Manual 37353A
MFR 13 Packages - Protection Relay
© Woodward
Page 79/91
Examples
V
G12
= 103, exponent = 2
103 × 10
2
[V] = 1,030 [V] =
10.3 kV
I
G1
= 80, exponent = -1
80 × 10
-1
[A] = 8.0 [A] =
8.0 A
P
GN
= 123, exponent = 4
123 × 10
4
[W] = 1,230,000 [W] =
1.23 MW
P
GN
= 803, exponent = 2
803 × 10
2
[W] = 80,300 [W] =
80.3 kW
f
GN
= 5230
5230 [Hz × 100] = 52.30 [Hz] =
52.3 Hz
Power factor = 87
87 [Cos phi × 100] = 0.87 [Cos phi] =
i0.87
Bit Change at Tripping of a Watchdog Function
If one of the watchdog functions (protective alarms) trips, the corresponding bits (for example bit 15/14 = over-
frequency limit 2) will change from not tripped (= 0/1) to tripped (= 1/0).
Framework Data for the Interfaces
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
Framework Data for Modbus RTU Slave
Transmitting protocol..........Modbus RTU Slave
Hardware.............................Interface RS-485
Transmission rate ................adjustable
Slave address.......................adjustable
Parity ...................................adjustable
A maximum of 10 words can be read or 4 words written with one command. Modbus function codes 03, 04, 06
and 16 are supported.
MFR 1
2005-08-31 | Data coupling 2005-08-31.skf
PI
N
5
GND
R
S
-485
External device
PLC
A = not-inverted
B = inverted
GND
R
S
-485
X3
X1
X2
A
B
X4
X5
7
2
RS-485 Modbus RTU Slave
A
B
Figure 7–3: Interface - Modbus connection
