Product manual

Product Manual - DM991 Series V Family - 204.4092.08 85
21. ANNEX I – SAFETY WARNINGS
Before the installation, read the entire manual attentively.
The power supply, where the supply cable is connected, must be positioned near the equipment and be
on an easily accessible location, because the equipment is turned on and off through it .
Follow attentively every guidance included in this manual. In case of doubts, please con
tact the
authorized technical support.
Before connecting any cable to the equipment, make sure that the grounding system is functional.
There must be no voltage difference between the DM991
DB9 pin 5 (signal ground) and the PC DB9 pin 5
(or DB25 pin 7). This can cause damage the DM991 and PC serial interfaces. To be sure to avoid this,
use
an AC voltmeter to measure the voltage between these pins. If there is voltage difference, check if the
modem and the PC are properly grounded. It is not necessary to turn the equipment off to plug in the
serial cable, if the above conditions are met.
In case of using DC voltage, you must be careful so that the equipment protection earth cable (green
cable with yellow line related to the central socket pin) matches the system protection earth cable. This
cable must be connected before any other connection.
The equipment supports an 1
A fuse, type T (delay), 250 V. If necessary, replace it only for another one of
the same type and value.
Always observe the instructions of security during the installation, operation or m
aintenance of this
product. Installation, adjustment or maintenance must be carried through only by qualified, trained and
authorized people.
To prevent risks of electric shock, before opening the DM991C/CE equipments, disconnect the
power
supply.