Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 18/165
© Woodward
Power Supply
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0
1
2
N
0 Vdc
D1
C1
C1 = 47,000 uF / 40 V
D1 = P600M
for 12 V DC systems
Power supply
9.5 to 32 V DC (in normal operation)
(min. 12 V DC to start)
9.5 to 32 Vdc
9.5 to 32 Vdc
Figure 3-3: Power supply
Terminal Description
A
max
0
N terminal of the low voltage system or neutral terminal of the voltage trans-
former/PT's (measuring reference point)
2.5 mm²
1
9.5 to 32 Vdc, 15 W
2.5 mm²
2
0 Vdc reference point
2.5 mm²
Note:
When used in a 12 Vdc system, please wire the power supply as described above.
Measuring Inputs
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NOTE
The three-phase system must have a dextrorotatory field (right-handed rotary field). If the unit is used
with a laevorotatory field (left-handed rotary field), the power factor measurement will not be correct.
Voltage
Generator
L1
L2
L3
N
Generator voltage
MCB
GCB
0
N
20
21
22
L3
L2
L1
G
Figure 3-4: Measuring inputs - voltage - generator
Terminal Measuring
Description
A
max
20
400 Vac direct
or via measu-
ring transducer
../100 Vac
Generator voltage L1
2.5 mm²
21
Generator voltage L2
2.5 mm²
22
Generator voltage L3
2.5 mm²
0
Neutral point of the 3-phase system/transformer/PT's
2.5 mm²