Application
The digitally controlled KPM169 monitors insulation between a non-grounded (IT) battery or live DC network and its protective earth.
Only ONE KPM169 can be connected to the same IT-system. An AC or DC auxiliary voltage is required for the unit. A green LED indicates AUX POWER on. Start of monitoring function is delayed when auxiliary power is switched on (default 2 secs delay). In this way false tripping during power up, caused by initial charging of network spread capacitance, is avoided The DIN96 front-of-panel mounted instrument reads the insulation level directly in Ω. The meter has reflectionfree glass. The ohmmeter and the triple-zone status LEDs at a glance gives the clear safety message:
The unit meets IEC60092-504 and the relevant environmental and EMC
tests specified in IEC60068/60092 and IEC61000/60533 respectively, to
comply with the requirements of the major Classification Societies.
Description
SEV MEASURING PRINCIPLE
Insulation is measured between the complete galvanically interconnected DC network and its protective earth. The unit extracts a sequentially coded measuring signal from the monitored network. The signal flows to ground via the path of the insulation fault, the level of flow expresses the insulation resistance, the direction of flow expresses the fault polarity. The measuring accuracy is not influenced by any normal kind of load attached to the network.
POLARITY INDICATION
The Neg Polarity LED indicates the polarity of the insulation level at any time shown on the meter. If the LED is not lit, the meter reads leakage level from the positive pole. If the LED is lit blue, the meter reads leakage from the negative pole.
"PATHFINDER" FUNCTION
During a Warning or Alarm condition the Polarity LED indicates the polarity causing the trip:
- POSITIVE: LED not lit
- NEGATIVE: blue LED lit
RELAY OUTPUTS
The unit has non-latching C/O relay outputs for Warning (R1), Alarm (R2) and System Error (R3). The Alarm relay is fail to safety configured. A trip LED flashes when the trip level is passed, the relay trips after elapsed delay. The timer resets if the fault is removed during countdown. Trip levels and delays are settable on unit rear. Recommended trip level settings will depend on application and priority of safety hazards.
ANALOGUE OUTPUT
KPM169F and KPM169L have an isolated analogue output proportional to meter reading.
SYSTEM SUPERVISION
If voltage of the monitored DC system not connected to the unit input or is the input voltage too low, the NEG POLARITY LED will flash red, and relay 3 (System Error) will trip. If polarity of the input connection reversed, the NEG POLARITY LED will flash red and blue, and relay 3 will trip. Trip of relay 3 will inhibit operation of the warning and alarm relay and their respective trip LEDs.
KPM169E and KPM169F scale range is
0 - 100kΩ independent of system voltage.
KPM169K and KPM169L scale range is 10kΩ - 5MΩ independent of system voltage, and unit must be connected to the DC system via the appropriate Voltage Adapter RH2 (60 to 200V), RH4 (200 to 400V) or RH8 (400 to 800V). The Voltage Adapter also protects personnel from exposure to dangerous DC voltage levels.
