KCM161FQ
 
 KCM161FQ - INSULATION GUARD FOR IT-NETWORKS WITH FREQUENCY CONVERTERS
  • Designed for non-grounded networks with Frequency Converters
  • Direct connection up to 690V system voltage, up to 1,4kV with HV Adapter
  • Monitoring during both live and standby conditions
  • For use in land, marine and offshore installations
  • Parallelling Disable Function
  • Immune to earth capacitance and voltage surges
  • Analogue output proportional to meter reading
  • Optional slave indicator
  • Scale range: 0-1000kΩ - ∞ (>6MΩ)
Application
The digitally controlled KCM161FQ is designed to monitor the insulation level between a non-grounded (IT) AC mains and its protective earth in systems with frequency converters . The unit is for land, marine and offshore use.

An AC or DC auxiliary voltage is required for the unit, if powered from a separate source the network can also be monitored during inactive (standby) conditions. Only ONE KCM161FQ can be connected to each IT-system. The  ohmmeter and the triple-zone status LEDs give at a glance the clear safety message:
  • ALARM
  • WARNING
  • HEALTHY
General
IDV MEASURING PRINCIPLE
Insulation is measured between the complete galvanically interconnected AC network and its protective earth.

The unit injects a DC measuring signal into the monitored system. The signal flows to ground via the path of the insulation fault, the level of flow indicates the insulation resistance. The measuring accuracy is not influenced by any normal kind of load attached to the AC network.

This unit is used for any land, marine or offshore installations. Start of monitoring function is delayed when auxiliary power is switched on (default 10 secs delay). The unit has minimum of 9 seconds detection time for any insulation fault.

Trip levels and delays are settable on unit rear. A trip LED flashes when the trip level is passed, the relay trips when the delay has elapsed. The timer resets if the fault is removed during countdown.

MEGGER SAFE

When auxiliary power is OFF the unit input is automatically protected against "megger" test voltages up to 1.4kVDC, and incorrect measurements caused by the unit’s input impedance are avoided.

OUTPUTS
The KCM161FQ has an isolated analogue output proportional to meter reading. If output is used for remote meter reading, we recommend 0-1mA for the slave indicator.

SAFETY

When a voltage adapter (CHx) is used the signal to terminals 4 and 6 on KCM161FQ is limited to a safe level, avoiding any dangerous voltage exposure to personnel.

INTELLIGENT SETTING ASSISTANCE
KCM161FQ has a built-in Assistance tool for setting/verification of the trip levels and the analogue output.

When either the Warning or Alarm potmeter on the front is operated by user, the slave meter goes into Assistance Mode and meter reading and analogue output will reflect the potmeter setting.
 
Reset / Parallelling Disable Function
KCM161FQ has a built-in disable function (available only when DC Aux. Supply is applied). When connecting two or more IT-networks together only one unit can be active, the other(s) must be disabled. When unit is disabled the power led will flash every 2 seconds to indicate that unit is inactive.

 
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