MCM161x Series
 
MCM161x - INSULATION TRANSDUCER FOR NON-GROUNDED AC NETWORKS
  • Direct connection up to 690V line voltage for both single or three phase systems
  • Monitoring during both live and standby conditions
  • For use in land, marine, offshore, sub-sea and ocean floor Installations
  • Complies with IMCA D 045 Code of Practice
  • "Megger" - safe to 1,4kVDC when aux power is OFF
  • Immune to earth capacitance and voltage surges
  • Analogue output proportional to meter reading
  • Optional slave indicator
Application
The digitally controlled MCM161x series monitors insulation level between a non-grounded (IT) AC mains and its protective earth, regardless of whether the mains is live or non-live (standby).

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. Only ONE MCM161x can be connected to each IT-system.

The optional slave indicator 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 sequentially coded 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.
 
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 unit is supplied with an isolated analogue output proportional to insulation level. If output is used for remote meter reading, we recommend 0-1mA for the slave indicator.

SAFETY
The MCM161x 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 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.

The Ultra-Reliability Concept (Paralleling of Transducers)
To obtain ultimate operational safety multiple MCM161x transducer inputs and outputs can be permanently paralleled.

At any time only ONE transducer should be enabled. The selected transducer is activated by applying auxiliary power to unit. Accidental enabling of more than one transducer will give distorted reading, but will not harm the transducer.

NOTE
Special versions of the MCM161x are available as:
 
MCM161xM
Insulation Transducer with DC detection function, protected against high-energy DC voltage imposed on the monitored AC supply.
 
MCM261x
Insulation Transducer with measuring loop continuity monitoring.
 
MCM161F
Scale range: 0-1000kΩ - ∞ (>6MΩ)
This unit is used for hospital, industrial, marine and offshore installations.

Start of monitoring function is delayed when auxiliary power is switched on (default 5 secs delay).

Direct connection up to 690V line voltage.

 
 
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