Camille Bauer EURAX DME 440 Mode D'emploi page 37

Symbols Meaning
Q Reactive power of the system
Q = Q1 + Q2 + Q3
Q1 Reactive power phase 1
(phase-to-neutral L1 – N)
Q2 Reactive power phase 2
(phase-to-neutral L2 – N)
Q3 Reactive power phase 3
(phase-to-neutral L3 – N)
S Apparent power of the system
S = √ I
+ I
2
1 2
S1 Apparent power phase 1
(phase-to-neutral L1 – N)
S2 Apparent power phase 2
(phase-to-neutral L2 – N)
S3 Apparent power phase 3
(phase-to-neutral L3 – N)
Sr Rated value of the apparent power of the
system
PF Active power factor cosϕ = P/S
PF1 Active power factor phase 1
PF2 Active power factor phase 2
PF3 Active power factor phase 3
Reactive power factor sin ϕ = Q/S
QF
QF1 Reactive power factor phase 1
QF2 Reactive power factor phase 2
QF3 Reactive power factor phase 3
LF Power factor of the system
LF = sgnQ · (1 – PF)
LF1 Power factor phase 1
sgnQ1 · (1 – PF1)
LF2 Power factor phase 2
sgnQ2 · (1 – PF2)
LF3 Power factor phase 3
sgnQ3 · (1 – PF3)
c Factor for the intrinsic error
R Output load
Rn Rated burden
H Power supply
Hn Rated value of the power supply
CT c.t. ratio
VT v.t. ratio
MODBUS is a registered trademark of Schneider Automation Inc.
®
· √ U
+ I + U + U
2 2 2 2 2
3 1 2 3
P1/S1
P2/S2
P3/S3
Q1/S1
Q2/S2
Q3/S3
MODBUS (Bus interface RS-485)
®
Connections: GND on pin 2d
Tx- / Rx- on pin 6z
Tx+ / Rx+ on pin 6d
(see Fig. 5)
Connecting cable: Screened twisted pairs
Max. distance: Approx. 1200 m (approx. 4000 ft.)
Baudrate: 1200 ... 9600 Bd (programmable)
Number of bus station: 32 (including master)
Dummy load: Not required
Input
Waveform: Sinusoïdal
Rated frequency: Acc. to type label
50, 60 or 16 2/3 Hz
Own consumption [VA]
(with external
Voltage circuit: ≤ U
power supply):
Current circuit: ≤ I
Continuous thermal ratings of inputs
Current circuit 10 A 400 V
Voltage circuit 480 V single-phase AC system
831 V three-phase system
Short-time thermal rating of inputs
Input Number
variable of
inputs
Current circuit 400 V single-phase AC system
693 V three-phase system
100 A 5
250 A 1
Voltage circuit 1 A, 2 A, 5 A
Single-phase
AC system
600 V
H : 1.5 Ur 10
intern
Three-phase
1040 V
H : 1.5 Ur 10
intern
/ 400 kΩ
2
· 0.01 Ω
2
single-phase AC system
693 V
three-phase system
Duration Interval
of between two
overload overloads
3 s 5 min.
1 s 1 hour
10 s 10 s
10 s 10 s
37