Cooper Kyle Form 4C - Page 41

41
S280-77-4
!
SAFETY
FOR LIFE
Modifications
In order to further enhance control flexibility and to offer an
almost unlimited number of time–current curve selections,
each TCC programmed into the Form 4C control can be
modified vertically with a constant time adder (Access Codes
102 or 112), a multiplier value (Access Codes 103 or 113), or
a minimum response time adder (Access Codes 104 or 114).
By simple programming, the basic TCC shape can be
designed to meet coordination requirements. Modified TCC’s
display a c prefix code when interrogated to let the operator
know that the standard TCC is modified. The figures below
provide examples of modification to the basic #133 curve.
Constant Time Adders
Constant time adders can be used to modify TCC characteris-
tics. Programmable constant time adders are available from 0
to 0.2 seconds in 0.01 second increments. Refer to Access
Codes 102 and 112 for interrogation and programming.
Vertical Translation Multiplier
Each phase and ground TCC can be shifted vertically using
vertical multipliers. The available multipliers are 0.10 to 2.0 in
increments of 0.01. Refer to Access Code 103 and 113 for
interrogation and programming.
Time–Current Curve Modifiers (cont’d)
30
20
10
8
6
5
4
3
2
1
.8
.6
.5
.4
.3
.2
0.1
.08
.06
.01
.02
.03
.04
.05
50
60
80
100 200 300 400
500 600
800
1000 2000 3000
4000
5000 6000 8000
10000
20000
30000 40000
50000
CURRENT (percent of minimum trip)
TIME (sec)
TIME [cycles (60 Hz basis)]
0.6
1.2
1.8
2.4
3.0
3.6
4.8
6.0
12
18
24
30
36
48
60
120
180
240
300
360
480
600
1200
1800
x .10
133
x 2.0
30
20
10
8
6
5
4
3
2
1
.8
.6
.5
.4
.3
.2
0.1
.08
.06
.01
.02
.03
.04
.05
50
60
80
100 200 300 400
500 600
800
1000 2000 3000
4000
5000 6000 8000
10000
20000
30000 40000
50000
CURRENT (percent of minimum trip)
TIME (sec)
TIME [cycles (60 Hz basis)]
0.6
1.2
1.8
2.4
3.0
3.6
4.8
6.0
12
18
24
30
36
48
60
120
180
240
300
360
480
600
1200
1800
+ .05 sec
+ .10 sec
+ .15 sec
+ .20 sec
133
30
20
10
8
6
5
4
3
2
1
.8
.6
.5
.4
.3
.2
0.1
.08
.06
.01
.02
.03
.04
.05
50
60
80
100 200 300 400
500 600
800
1000 2000 3000
4000
5000 6000 8000
10000
20000
30000 40000
50000
CURRENT (percent of minimum trip)
TIME (sec)
TIME [cycles (60 Hz basis)]
0.6
1.2
1.8
2.4
3.0
3.6
4.8
6.0
12
18
24
30
36
48
60
120
180
240
300
360
480
600
1200
1800
133
Figure 10.
Basic No. 133 Time–Current Curve
(Control Response Time).
Figure 12.
TCC modification with Vertical Translation Multipli-
er (Control Response Time).
Figure 11.
TCC modification with Constant Time Adder (Con-
trol Response Time).