LD303 - Operation and Maintenance Instruction Manual
1.10
Figure 1.6 - Terminal Block
The
LD303
uses the 31.25 kbit/s voltage mode option for the physical signaling. All other devices on
the same bus must use the same signaling. All devices are connected in parallel along the same
pair of wires.
Various types of Profibus devices may be connected on the same bus.
The
LD303
is powered via the bus. The limit for such devices is according to the DP/PA coupler
limitation for one bus for non-intrinsically safe requirement.
In hazardous area, the number of devices may be limited by intrinsically safe restrictions, according
to the DP/PA coupler and barriers limitation.
The
LD303
is protected against reverse polarity, and can withstand ±35 VDC without damage, but it
will not operate when in reverse polarity.
The Figure 1.7 shows the correct installation of the conduit, in order to avoid penetration of water, or
other substance, which may cause malfunctioning of the equipment.
Figure 1.7 - Conduit Installation Diagram
NOTE
The transmitters are calibrated in the vertical position and a different mounting position displaces
the zero point. Consequently, the indicator will indicate a different value from the applied
pressure. In these conditions, it is recommended to do the zero pressure trim. The zero trim is to
compensate the final assembly position and its performance, when the transmitter is in its final
position. When the zero trim is executed, make sure the equalization valve is open and the wet
leg levels are correct.
For the absolute pressure transmitter, the assembly effects correction should be done using the
Lower trim, due to the fact that the absolute zero, is the reference for these transmitters, so there
is no need for a zero value for the Lower trim.
CORRECT
WIRES
INCORRECT
Содержание LD303
Страница 1: ...Profibus PA Pressure Transmitter L D 3 0 3 M E...
Страница 8: ...LD303 Operation and Maintenance Instruction Manual VIII...
Страница 15: ...Installation 1 7 Figure 1 1 f Dimensional Drawing and Mounting Position Sanitary Transmitter with Extension...
Страница 22: ...LD303 Operation and Maintenance Instruction Manual 1 14...
Страница 26: ...LD303 Operation and Maintenance Instruction Manual 2 4...
Страница 49: ...Configuration 3 23 Figure 3 24 Block Mode for Totalizer Block Figure 3 25 Set Reset for Totalizer Block...
Страница 74: ...LD303 Operation and Maintenance Instruction Manual 4 6 Figure 4 4 Exploded View...
Страница 83: ...Maintenance Procedures 4 15 Figure 4 8 TPE Software Screen...
Страница 102: ...LD303 Certifications Information A 4 CSA NEMKO and EXAM CEPEL NEPSI...
Страница 104: ...LD303 Certifications Information A 6 CEPEL...
Страница 105: ...Appendix A A 7 Control Drawing Factory Mutual FM...
Страница 106: ...LD303 Certifications Information A 8...
Страница 108: ...LD303 Operation and Maintenance Instruction Manual B 2...