Mettler Toledo IND780 Installationsanleitung Seite 82

The maximum recommended cable length for the 4-20 mA output is 1,000 feet (300 meters). The
recommended cable for use with the analog output is shielded two-conductor stranded 20-gauge
cable (Belden #8762 or equivalent), which is available from METTLER TOLEDO using part number
510220190. Refer to Figure 2-89 for connection and termination information.
2-58
METTLER TOLEDO IND780 Installation Guide
Figure 2-88: Dual-Channel Analog Output Option Board
NOTES:
1. ERROR OUTPUTS MUST BE MONITORED TO DETERMINE WHEN
WEIGHT SIGNAL IS VALID.
2. ERROR SIGNALS ARE OPEN COLLECTOR, CURRENT SINKING
OUTPUTS.
3. VOLTAGE: 5-30 VDC, 200 MA MAXIMUM CURRENT.
4. USE TWO-CONDUCTOR SHIELDED CABLE FOR SIGNAL LINES.
5. MAXIMUM RESISTANCE OF DEVICE LOAD IS 500 OHMS.
6. THE VOLTAGE SOURCE FOR THE ERROR OUTPUTS MUST BE A
CLASS 2 MARKED OR A LIMITED POWER SOURCE (LPS)
COMPLIANT POWER SUPPLY.
7. PIN 5 COMMON 1 IS THE RETURN PATH FOR CHANNEL 1 (4-20MA
OUTPUT). PIN 6 COMMON 2 IS THE RETURN PATH FOR CHANNEL
2 (4-20MA OUTPUT). PIN 5 AND PIN 6 ARE NOT THE SAME AS
THE GND OF PIN 3 AND PIN 8.
8. WIRE SIZE: 14 AWG (2.1 mm
Figure 2-89: Analog Output Kit Wiring Connections
2
) MAXIMUM
2
22 AWG (0.3 mm ) MINIMUM.
64057253
Pin 1
| 14 | 08/2014