30
5.7. Description of the closing and
opening operations
The contactor drive operates in two different ways as shown
in Table 1.
For the DCO version, further personalisation of the apparatus
can be made. In fact – the first of its kind – the V-Contact
VSC contactor is fitted (on request) with an undervoltage
function (UV) with delays which can be set according to the
requirements of the installation.
For a more detailed description of the behaviour of the
apparatus according to the version, see table 2.
Supply the contactor with auxiliary voltage and operate it several
times electrically. The contactor must carry out the opening and
closing operations correctly in accordance with the threshold
values defined in the IEC 62271-106 Standards.
TABLE 1
Version
Description
Inputs
Closing
-XDB10-7, -XDB10-8
Opening
-XDB10-9, -XDB10-10
Undervoltage
-XDB10-11, -XDB10-12
SCO
(Single Command
Operated)
This version operates according to the state of the
command signal at terminals -XDB10-11 and -XDB10-12.
Contactor closing takes place when the voltage applied
to terminals -XDB10-11 and -XDB10-12 corresponds with
the values indicated in Table 2a
Not used
Not used
Used
DCO (
1
)
(Double Command
Operated)
This version operates by means of two independent signals
for closing and opening applied to terminals -XDB10-7 and
-XDB10-8 for opening and -XDB10-9 and -XDB10-10 for
closing. The values of the signals are indicated in Table 2b.
Furthermore, on request, automatic delayed opening of the
contactor is available in the case of a drop or lack of voltage at
terminals -XDB10-11 and -XDB10-12 (configurable delay filter).
See Table 2b.
Used
Used
If the undervoltage
function
is required (
2
)
(1)
The contactor is restarted if the supply voltage of the board drops below 18V for more than 300ms.
(2)
The undervoltage with time-delay function is guaranteed with 18V minimum residual voltage.
TABLE 2a
SCO (Single Command Operated) version
Terminals -XDB10-1 and -XDB10-2 must always be supplied at the rated voltage (tolerance: 85% … 110%)
Closing operation
Power supply, in continuous mode, to the UV input
Opening
operation
(
3
)
Release voltage
(drop out)
A voltage drop occurs at terminals -XDB10-11 and -XDB10-12 for power supply voltage values between
75% and 10% of the rated voltage.
TABLE 2b
DCO (Double Command Operated) version
Terminals -XDB10-1 and -XDB10-2 must always be supplied at the rated voltage (tolerance: 85% … 110%)
Closing operation
Supply terminals -XDB10-7 and -XDB10-8 with power. An impulse lasting at least 100 ms is
recommended. Note: an impulse lasting a shorter time may also cause contactor closing.
Opening
operation
Opening operation
(switching)
Supply terminals -XDB10-9 and -XDB10-10 with power. An impulse lasting at least 100 ms is
recommended.
Note: an impulse lasting a shorter time may also cause contactor closing. In the case of simultaneous
power supply of terminals -XDB10-7 and -XDB10-8 and terminals -XDB10-9 and -XDB10-10, the opening
command prevails.
Release voltage
(undervoltage)
– Function available on request (UV = Undervoltage).
– Opening takes place for voltage values applied to terminals -XDB10-11 and -XDB10-12, between 70%
and 35% of the rated voltage (
4
)
(3) The opening operation is only instantaneous.
(4) The opening operation can be instantaneous or delayed (adjusting the daily by means of the special selectors) a 0.3 - 1 - 2 - 3 - 4 - 5 s. It is set to 0 s by default.
Setting for DCO
UV time (s)
S1-3
S1-4
S1-5
Instantaneous
(
1
)
0
0
0
0.3s
0
0
1
1s
0
1
0
2s
0
1
1
3s
1
0
0
4s
1
0
1
5s
1
1
1
S1-6
Reserved – (1) See opening time par. 1.3.
NEPSI.COM - Northeast Power Systems. Inc.
