The prime purpose of the digitally controlled KPM26x is basically identical to the "traditional" KPM16x Insulation Guard range. An auxiliary Measuring Input Loop Continuity Monitoring Facility has been added to notify the operator if a measuring loop disruption may cause the meter to read a too high insulation level.
An AC or DC auxiliary voltage is required for the unit, if powered from a separate source the network can also be monitored during standby conditions.
The unit has C/O relay outputs for Warning, Alarm and loop failure. The Alarm relay is fail to safety configured. 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. Trip levels and delays are settable on unit rear.
Only ONE KPM26x can be connected to each IT-system. The ohmmeter and the triple-zone status LEDs give at a glance the clear safety message:
IDV MEASURING PRINCIPLE
Insulation is measured between the complete galvanically interconnected AC network and its protective earth. 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, the processing time for KPM26x is approximately 400mS.
MEASURING LOOP ALARM
A sensing resistor is mounted at the furthest end of the monitored loop in a separate
Loop Resistance Sensor Module (LRSM-1,4 or LRSM-5). There are no restrictions on distance from the sensing resistor to the KPM26x unit. There is a fixed delay of 60 seconds on the loop failure alarm.
The Loop alarm will notify the operator by activating LED
LOOP FAILURE and trip relay 3. A disruption in the input measuring loop may cause the guard to falsely read a too high insulation level. The Measuring Input Loop Continuity Monitoring Facility is of special importance during lasting standby conditions (motors, lanterns etc).
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 is avoided.
OUTPUTS
All
F versions have 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 KPM261x and KPM263x is limited to a safe level, avoiding any dangerous voltage exposure to personnel.
The KPM26x range is designed to comply with specification IMCA D 045 "Code of Practice for the Safe Use of Electricity Under Water" issued by IMCA.
The unit meets EN 61010-1 Cat. III, Pollution degree 2 and the relevant environmental and EMC tests specified in EN 61326-2-4 to comply with the requirements of the major Classification Societies.
INTELLIGENT SETTING ASSISTANCE
KPM26x 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 rear is operated by user, the meter goes into Assistance Mode and meter reading and analogue output will reflect the potmeter setting.
