The greater the overload, the faster the UPS will switch off. Excessive loads
while in battery operation mode will lead to the UPS switching off.
Against shorting
Protection against shorting on the input side is provided by a circuit breaker. Additionally, the
output of the UPS in battery operation mode is protected by an electronic safeguard whose
triggering is indicated by constant light of the red LED and a continuous acoustic signal. If
the shorting at the UPSs output persists for longer that 0.5 seconds while in battery
operation mode, voltage is disconnected from outlet sockets while the UPS remains in the
signalling mode. The battery has to be turned back on manually by the user.
Against overloads
In mains operation mode with loads exceeding 110% of nominal power the battery back-up
indicated the overload status with a quick intermittent sound signal (twice a second). If this
condition persists the battery back-up will switch off automatically. The greater the overload,
the faster the back-up will switch off. In battery operation mode excessive load causes the
battery back-up to switch off.
Summary of Contents for Duo II 1000
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