Operation Manual

FP+ Series Operation Manual 22
6.1 Maintenance
During normal operation your FP+ Series amplier
will provide trouble-free service. The only user main-
tenance required is to periodically vacuum clean the
foam dust-lters behind the front grille.
In some extreme cases it may be necessary for
authorized service personnel to clean the inside of
the amplier. These conditions usually occur after
prolonged use in extreme environments such as
those using “cracked oil” smoke machines. If you
are using your amplier in a heavy duty application,
it is recommended to have your amplier serviced
every 3 years purely as a preventative action.
6.2 FAQ
Following are common questions asked about
Lab.gruppen FP+ Series power ampliers together
with helpful answers.
Q: What is the input sensitivity of the ampliers?
A: Input sensitivity is calculated from the amplier
gain, maximum output voltage and load. As gain and
output voltage is adjustable in FP+ Series ampliers,
you need to look this information up in a table found in
the Appendix section of this manual. Input sensitivity
also is automatically calculated in the DeviceControl
software application.
Q: What are the maximum cable lengths allowed
when using the NomadLink network?
A: NomadLink uses a daisy-chain topology to
connect ampliers and an NLB 60E in a network.
Standard RJ45-equipped Cat-5 cables are used
throughout. The daisy chain may be made into
a closed-loop by connecting a return cable to the
NLB 60E from the last amplier.
General rules of cable lengths:
▸ The maximum cable length in between any
two devices may not exceed 300 meters / 980
feet.
▸ In a non-closed-loop daisy-chained subnet the
maximum cable length is 400 meters / 1300
feet.
▸ In a closed-loop subnet the maximum cable
length is 700 meters / 2300 feet.
Exceeding these limits may result in lost contact
with the devices, or loss of phantom powering due
to cable resistance.
Q: How long can cable-runs be on the Ethernet
network connecting the NLB 60E to the PC?
A: On the Ethernet side, normal Ethernet cable limits
apply. This is typically a maximum of 80 meters / 300
feet between each device. Follow standard instal-
lation procedures for Ethernet. Distances beyond
100 meters may require use of a repeater, a format
converter, or optical cables.
Q: Why is the NomadLink network a closed-loop
topology?
A: Technically speaking, the closed loop is
optional. The purpose of closing the loop is primarily to
provide a secondary path to the ampliers. If cables
are broken or disconnected in either direction, all
ampliers still may be addressed by the network.
Q: How can I be sure that no protection circuits or
safety functions interfere with the output signal?
A: If no Clip or Warning LEDs on the front panel light
up, you can be fully condent that the rated maximum
output power in the full frequency range is available
for your speakers. No limiting or gain-reduction takes
place without a warning or fault indication.
6.3 Additional documentation
In case you didn’t nd what you were looking for
in this Operation Manual, check out the website
at www.labgruppen.com, where you can nd a mul-
titude of additional documentation for FP+ Series.
APPENDIX 6