External Power Supply; Pulse, Status And Encoder Inputs - Elster EK260 Operating Manual And Installation Instructions

B-3 External power supply
Designation
Cable termination
Screening
Nominal data:
Supply voltage:
Supply current:
B-4 Pulse, status and encoder inputs
Three digital inputs with common ground (minus pole) for reed conta cts, transistor
switches or encoder interface (only Input "DE1").
Each input can be parameterised and sealed separately.
Designation
Nominal data
F
For data which is not mentioned here, the limits in the certificate of conformance must
be observed when using the EK260 in Ex Zone 1.
a) Application as LF pulse or signal input (Md.I1, Md.I2, Md.I3 ≠ 5):
Open-circuit voltage
Internal resistance
Short-circuit current
Switching level "on":
Switching level "off"
Pulse duration
Space duration
Counting frequency
b) Use of Input 1 (terminal "DE1") as encoder input (Md.I1 = 5):
Open-circuit voltage
Internal resistance
Short-circuit current
Switching level "on":
Switching level "off"
Baud rate
Data format
Flow measurement uncertainty
1
If the meter reading supplied by the encoder does not change for 200 s, Qm is set to "0"
(e.g. at 1.8 m3/h for counters with one decimal place). With meter reading changes at
intervals of less than 20 s the measurement is more accurate.
Elster GmbH
Uext
Plug-in terminals; 0.5 ... 1.5 mm²
With flexible cable use core-end sleeves.
Connect cable screen to the cable gland.
U = 9.0 V ± 10%
≤ 40 mA
I
DE1... DE3
≈ 5.0 V
U
0
≈ 1 MΩ
R
i
≈ 5 µA
I
s
≤ 100 kΩ or
R
e
≥ 2 MΩ
R
a
≥ 62.5 ms
t
e
≥ 62.5 ms
t
a
≤ 2 Hz (see chapter 4.4)
f
≈ 8 V
U
0
≈ 820 Ω
R
i
≈ 8 mA
I
s
≤ 1.2 mA
I
e
≥ 2.1 mA
I
a
2400 Bd
7 data bits, even parity, 1 stop bit ("7e1")
≤ 10%
1
E
Q
Volume Conversion Device EK260
U < 0.8 V
e
or U > 3.0 V
a
(7...9 V)
(6...10 mA)
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