Optimus UP120M4 Manual page 12

3. REAR VIEW.
(1) SECURITY PAGING AUXILIARY RELAYS.
They are switched when the corresponding priority contacts
of the PRIORITY channels are activated.
(2) LOUDSPEAKERS LINE OUTPUTS.
The Loudspeakers line outputs are done by means of transformers with low impedance outputs
(8 Ohms) and high impedance outputs (70-100 V).
The connection is made between the
"0" (common) terminal and the one
corresponding to the
impedance or voltage.
(3) CONNECTION TO THE 230 V.a.c.
MAINS.
The rear panel has a male base for
the CEE22 supply which allows its
connection to the mains by means of
the cable included.
Attention: this equipment
cannot be splashed or
exposed to water.
(4) MAINS FUSE.
It is located into the lower box of the power supply base. In the same box there is a replacement
fuse as well.
(5) BATTERY SUPPLY INPUT.
This supply allows the use of these amplifiers in security installations, connecting the same to a
24 V.d.c. battery.
The ON/OFF switch doesn't cut the supply from the battery.
(6) CONNECTION OF THE GROUND TO THE FRAME.
In all P.A. installations, it is very important to have only a joining point between the signal
ground and the mains ground contact.
If the P.A. installation is made up of several equipments, they will probably have the frames
joined either by means of the ground terminal of the mains connection, or because they are
14
UP120M4 AMPLIFIER
chosen
Fig. 3a
Fig. 2
Fig. 3
mounted in a rack cabinet.
If the grounds are also joined
by the signal circuits, it is
advisable to remove
jumper between the ground
and the frame of
equipments excepting one.
UP120M4
the
all