ABB SPAM 150 C, Техническая информация

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7
The possibility to use an external trip is also
indicated in the block diagram in Fig. 2. By set-
ting switch SGB/5 = 1, the control input is
linked to the trip output. In this case e.g. an
undervoltage relay can be used to supervise the
busbar voltage and will in a fault condition per-
form a trip using the SPAM 150 as an inter-
face. In this way all signals, events and memo-
rized parameters can be accessed via this relay.
The earth-fault unit is energized from a core
balance CT in order to obtain a sensitive earth-
fault protection. Because of the low input im-
pedance of the relay a low turns ratio of the core
balance c. t. can be used . When using the core
balance c.t. type KOLMA 06 A1, a turns ratio
of 100 /1 A is recommended.
The high-set overcurrent unit constitutes an
interwinding short-circuit protection for the
motor and a phase-to-phase short-circuit pro-
tection for the feeder cable. The current setting
is automatically doubled during start-up. Thus
the current setting can be given a value lower
than the motor starting current. Normally the
setting can be chosen to 0.75 times the motor
starting current. With a suitable operating time
set, this feature will enable the high-set over-
current unit to operate, if the motor is jammed
while the motor is running.
Figure 2. A circuit-breaker controlled drive in an isolated net with core balance approach for the
earth-fault protection.
L1
L2 L3
Uaux
Internal Relay Fault
+ -
0
-
I
-
I
0
+
Motor Restart Enable
Startup Information from Motor
Thermal Prior Alarm
Trip Output Relay
Undervoltage trip, e.g. from a SPAU 121 C to External Control Input
63
62
61
1 A
5 A
1 A
5 A
1 A
5 A
25
26
27
12
3
4
5
6
78
9
1 A
5 A
70
71
72
Rx Tx
65
66
IRF
68
69
77
78
74
75
80
81
10
11
1
1
SGB/1
SGB/2
U1/SGB/7 U1/SGB/8
SGB/3
TRIP
R
SEAL-IN
Σ
>
ts
1
+
B
+
C
+
F
+
E
+
D
+
A
3
SGB/4
STALL
I/O
I»
Io>
I<
START
∆
I
I t
2
RESTART INHIBIT
RESTART INHIBIT
SGB/5
RELAY RESET
θ>θ
i
θ>θ
a
θ>θ
t
SGB/6
EXTERNAL TRIP
U1 SPCJ 4D34
U3 SPTK 4E3
U2 SPTU _ R2
s
s
BLOCK DIAGRAM WITH FACTORY SETTINGS OF SWITCHES SGR
SPAM 150 C
Note! SGB/ 5 =1