P&B MPR3E5 - 4 Design; Circuit Diagrams

14/1/98 Page 4 Issue H
4. Design
4.1 Circuit Diagrams
18
POWER
SUPPLY
1 2 CASE
Supply
MPR 3E5
Typical Earthing Shown
TRIP SIGNAL
7
5
3
6
4
8
10
14
12
+
17
15
16
Gnd
-
9
13
11
PROGRAMMABLE
ALARM
RS485
21
22
23
24
25
26
27
28
L1
L2
L3
I1
I2
I3
IE
S2
P2
P1
S1
CHASSIS
EARTH
19
20
SPEED SWITCH
I
E
27
28
CBCT
Alternative E/F connection
for CBT
Rstab
Fig 1 Connection Diagram for use with 3 line CT’s and alternative core balance CT.
18
POWER
SUPPLY
1 2 CASE
Supply
MPR 3E5
Typical Earthing Shown
7
5
3
6
4
8
10
14
12
+
171516
Gnd
-
9
13
11
RS485
21
22
23
24
25
26
27
28
L1
L2
L3
I1
I2
I3
IE
S2
P2
P1
S1
CHASSIS
EARTH
19
20
SPEED SWITCH
CBCT
Note: Core Balance CT must
be provided if earth fault
protection is required
TRIP SIGNAL
PROGRAMMABLE
ALARM
Fig 2 Special connection diagram when relay used with two line CT’s.