- Sensors
- Temperature monitor TW 50/60
- Temperature monitor TW 03 S – Type 8432
- Electronic temperature monitor – Type 8433
- PT100 thermo sensor – Type 8433
- Electronic thermostat – Type 8434
- PT100 thermosensor – Type 8434
- Electronic thermostat in cable form – Type 8434
- PT100 thermosensor 2-wire and 3-wire cable connection – Type 8434
- Non-contact magnetic switch – Type 8441
- Current sensor – Type 8442
- Non-contact overhead wire contact TLC 4 – Type 8474
- Precipitation sensor – Type 8921
- Precipitation sensor – Type 8921
- Potential monitoring/-protection
- Mobile adjustment and test device – Type 8204
- Potential monitoring devices
- Display unit – Type 8540
- Voltage Monitors
- Voltage Signal Relays
- Potential Protection Devices
- for floating grounds with voltage monitoring – Type 8900
- for floating grounds with voltage monitoring – Type 8900
- for floating grounds with current control – Type 8901
- with low voltage limiter, surge arrester current monitoring and remote clearing function – Type 8901
- with SIEMENS low voltage limiter and surge arrester – Type 8901
- for open earthing with current monitoring and remote clearing – Type 8901
- for floating grounds with current control and LED indicator – Type 8901
- Voltage fuse – Type 8961
- Voltage Limiting Device – Type 8962
- Over Voltage Protector Type PSNP – Type 8963
- R/C combination – Type 8970
- Earthing device – Type 8971
- Special relays
- Switching amplifier
- Temperature monitoring – Type 8435-PT100
- Evaluation unit – Type KAG2
- Evaluation unit – Type 8480
- Evaluation unit – Type KAV1
- Switching amplifier – Type 8582
- Switching amplifier – Type 8582DCW
- Isolating switching amplifier – Type 8583
- Switching amplifier – Type 8586
- Mobile Test Device for non-contact overhead contact line switch
- Cable Monitoring Devices
- Points Heating Systems
- Current Monitoring/-supply
- Cabinets
- Accessories
- Individual Solutions
Description
The 8546-VL current monitor works with 24V DV and measures the magnetic field around a conductor (e.g. a power rail).
The 8546-VL is designed to monitor a voltage limiter (VL). A program specially adapted for the VL serves to monitor it and to provide error reports.
The polarity of the DC-current does not affect this.
Special technology means that the device remains functional even with strong magnetic fields (e.g. lightning strikes), despite its high responsiveness. The switching threshold of the device (sensitivity) can be set with a potentiometer. If the switching threshold is exceeded by the current, a digital switching output (positive switching around 24V DC) is triggered.
As a basic principle, the device operates with a storing output (latch), i.e. exceeding the threshold once leads to permanent setting of the output. The device is reset by means of a 24V DC reset input. If this input is connected permanently to 24V DC, the latch function is suspended and the output of the device follows the measurement current.
A test button allows the sensitivity of the device to be increased by a factor of 3. This can be used for adjustment to a current that is smaller by this factor.
The operation of the switch output is „low active“, i.e. if the device has not exceeded its threshold value, the output is at 24V DC. If the threshold value is exceeded, the output is drawn towards GND. A line break in the downstream analysis is therefore treated in exactly the same way as an overcurrent.
The status of the device is shown by two LEDs:
- green LED: ready for operation
- yellow LED: check RVL
The output is set if the pre-set current is exceeded three times within 60 mins. or if the pre-set current flows for longer than 60 mins.
The output is automatically reset after 8 hours or by means of a reset pulse applied to input (2).
Do you have any questions?
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