Siemens SITRANS LR 300, Instruction Manual, Page: 9 / 140

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 7
mm
mmm
Specificat
io
ns
Specifications
SITRANS LR 300
Power
• 24–230 Vac, +15%, 40–70Hz, 28 VA (11W)
or
• 24–230 Vdc, +15%, (9W)
Normal start up takes about 2 seconds to power up the unit. If something (such as
hesitation in plugging in the unit) causes a rapid power fluctuation, the unit will shut
down for 10 seconds to ensure the inrush current will not exceed specified limits.
Fuse
• FU1 & FU2, Fast Acting Ceramic Bussmann ABC fuse, 1 Amp. 250V.
Interface
• analog output: optically-isolated 4–20 mA into 450
Ω
max.
±
0.02 mA
accuracy
• serial interface
1
: isolated
2
RS-485 (refer to RS-485 specifications)
• programmer link: infrared receiver (refer to Programmer specifications on
page 10)
• display (local): backlit, alphanumeric, and multi-graphic liquid crystal for
readout and entry
• HART: optional Profibus PA
Notes:
• Safety feature limits the inrush current during start up.
• This instrument features a universal power supply. AC or DC voltage may be applied
to the same terminals.
• Power consumption will vary according to voltage. Please see Appendix V, Typical
Power Consumption,
on page 107.
1.
This port is used to communicate through Modbus or Dolphin Plus.
2.
Although the RS-485 is isolated, its inputs are electrically clamped to earth ground: see
page 35 for more detail.
SITRANS LR 300.book Page 7 Monday, June 10, 2002 7:18 PM