Woodward
Manual MRM3-2 GB
46
TD_MRM3-2_09.08_GB_Rev.New
7.3.2 Time over current protection
Parameter
LED Setting range Notes
Range
Step Tolerance
Therm. Permissi-
ble contin. current
k x I
B
I
B
0.20...4.00
EXIT
x I
N
Step switched
off
0.01;
0.02;
0.05;
0.1 x I
N
±
3% of setting
value
or
±
10mA
Overload factor
k
0.80...1.20
0.01
As warning or
tripping step
I
B
>+
τ
W
warn
trip
Step signals
warning
Step signals
tripping
Excitation delay
for I
B
>*k
I
B
>+t> 0,1...260
0.04-1.00
1.00-2.00
2.00-5.00
5.00-8.00
8.00-10.0
10.0-20.0
20.0-50.0
50.0-100
100-200
200-260
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
10.0
20.0
±
3% of setting
value or
±
25ms
Heating time con-
stant
τ
W
0.5...180
min
0.5-2.0
2.0-5.0
5.0-10
10-20
20-50
50-100
100-180
0.1
0.2
0.5
1.0
2.0
5.0
10.
±
3% referring to
current measur-
ing value
or
±
30ms
(See EN 60255-
3)
Time limit
τ
W
Start
t2x
t6x
EXIT
ab 2 x k*I
B
ab 6 x k*I
B
no limitation
Cooling down fac-
tor
τ
C
1.00...8.00
x
τ
W
1.00-2.00
2.00-5.00
5.00-8.00
0.05
0.1
0.2
±
3% referring to
measuring value
or
±
30ms
(See EN 60255-
3)
Warn step ther.
image
ϑ
>
20...99
EXIT
Warning at %
ϑ
>
Step switched
off
20-99 1
±
1% of the set-
ting value
Undercurrent I< 0.10...1.00
EXIT
Trip delay x I
N
Step switched
off
0.100-0.200
0.200-0.500
0.500-1.00
0.005
0.01
0.02
±
3% of the set-
ting value or
±
10mA
I<+t>
0,1...260
EXIT
Trip delay in s
Warning only
0.04-1.00
1.00-2.00
2.00-5.00
5.00-8.00
8.00-10,0
10.0-20,0
20.0-50,0
50.0-100
100-200
200-260
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
10.0
20.0
±
3% of the set-
ting value or
±
25ms
Over current
I>
0.2...4.0
EXIT
Pick-up value x
I
N
Step switched
off
0.20-0.50
0.50-1.00
1.00-2.00
2.00-4.00
0.01
0.02
0.05
0.1
±
3% of the set-
ting value or
±
10mA
Characteristics I>+CH
AR
DEFT
NINV
definite
normal inverse
