36
VM1
- USER MANUAL
—
8. Circuit breaker characteristics
8.5.2. Circuit breaker auxiliary contacts
It is possible to have electrical signalling of circuit
breaker open/closed by means of make and break
contacts. The following configurations are
available.
For Fixed circuit breaker (-BB1; -BB2; -BB3; -BB8)
2A Set of 5 make contacts plus 5 break contacts
2B Set of 10 make contacts plus 10 break contacts
For withdrawable circuit breaker (-BB1; -BB2)
2C Set of 5 break contacts plus 5 make contacts.
Characteristics
Un:
24 ... 250 V a.c.-d.c.
Rated current:
Ith
2
= 10 A
Insulation voltage:
2500 V 50 Hz (for 1 min)
Electrical resistance:
3 mOhm
Rated current and breaking capacity
in category AC11 and DC11:
Un
Cos
ϕ
T
In
Icu
220 V ~
0.7
--
2.5 A
25 A
24 V –
--
15 ms
10 A
12 A
60 V –
--
15 ms
6 A
8 A
110 V –
--
15 ms
4 A
5 A
220 V –
--
15 ms
1 A
2 A
3) The functions carried out by the control
module are:
•
auto-trip following detection of wrong circuit
breaker state after an operation attempt
•
auto-trip following lower capacitor charging
threshold than the minimum value required for
the opening and closing operation
•
anti-pumping relay function
•
priority opening function in the case of
opening and closing commands being sent at
the same time (TRIP-FREE)
•
checking the capacitor load voltage with auto-
shutdown of the feeder when the maximum
charging level is exceeded
•
opening for undervoltage. The rated voltage is
set (values foreseen: 24-30 V AC, 48-60 V DC,
100-127 V AC/V DC 220-240 V AC/V DC) and
opening can also be delayed (trip delays
foreseen: 0-0.5-1-2-3-4-5 sec). The “lock in
open” (the closing command is only accepted
after the opening function for undervoltage
has been reset) and “reclosing enabled” (the
closing command is accepted even if the
opening function for undervoltage is still
active) can also be selected (-SO4)
•
watchdog of the electronic power circuit with
feeder auto-shutdown in the case of
overtemperature and/or overcurrent
•
slow capacitor charging function (the charging
power passes from 100 watt to 40 watt,
doubling the charging time. This function is
useful when self-supply by means of a voltage
transformer is to be made)
•
monitoring continuity of the opening and
closing coils
•
management of opening attempts: after 10
unsuccessful opening attempts the control
electronics block and the DR and EN signalling
contacts are activated to indicate that the
circuit breaker is not ready for the operation
•
reclosing function according to the ANSI
standards (ANSI RECLOSE)
•
watchdog (DN)
•
limitation of the feeder connection current
•
serial RS232 for local connection (only to be
used by ABB personnel).
N.B. Some of the control module functions can be excluded/set by means
of special dip-switches on the card. Changing the dip-switch settings
must always be carried out with the control module de-energised and
capacitor/s discharged, both for safety of personnel and because the
adjustments set are only detected by the control electronics when it is
turned on.
Summary of Contents for VM1
Page 59: ...MEDIUM VOLTAGE PRODUCTS 59 59 ...
