User’s & Technical Manual –
LEVEL TRANSMITTER LTR7000
GELEC
Industrial Electronics
PAGE
18
CONNECTION TERMINALS
Read carefully the following information and refer to the connection diagrams and technical
data, regarding proper wiring of the LTR7000 with the associated equipment.
Confirm that you have proper connections before unit operation. Wrong connections may
lead to permanent device or external equipment damage.
Don’t proceed to any connection
modification, while the unit is powered.
TERMINALS #1 - #2
(POWER SUPPLY - V
PS
)
Connect the power supply
(15-36 VDC)
to terminals
#1 (+)
and
#2 (-)
.
Maximum power consumption is approximately 2.5W. There is not an electrical safety fuse
in the internal power circuit. Although there is polarity protection, ensure that you are
applying proper voltage and polarity.
TERMINALS #2 - #6
(ERROR OUTPUT)
Terminals
#2
(COM)
and #
6 (V
PS
-1V)
provide the Error output signal during operation.
An internal
High Side Driver
provides a voltage output signal during
ERROR
state, almost
equal to power supply voltage (V
PS
-1V).
The output current limit is
500mA
, while the Current Limit Initial Peak is
3A max
.
I
f you don’t need this output, leave the relevant terminals unconnected. Refer to the
relevant section in this manual for more information.
TERMINALS #5 - #4
(V OUTPUT SIGNAL)
Terminals
#5
(V
OUT
)
and #
4 (COM)
provide the Voltage output signal during operation.
The output range
(0…5V
/ 0...10V)
can be selected from the internal configuration dip
switch. Refer to the relevant section in this manual for more information.
The output continuous current limit is
10mA
, with an overcurrent protection of
30mA max
.
If you are going to use the
V OUTPUT
without using the
mA OUTPUT
,
you must connect a
390
Ω
resistor to the
mA OUTPUT
(terminals 3-4). Check the relevant connection diagram.
For having the signal unaffected from any interference, it is recommended to use a shielded
cable with twisted pair, properly grounded at the side of the signal receiving device.
Ensure that the mA output range is not set to 4-21mA setting.
Voltage output doesn’t have
a normal behavior with this mA setting selected and cannot be used
.
