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Accessories<br />
<strong>BM</strong> 4", 6" <strong>and</strong> 8"<br />
Control functions<br />
This table describes the protection provided by MP 204.<br />
Control parameters Function Problem Advantages<br />
Temperature<br />
Overvoltage/<br />
undervoltage<br />
Overload<br />
Underload<br />
(dry running)<br />
Current unbalance<br />
Phase sequence<br />
Missing phase<br />
MS<br />
The motor temperature is measured by<br />
means of the built-in Tempcon temperature<br />
transmitter <strong>and</strong> a signal is sent to MP 204 via<br />
the phase leads. In MP 204 the measured<br />
temperature is compared with the factory-set<br />
value (75°C).<br />
MMS<br />
The motor temperature is measured by<br />
means of the Pt100. The signal is sent to the<br />
MP 204 where the measured temperature is<br />
compared with the factory-set value. Temperature<br />
protection requires a submersible<br />
motor with a Pt100.<br />
The motor temperature must be monitored<br />
during frequency converter operation.<br />
If the set trip value is exceeded, the motor<br />
will stop.<br />
The motor power input is measured on each<br />
of the three phases. The registered power input<br />
is an average of these three values. If the<br />
factory-set value is exceeded, the motor will<br />
stop.<br />
The motor power input is measured on each<br />
of the three phases. The registered power input<br />
is an average of these three values. If the<br />
average value is lower than the factory-setting<br />
value, the motor will stop.<br />
The power input of the motor is measured on<br />
each of the three phases.<br />
MP 204 <strong>and</strong> motor are installed so that the<br />
phase sequence corresponds to correct direction<br />
of rotation. MP 204 monitors changes<br />
in the phase sequences.<br />
MP 204 checks the phases connected, missing<br />
phase will cause an alarm.<br />
Overload, frequent starts/<br />
stops, operation against<br />
blocked discharge pipe,<br />
insufficient flow velocity<br />
past the motor.<br />
The installation is close to<br />
a transformer. The mains<br />
do not absorb load variations.<br />
Incorrect sizing of pump/<br />
motor, voltage supply failure,<br />
defective cable,<br />
blocking, wear or corrosion.<br />
Pump exposed to dry running<br />
or underload, for example<br />
caused by wear.<br />
Mains load is uneven, incipient<br />
motor defect,<br />
phase voltages diverging.<br />
Two phases are wrongly<br />
connected.<br />
Missing phase<br />
Longer motor life,<br />
safe operating conditions,<br />
service indication.<br />
Important installation<br />
parameter, possibility<br />
of improving operating<br />
conditions.<br />
Longer pump life,<br />
safe operating conditions,<br />
service indication.<br />
Traditional dry-running<br />
protection is no<br />
longer necessary, no<br />
extra cables.<br />
Motor protection<br />
against overload,<br />
service indication.<br />
Ensures correct<br />
pump performance.<br />
Indication of missing<br />
phase, <strong>and</strong><br />
alarm.<br />
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