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9.12.9
Setting Boost value
The boost function is an automatic voltage increase when the control system is under dynamic
requirements. When using the square characteristic curve, the output voltage is increased dispropor-
tionately to the frequency during a 20% increase of the modulation. That results in more torque on the
motor so the current does not increase so strongly during accelerations. Just before reaching the
modulation default value, the motor voltage that corresponds to the square characteristic curve is
restored. The boost mode is only used during suf
fi
ciently large modulation increases (starting from ca.
20 %).
Boost Value
You can determine the amount of voltage increase via the percentage setting. 15 %
boost value increase voltage by 15 % over normal value of the square characteristic
curve.
Setting range: 0...25.0 %
Factory setting: 15.0 %
9.12.10
Setting Quench mode
If, under certain circumstances, the modulation switches back on while the motor is still rotating fast,
this can result in a re-supply of the inverter
’
s
“
overcurrent disconnection
”
.
The quench modus is available to prevent this from happening (
“
quench
”
= synchronizing the rotating
magnetic
fi
eld generated by the frequency inverter with the momentary speed of the triggered motor).
If this function is activated, the frequency inverter
’
s rotating magnetic-
fi
eld speed is synchronized with
the motor
’
s
fi
eld at the start of every triggering (nominal value and modulation must have been
„
0
“
beforehand). Switchover into
“
normal mode
”
is automatic after the synchronization is completed.
Attention!
Due to the transient motor triggering with maximum frequency at reduced output voltage necessary for
the quench mode, short-term start-up can occur in a stationary motor with low centrifugal force.
The quench function can be combined with motor braking (DC brake mode). However, running both
functions successively increases the time span until the motor is reaccelerated. For normal use, it is
recommended to use only the quench mode.
Quench mode
Selection of function for Quench mode
ON
= Ouench mode ON (factory setting)
OFF
= Ouench mode OFF
E1 Actual
Active Quench mode is signaled by a bright triangle in the display.
Operating Instructions
Icontrol
–
model series FXDM
Programming
L-BAL-E036-GB 1422 Index 008
Part.-No. 00154773-GB
70/96