30
•
Default configuration
As shipped from the factory, the CN2 connector allows the
TARE, MAX/MIN and RESET operations be made in the same
way as from the front-panel keyboard and incorporates one
more function: the display HOLD.
The HOLD state, which is acknowledged by the LED "HOLD",
freezes the display.
From factory the logical inputs are NPN configured
.
CN2 : DEFAULT CONFIGURATION
PIN (INPUT)
Function
Number
PIN 1 (INP-1)
RESET
Function nº 7
PIN 2 (INP-2)
HOLD
Function nº 9
PIN 3
COMMON
PIN 4 (INP-4)
TARE
Function nº 1
PIN 5 (INP-5)
MAX/MIN
Function nº 6
The external electronics (see fig. 30.1) applied to the CN2
connector must be capable of withstanding 40V and 20mA
present at all terminals with respect to COMMON. In order to
guarrantee the electromagnetic compatibility, please refer to
the instructions given on page 10.
3.2 – REMOTE FUNCTIONS
The rear connector CN2 provides 4 user programmable optocoupled inputs NPN or PNP that can be operated from external
contacts or logic levels supplied by an electronic system. Four different functions may be then added to the functions available
from the front-panel keys. Each function is associated to one of the CN2 connector pins (PIN 1, PIN 2, PIN 4 and PIN 5)
referred to PIN 3 .
Each pin can be assigned one of the 31 functions listed on the following pages.
Fig.. 30.2 Conection
examples. PNP, NPN or
switch.
10
CONNECTORS
To perform wiring connections, remove
the terminal block from the meter's connector,
strip the wire leaving from 7 to 10 mm exposed
and insert it into the proper terminal while pushing
the fingertip down to open the clip inside the
connector as indicated in the figure.
Proceed in the same manner with all pins and plug the terminal block
into the corresponding meter's connector.
Each terminal can admit cables of section comprised between 0.08 mm²
and 2.5 mm² (AWG 26 ÷ 14).
The blocks provide removable adaptors into each terminal to allow
proper fastening for cable sections of <0.5 mm².
POWER CONNECTION-CN1
AC
VERSIONS
PIN 1 - AC HI
PIN 2 - GND (GROUND)
PIN 3 - AC LO (NEUTRAL)
DC
VERSIONS
PIN 1 - DC POSITIVE
PIN 2 - N/C (no connection)
PIN 3 - DC NEGATIVE
INSTALLATION
To meet the requirements of the directive EN61010-1, where the unit
is permanently connected to the mains supply it is obligatory to install
a circuit breaking device easy reachable to the operator and clearly
marked as the disconnect device.
WARNING
In order to guarantee electromagnetic compatibility, the following
guidelines for cable wiring must be followed:
-
Power supply wires must be routed separated from signal wires.
Never
run power and signal wires in the same conduit.
-
Use shielded cable for signal wiring and connect the shield to
ground of the indicator (pin2 CN1).
-
The cable section must be
$
0.25 mm
If not installed and used according to these instructions,
protection against hazards may be impaired.
Fig. 30.1
Changing the logical CN2
3 2 1 J1
•
•
•
•
•
•
6 5 4 J2
CN2 input type
PNP J1 (2-3) and J2 (5-6)
NPN J1 (1-2) and J2 (4-5)
