ABB eVM1 Installation And Service Instructions Manual page 54

Note
52
Closing Allowed: ticked by default. CB closing is allowed after UV opening operation even if UV
condition is detected. It is used for particular applications, like supervision of the Supply Voltage
of a MV motor via a VT, where the CB powers the motor).
UnderVoltage condition/Function select
Reset/Enabled or Detected/Disabled
Detected/Enabled, Close block enabled (by CoT)
Detected/Enabled, Close block disabled (by CoT)
In both cases (Close block enabled or disabled) during UnderVoltage timing, opening commands
via control panel pushbuttons or external inputs will be performed normally.
If the UnderVoltage Close block is disabled (Closing Allowed is enabled) and the voltage on the
relative external UV input is absent, the CB can be closed; the function timing will start again when
microprocessor reads the CB closed position.
If the ANSI Re-close function is activated during UnderVoltage timing, the CB will not be re-closed,
but only opened.
In general when a protection function (overcurrent, ...) is enabled, and the fault condition is detected,
it is not possible to disable or change the function setting until the fault condition is cleared. The UV
function also allows the disabling of the function by CoT when an UV condition is detected.
14.5.5.7.2 HW configuration
The UnderVoltage function nominal voltage value is selected by setting Dip-Switches I1 (S1...S4)
on the I/O board.
The figure below shows the voltage range selectable, by default the 100Vac – 127Vdc range is
selected.
Dip Switches I1 on I/O board
S1-off
S1-off
S1-off
S1-on
S1-on
S1-off
CB position Open
Closing allowed
CB blocked in open position
Closing allowed
S2-off S3-off S4-off
S3-on S4-on
S2-off
S2-on S3-on S4-on
S2-on S3-on S4-on
S2-on S3-on S4-on
S2-off S3-off S4-off
Closed
Opening allowed
Automatic opening performed
Automatic opening performed
Threshold
220...240 Vac/dc
100...127 Vac/dc
48...60 Vac/dc
24...30 Vac/dc
all others configuration
are not used