Mitsubishi Electric MELPRO-A Series Instruction Manual page 12

R S T
DS
kt
k
K
ZCT
L
ℓ
E
D
ℓt
VT
F
No-voltage
tripping coil
CB
C1R
CT
C2R
E
D
Operation value settings and using condition settings
1. Operation value settings
In general, the operation value settings are set as follow,
but these values should be set with due consideration
given to various conditions of the systems, such as
residual current, and protection coordination.
＜Setting examples＞
Power receiving point:
I =0.2～0.4A, T=0.2s
0
Branch feeder:
I =Equivalent or smaller to power receiving point
0
T=Instantaneous (70ms or less)
For details, please consult with an electric power
company.
MGR-A3V-R
Z Z P P a b
1 2 1 2
E
D
External resistance
(100Ω, 40W or more)
52a Pallet switch
C1T T1 a1
a2
C2T T2
MOC-A3V-R
Overcurrent relay
Fig. 3-5 No-voltage tripping type
【Tripping route】
E
(1) When a earth fault occurs, the contact between
c B B
1 2
E
D
(2) When a short circuit fault occurs, the trip
BZ
Buzzer
AC110V
AC100/110V
1. Connect
2.
3. Do not short-circuit kt and ℓt terminal of ZCT.
Current
changeover
switch
A
～
2. Using condition settings
For all
settings are set to a default of OFF.
(1) Frequency (SW1):
50Hz = ON, 60Hz = OFF
(2) Output contact (SW2) (MGR-A3V-R only):
Self-hold = ON, Auto-reset = OFF
12
c and b opens, then trip coil of CB is de-
energized and make CB trip.
contact between T1 and T2 closes, then trip
coil of CB is de-energized and make CB trip.
line.
This figure shows that MOC-A3V-R overcurrent
relay is combined.
using condition setting switches, factory
JEP0-IL9555