Emotron AB 01-3694-01r2 Applications 33
6. Applications
This chapter contains tables giving an overview of many dif-
ferent applications/duties in which it is suitable to use varia-
ble speed drives from Emotron. Further on you will find
application examples of the most common applications and
solutions.
6.1 Application overview
6.1.1Pumps
6.1.2Fans
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High start currents require larger fuses and cables.
Cause stress on equipment and higher energy cost.
Torque control reduces start current. Same fuses
can be used as those required for the motor.
331–336, 351
Dry-running, cavitation and overheating damage
the pump and cause downtime.
Pump Curve Protection detects deviation. Sends
warning or activates safety stop.
411–419, 41C– 1C9
Sludge sticks to impeller when pump has been run-
ning at low speed or been stationary for a while.
Reduces the pump’s efficiency.
Automatic pump rinsing function: pump is set to
run at full speed at certain intervals, then return
to normal speed.
362–368, 560, 640
Motor runs at same speed despite varying
demands in pressure/flow. Energy is lost and
equipment stressed.
PID continuously adapts pressure/flow to the
level required. Sleep function activated when
none is needed.
320, 380, 342, 354
Process inefficiency due to e.g. a blocked pipe, a
valve not fully opened or a worn impeller.
Pump Curve Protection detects deviation. Warn-
ing is sent or safety stop activated.
411–419, 41C–41C9
Water hammer damages the pump when stopped.
Mechanical stress on pipes, valves, gaskets, seals.
Smooth linear stops protect the equipment. Elimi-
nates need for costly motorized valves.
331–336
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High start currents require larger fuses and cables.
Cause stress on equipment and higher energy cost.
Torque control reduces start current. Same fuses
can be used as those required for the motor.
331–336, 351
Starting a fan rotating in the wrong direction can be
critical, e.g. a tunnel fan in event of a fire.
Fan is started at low speed to ensure correct
direction and proper function.
219, 341
Draft causes turned off fan to rotate the wrong way.
Starting causes high current peaks and mechanical
stress.
Motor is gradually slowed to complete stop before
starting. Avoids blown fuses and breakdown.
219, 33A, 335
Regulating pressure/flow with dampers causes
high energy consumption and equipment wear.
Automatic regulation of pressure/flow with motor
speed gives more exact control.
321, 354
Motor runs at same speed despite varying
demands in pressure/flow. Energy is lost and
equipment stressed.
PID continuously adapts to the level required.
Sleep function is activated when none is needed.
320, 380, 342, 354
Process inefficiency due to e.g. a blocked filter, a
damper not fully opened or a worn belt.
Load Curve Protection detects deviation. Warning
is sent or safety stop activated.
411–419, 41C–41C9
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