Reer MJBOX MJB1 User manual

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INTERCONNECTION BOXES
JANUS MJBOX
GENERAL DESCRIPTION
The REER MJBOX modules can be used for the electrical connection of the Janus light
curtains. They provide the external commands of the light curtain as well.
The MJBOX modules contain terminal boards, pre-wired connections as well as dip
switches for the configuration of the light curtain.
•MJB1 and MJB2 have two relays (K1 and K2 in picture 3), supplying two N.O. guided
contacts
•MJB3 and MJB4 have two relays (K3 and K4 in picture 3), supplying two N.O. and one
N.C. guided contacts.
Picture 1 shows the modules MJB1/MJB3. These two modules can be connected with the
light curtains of the series Janus M (with the muting function).
On the front panel the RESTART command button, the key selector for the muting
OVERRIDE function and the active muting signal lamp are present.
RX JANUS
TX JANUS
PASSAGGIO
CAVI
LAMPADA
MUTING
KEY
OVERRIDE
RESTART
Picture 1 – MJB1/MJB3
OVERRIDE
KEY
MUTING
LAMP
CABLES
PASSAGE

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Picture 2 shows the modules MJB2/MJB4. These two modules can be connected with the light
curtains of the series Janus J (no muting function).
On the front panel the RESTART command button is present.
TX JANUS
RX JANUS
PASSAGGIO
CAVI
RESTART
Picture 2 – MJB2/ MJB4
CONFIGURATION SELECTIONS
MJBOX are supplied with an initial factory configuration; if this selection does not respond to the
customer necessities the microswitch SW1 (Picture 3) must be set referring to the table 1 and to the
technical manual of the JANUS light curtain.
Picture 3
CABLES
PASSAGE
SW1
CJ6
CJ7
CJ5
CJ4
CJ9
ON
OFF
CJ8
K3 K4
K1 K2

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SW1 NAME DESCRIPTION FACTORY SELECTION
1 CONF3 OFF
2 CONF2 ON
3 CONF1 *OFF
4 CONF0 *
Muting features
configuration
OFF
Muting timeout = 30sec
selected
(“L” or "T" operation)
5 RESTART OFF
6 MAN_AUTO
Manual/Automatic
operation selection
and RESTART signal ON Manual operation selected
7 SEL_RANGE2 OFF
8 SEL_RANGE1
See table:
“TEST AND RANGE SELECTION”
on the JANUS Technical Manual ON Low range selected
Table 1 – MJB1/MJB3 configuration
* CONF0 and CONF1 are not active on MT and ML models.
ON = Light curtain input connected to +24 Vdc
OFF = Light curtain input connected to 0 Vdc
Note: For the operation selection, please refer to the JANUS technical manual.
JUMPER PIN DESCRIPTION FACTORY SELECTION
1 – 2 External lamp enabled
CJ5 2 – 3 Internal lamp enabled Internal lamp enabled
1 – 2 Internal relays feedback
CJ8 2 – 3 External relays feedback Internal relays feedback
1A – 2A 1B – 2B Override 1 (OVERRIDE KEY hold to run)
CJ9 2A – 3A 2B – 3B Override 2(OVERRIDE KEY
hold and released)
Override 1
(OVERRIDE KEY
hold to run)
Table 2 – MJB1/MJB3 configuration
SW1 NAME DESCRIPTION FACTORY SELECTION
1 - -
2 - -
3 - -
4 -
Not applicable
-
-
5 RESTART OFF
6 MAN_AUTO
Manual/Automatic
operation selection
and RESTART signal ON Manual operation selected
7 SEL_RANGE2 OFF
8 SEL_RANGE1
See table:
“TEST AND RANGE SELECTION”
on the JANUS Technical Manual ON Low range selected
Table 3 - MJB2/MJB4 configuration
ON = Light curtain input connected to +24 Vdc
OFF = Light curtain input connected to 0 Vdc
Note: For the operation selection, please refer to the JANUS technical manual.

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INSTALLATION AND ELECTRICAL CONNECTIONS
•The MJBOX modules can be fixed to the wall, using the proper plastic brackets inserted in the
holes placed on the box rear side corners. These brackets can easily rotate to reach 90°.
•The curtain must be connected using cables to the respective M12 and M23 connectors
(Fig. 1 e 2).
•The cables coming out from the fairlead must be connected - depending on its utilization - to the
connectors CJ6 e CJ7 (Tables 4 and 5).
CJ6 NAME DESCRIPTION
1 +24Vdc 24 ±20%
2 0V 0 Vdc
3 PE Earth terminal
4 SYSTEM STATUS Ref. JANUS technical manual
5 NA2_B
6 NA2_B Normally open contact n°2
7 NA1_A
8 NA1_A Normally open contact n°1
9 NCB
10 NCA
Normally closed contact connected in parallel
(only for models MJB3 and MJB4)
Table 4
CJ7 NAME DESCRIPTION
1 SEL_RANGE1 Possible range selection external command
2 EXT LAMP External MUTING lamp (24Vdc; max 5W)
3 OSSD1 Self-checked PNP OUT1 – 500 mA @ 24 Vdc
4 OSSD2 Self-checked PNP OUT2 – 500 mA @ 24 Vdc
5 K1_K2 Feedback K1/K2
6 SEL_RANGE2 Possible range selection external command
Table 5
OUTPUT RELAYS FEATURES
The modules use for the output circuits (pin 5-6 and 7-8 of CJ6 on MJB1 e MJB2),
(pin 5-6, 7-8 and 9-10 of CJ6 on MJB3 e MJB4)two safety relays with guided contacts.
These relays are specified by the supplier for voltages and currents higher than values of
the technical data. Nevertheless for a correct insulation and to avoid damagement or quick
ageing, protect every output line with a 6A delayed fuse and verify that the load features
comply with the indications of the following table.
Maximum switching voltage 250 Vac
Maximum switching current 2A