Kobold ZOK-ExK, Operating Manual

Page: 8 / 60

ZOK-E/-Z
Page 8 ZOK K14/0917
7.4 Power Supply
Depending on functionality and features, the electronics offer different possibilities for
power supply:

Options ZOK-Z2: External DC-Supply

Options ZOK-Z1: Battery and ext. DC-Supply

Options ZOK-Z3: Battery and ext. DC-Supply and 4-20 mA
Loop current
7.4.1 Storing the counter readings
The storage of meter readings is carried out after each measurement cycle in the
internal FRAM. If the power is interrupted and re-applied, than the meter reading revert
to the last saved values.
7.4.2 External DC-Supply
When electronic units are supplied with external DC voltage, all functions are
available. If no analogue output is used, all instrument functions are ensured on 5 V
DC
.
When using the analogue output in 3-wire circuit, the supply voltage must be minimum
10 VDC (+ load).
7.4.3 Supply via 4-20 mA Current Loop (only ZOK-Z3 with supply option ‘3’)
The electronic option ZOK-Z3 can alternatively be operated via 4-20 mA current loop
in 2-wire operation. Here we have the following technical limitations:

All other electrical outputs (switching outputs, pulse output and status output) are
disabled

The backlight of the display is switched off and cannot be turned on.

Sensors that do not require an additional power supply can be connected (e.g.
reed switch). Hall sensors require the additional power supply and can therefore
not be used in 2-wire loop operation. In this case, the 3-wire connection must be
used with an external power supply.

To use the 2-wire loop operation, the parameter ‘Wiring type’ in configuration
menu for analogue output must be changed to ‘2-wire’, otherwise the current
output will not be scaled correctly.

For electronics option Z2, no battery can be used due to the relay
board.

If the device is taken out of operation and not used for longer periods,
the battery must be removed. Otherwise, the device is always supplied by
the battery and remains active. As a result, the battery can get discharged.