Auxiliary Dc Backup Power Supply - Satec Expertmeter EM720 Operation Manual

Chapter 2 Operating the EM720
USB Communications

Auxiliary DC Backup Power Supply

28
NOTE
When you add new modules to the meter, or change their
location in the expansion slots, or change either Ethernet
or GPRS network parameters, the meter logs out of the
network and logs on again so the IP address you might
use for connecting to the meter will no longer be
supported. You should check the meter for a new GPRS IP
address either from the front display, or via PAS.
An optional Ethernet/USB module provides a full speed
12-Mbit USB 1.1 port for local communications with the
support PAS software.
The USB module can be installed in the expansion slot 1 or
2.
USB communications does not require any settings. Just
connect your PC to the EM720 USB port using the supplied
USB cable with a mini-USB connector and install the USB
driver provided on the CD with your meter (see
the USB Driver in Chapter 4).
To prevent potential differences between the PC USB port
and the EM720 USB device port, it is recommended to use
a galvanically isolated USB adaptor before connecting the
EM720 USB port to a PC, or to use a battery powered PC.
An auxiliary DC backup power supply module can be
provided for powering the meter from an external 24VDC
power source, like a station battery, in the event of power
outages. It can be used either as a replacement for the
internal NiMH backup battery, or as an additional backup
power source for maintaining continuous uninterrupted
operation of the meter.
The module can be installed in any expansion slot.
See the EM720 Installation Manual for the power supply
ratings and connection diagrams.
The module is provided with two indication LEDs that
operate as follows:
LED Color Status
VIN Green Lights
VOUT Green Lights/
Shut off
Auxiliary DC Backup Power Supply
External DC voltage is applied to the input
terminals
Lights- the module supplies the power to
the meter while the AC voltages are not
available on any reason
Shut off – the module is in standby while
the meter is powered from the AC inputs
EM720 Power Quality and Revenue Meter
Installing
Description