VEGA VEGASEL 643 - Manual (Page 4)

4 VEGASEL 643
Product description
1.3 Types and versions
VEGASEL 643
Two-point auxiliary level switch with selectable mode; mode A (overfill
protection) or mode B (protection against dry running of pumps)
adjustable switching hysteresis
Inputs:
- passive current input 0/4 … 20 mA
- active current input (connections of a sensor
4 … 20 mA)
- passive voltage input 0/2 … 10 V
Outputs: 1 relay (spdt)
Approvals: as part of an overfill protection acc. to WHG and
VbF
Application: level detection, overfill protection,
protection against dry running of pumps
off
on
Level
Time t
Fig. 1.2 Two-point auxiliary level switch
VEGASEL 643
Min.
Max.
1.4 Technical data and dimensions
General data
Power supply
Operating voltage 20 … 250 V AC, 50/60 Hz
20 … 72 V DC
Power consumption max. 1,7 W (4,5 VA)
Fuse T 1 A, 250 V
Measuring data inputs
Input 1
1 current input
Kind of input active two-wire input analog
Range 4 … 20 mA
Application connection of sensors (4 … 20 mA)
Sensor supply voltage 16 … 24 V DC
Switching threshold adjustable via coded key
Min. hysteresis 1 %
Current limitation appr. 25 mA, permanently shortcircuit proof
Temperature error 0,05 %/10 K of range
Switch point error 0,5 % of adjusted switch point
Connection cable 2 wire (standard line)
Resistor per conductor max. 35 Ω
Interlock diode for connection of a measuring instrument
max. load 15
Ω
Input 2
1 additional current input
Kind of input passive two-wire input analog
Range 0/4 … 20 mA
Inner resistor Ri = 50 Ω
Application direct connection to active current output of e.g.
VEGAMET 601, 602 Ex
Switching threshold adjustable via coded key
Min. hysteresis 1 %
Temperature error 0,05 %/10 K of range
Switch point error 0,5 % of adjusted switch point