87
UMG 509-PRO
www.janitza.com
Determining pulse valency
1.Set the pulse length according to the require-
ments of the connected pulse receiver. With a
pulse length of 30 ms, for example, the device
can emit a maximum of 60,000 pulses (see table
“Maximum number of pulses”) per hour.
2.Determine the maximum connected load.
Example:
Current transformer = 150/5 A
Voltage L-N
= max. 300 V
Power per phase
= 150 A x 300 V
=
45 kW
Power with 3 phases = 45 kW x 3
Max. connected load = 135 kW
3.Calculate the pulse valency:
Pulse valency =
Max. connected load
Max. number of pulses/h
[Wh/pulse]
Pulse valency = 135 kW / 60000 pulses/h
Pulse valency = 0.00225 kWh/pulse
Pulse valency = 2.25 Wh/pulse
+
-
230 VAC
24 VDC
External
Operating voltage
1.5k
Data logger
UMG 509-PRO
Switching and pulse outputs
Fig.: Connection example for wiring as a pulse output.
+24V=
INFORMATION
When using the digital outputs as pulse outputs,
measurement errors can occur due to residual
ripple.
For the supply voltage (DC) of the digital
inputs and outputs, use power supplies whose
residual ripple is less than 5% of the supply
voltage.
