Insulation AC Transducers
Analog Panel Meter
Boiler Level Control
Current & Power Guards & Controllers
Dewpoint & Hygrometers
Digital Panel Meter
Digital Power/Multi-Function Meter
Earth Fault Monitoring & Protection
Fire Pump Controllers
Frequency & Voltage Guards
Gas Warning Systems
Generator Protection & Controllers
Industrial Communication & Converter
Loss of Mains Protection
Power & Test Equipment
Process Signal Transmitter
Protector Trip Relay
The digitally controlled MCM16x 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 MCM16x can be connected to each IT-system. The optional slave indicator give at a glance the clear safety message:
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.
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.
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.
When a voltage adapter (CHx, ANx or ARx) is used the signal to terminals 4 and 6 on MCM163x and MCM165x is limited to a safe level, avoiding any dangerous voltage exposure to personnel.
The Ultra-Reliability Concept (Paralleling of Transducers)
To obtain ultimate operational safety multiple MCM16x 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.