CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE Instrukcja Użytkownika Pobierz pdf (Strona 3)

CARLO GAVAZZI Automation Components. Specifications are subject to change without notice. Illustrations are for example only.

How to increase the lifetime of the motor

DMPU allows to protect the motor

against damage due to thermal effects

taking place in overload conditions.

The protection function trips when

motor heating, i.e. the heat quantity in

the motor, (represented by the TCU

parameter-Thermal Capacity Used)

reaches 100% of the maximum one for

that specific motor. This is calculated

starting from the motor plate

parameters and the electrical variables

measurs to estimate how long an

overload condition can be sustained

before motor overheats and fails. The

user can also monitor the motor

temperature, through PT100 or PTC

probes, and warn or trip if the

temperature is too high.

How to monitor energy consumption

The measurement module measures all

the instantaneous electric variables as

voltages, currents, harmonic distortions,

power factors, active, reactive and

apparent powers, and the respective

energies. Each of these variables can be

monitored to signal (for instance to the

supervision system, or in the worst cases

stopping the motor) a potentially

dangerous situation.

How to prevent the malfunction or trip for failure

DMPU implements several ANSI (American

National Standard Institute) functions to

protect the motor from operations that may

damage it. They are the most used for high-

end motor protection.

For example:

•Monitors motor inverse current (current

imbalance) which is one of the main

causes of motor heating (ANSI 46).

•Prevents the locked or stalled rotor

conditions (ANSI 51 LR and ANSI 48).

•Estimates earth fault current from the

vector sum of the currents (ANSI 64) and

monitors the earth leakage current through

a core balance transformer (ANSI 64 EL).

•Monitors the number of starts per hour or

the time since previous start or stop to limit

overheating caused by frequent restarts

(ANSI 66).

100

1 10 100

L/L

Time [s]

1 2 3 4 5 6 7 8

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CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE Instrukcja Użytkownika Strona 3

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