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887U
The instruction manual is downloadable from the site www.
vimar.com
Description
Article 887U is a universal interphone that can be used
either in conventional systems with AC call or in installa-
tions with electronic call (Sound System type). The univer-
sal interphone is compatible with most interphones on the
world market so it's the ideal solution to replace an obso-
lete appliance without having to renew the entire entrance
system. For details of connections and settings refer to
the compatibility table on page 10, 11. The interphone is
equipped with a door lock control button and trimmer to
optimise speech volume on the handset.
IMPORTANT NOTE FROM ELVOX:
in existing systems the speech volume level in both
transmission and reception may be impaired due to the
presence of defective units on which the speech circuit
remains open due to a fault.
Settings and adjustments
To make the necessary settings and adjustments access
the circuit board mounted on the metal base of the unit.
The settings consist in setting two jumpers that serve to
choose the type of call and the common reference of the
installation. Adjust trimmers R1 and R2 with a screwdriver
to optimise the speech level on the handset.
CN4
terminal board
CN5
connector for call type selection
CN6
jumpers for selection of negative or positive
common connection
R1
trimmer for external volume adjustment
R2
trimmer for internal volume adjustment
Terminal Board CN4
1
loudspeaker
2
microphone
3
common
6
call
7
lock
Call type setting (connector CN5)
Adhere to the following table to select the appropriate
type in relation to the plant.
The AC call uses a buzzer; the electronic call uses the
loudspeaker in the handset in the rest position.
JUMPER SET BETWEEN
"E" and CENTRAL PIN
OF
CONNECTOR CN5
(fig. 1)
JUMPER SET BETWEEN
"C.A." and CENTRAL PIN
OF CONNECTOR CN5
(fig. 1)
Installation common setting (connector
CN6)
Adhere to the following table for selection of the installa-
tion's COMMON reference. Generally the common ref-
erence is the negative (-), as for all ELVOX systems, but
in some cases the installation may have a positive (+)
reference.
JUMPER BETWEEN "-"
and "C" OF CONNECTOR
CN6 (fig. 1)
JUMPER BETWEEN "+"
and "C" OF CONNECTOR
CN6 (fig. 1)
Fine adjustment of internal and external
volume
NOTE that the primary adjustment of speech volume lev-
els is mainly dependent on the power supply and/or ex-
ternal speech unit of the system. To optimise the speech
volume level on the handset use trimmers R1 and R2 (see
fig. 1). Microphone gain (VOL. EXT.) can be optimised
with R1, while R2 serves to optimise the speech volume
level of the receiver (VOL. INT.).
Loudspeaker impedance values
ELECTRONIC CALL
LOUDSPEAKER
IMPEDANCE
HANDSET
LOUDSPEAKER
IMPEDANCE
EN
ELECTRONIC CALL
(ELVOX Sound
System technology
INTERPHONES)
AC CALL
NEGATIVE COMMON (-)
POSITIVE COMMON (+)
16 OHM
ADJUSTABLE FROM 16
OHM TO APPROX. 120
OHM BY MEANS OF
TRIMMER R2
3
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