Esser 8000C - Page 141

Fire Alarm Computer 8000C / M
Page 141
Important installation instructions of essernet
®
micromodules
♦
The outgoing and return line of the essernet
®
link must always be installed separately, i.e. not in
a multiple-pair cable or cable duct. Installing them together may impair operation or, in the
event of irreparable damage to the cable/cable duct, lead to failure of the connection because
of a break in the outgoing and return line.
♦
Repeaters may be used if the length of cable between two essernet
®
devices is greater than
1000m. No more than two repeaters are permissible between two essernet
®
devices. Each
repeater can be used to span a length of 1000m. This produces a max. cable length of 3000m
between two essernet
®
devices. Repeaters are installed in a metal enclosure which is protected
to IP65 when properly installed. The voltage can be supplied from control panel or an external
power supply unit. The operating voltage range for a repeater is 8-18V DC/ 150mA, bearing in
mind the voltage drop in relation to line length or line cross sectional area.
♦
Different overvoltage protection modules are have been approved for the two essernet
®
micro
module types (ESSER information sheet on "Overvoltage protection in hazard alarm systems",
part no. 798410).
♦
Always avoid installing an essernet
®
line together with lines from the power supply, motor
control lines, phase control lines or other live switch cables.
Possible fault causes
♦
Breaks or twists in the essernet
®
connection line
♦
Damage to the LAN cable (500kB, module type 2) as a result of inadmissible bending radii.
♦
The eight coding bridges incorrectly set for the essernet
®
micro module terminal card in the fire
alarm control panel.
♦
essernet
®
address incorrectly set on the DIL switch of the essernet
®
micro module (display:
SYS fault essernet control panel: xx), red LED lights up on the essernet
®
micro module. The
address of the micro modules starts from number "0", the control panel address from number
"1". The control panel with address "1" contains the essernet
®
micro module with address "0"
etc..
♦
Line too long or attenuation too high. Typical loop resistances in relation to line length: IBM
cable type 1 approx. 100 ohms/km, or IY-ST-Y 0.8 approx. 70 ohms/km.
♦
The control panel or non-identified user is in failure mode or in the process of starting, e.g. after
a reset.
♦
Control panel or essernet
®
user dead or connection line open at both ends.
♦
Fire alarm system 8000 is equipped with a special troubleshooting aid.
(see chapter 10.3 “the essernet
®
-Diagnostic line“).
essernet

modu
le