ABB V-Contact VSC Series Installation And Service Instructions Manual page 23

TABLE 1
Version
SCO (Single Command
Operated)
DCO (Double Command
Operated)
TABLE 2a
SCO version (Single Command Operated)
Closing operation.
Voluntary opening operation.
Automatic opening operation (2).
TABLE 2b
DCO version (Double Command Operated)
Closing operation.
Voluntary opening operation.
Operazione di apertura automatica (2).
(1) The opening operation can be instantaneous or delayed (adjusting the delay by means of the special selectors) by 0.5 - 1 - 2 - 3 - 4 - 5 s. It is adjusted to 0 s as
the default.
(2) The contactor is fitted with watchdog function which makes it open automatically if the capacitor charge drops below the ultimate safety limit.
It is possible to preset the opening delay with
the group of selectors S1 ... S3 both in the SCO
version and, when the undervoltage accessory
is provided, in the DCO version.
(*) DCO = undervoltage disabled.
Fig. 9
Description
With this version the closing operation takes place by
supplying auxiliary energy to the UV (undervoltage) input
of the apparatus. On the other hand, the opening operation
takes place when the auxiliary energy is either voluntarily
cut off (by means of an auxiliary command) or involuntarily
(due to no auxiliary energy in the installation) at the UV
(undervoltage) input of the contactor.
With this version, the closing operation takes place by
supplying the input of the closing command of the
apparatus in an impulsive way. On the other hand, the
opening operation takes place when the input of the
opening command of the contactor is supplied in an
impulsive way.
• Power supply, continuously, at the UV input
• Power supply cut at the UV input (
• Drop in the auxiliary voltage supplied at the UV input (1) below the trip
old prescribed by the Standards.
• Power supply, in an impulsive way, of the closing input (30 ms minimum impulse
• Power supply, in an impulsive way, of the opening input (30 ms minimum impulse
• Function available on request (UV – undervoltage)
• Drop in the auxiliary voltage supplied at the UV input (1) (undervoltage) below the
time)
time). If the closing command persists at the same time, the contactor opens since
the opening command has priority. In this situation the contactor remains in the open
position due to the integrated anti-pumping function (until the opening command
ceases).
trip threshold prescribed by the Standards.
Selector Delay
SCO = 0 s
DCO = (*)
S1-off S2-off S3-off
S3-on
S1-off S2-off
S2-on
S1-off S3-off
S2-on S3-on
S1-off
Inputs
Closing Opening
KM1-7, KM1-8 KM1-9, KM1-10
Not used Not used
Used Used
1 )
Selector
S1-on
S2-off
S1-on
0 s
S2-off
S1-on S2-on
0,5 s
S1-on S2-on
1 s
UV (undervoltage)
KM1-11, KM1-12
Used
Usedif the
undervoltage
function is
requested.
thresh-
Delay
2 s
S3-off
S3-on
3 s
4 s
S3-off
S3-on
5 s
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