Power Supply Of The Instrument; Connection Of The Load Cells - Gicam RQA Handbuch

Power supply of the instrument

The instrument is powered through terminals 11 and 12.

 The power supply cable must be channeled separately from other power supply cables
with different voltages, from load cell cables, encoders and logical and analogue in-
puts / outputs.
The internal circuit is galvanically isolated from the supply voltage.
Supply voltage: 24 VDC ± 10%, maximum 1 W
11 Power supply + 24 VDC
12 Zero

Connection of the load cells

 Any cable extension connections must be carefully shielded, respecting the color code
and using the cable of the type supplied by the manufacturer. The extension connec-
tions must be made by welding, or through support terminal blocks or through the
junction box supplied separately.
 The cell cable must not be channeled with other cables (e.g. outputs connected to remote switches
or power cables), but must follow its own path.
 The cell cable must have a number of conductors not higher than those used (4 or 6). In the case of
6-conductor cable, of which only 4 are used (power supply and signal), connect the reference wires
to the respective polarity of the power supply wires.
Up to a maximum of four 350 ohm cells in parallel can be connected to the instrument. The cell power sup-
ply voltage is 4 V DC and is protected against a temporary short circuit. The measuring range of the instru-
ment involves the use of load cells with sensitivity from 1 mV / V to 2.5 mV / V. The load cell cable must be
connected to terminals 2 ... 7 of the 7-pin removable terminal block. In the case of a 4-wire cell cable, con-
nect the cell power terminals to the respective polarity of the reference terminals (2-5 3-4).
Connect the shield of the load cell cable to the terminal 1.
Connection with 4 wires
Power supply +
Power supply -
Signal + Signal -
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Connection with 6 wires
Power supply +
Reference +
Reference -
Power supply -
Signal +
11
Signal -