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User manual SID116 – 09.04.2015r. v.1.0 page 35
User can configure II and III sector by setting motor voltage supply and supply voltage at driver settings. Other
sectors are a result of driver construction.
5.7.2
Braking resistor. Parameters selection.
Driver has build-in cement resistor with resistance 10 Ω and rated power 10 W. SID116-PC software provides
configuration of power and resistance of braking resistor.
Picture. 29. Braking resistor
Default parameters are consonant with settings of internal resistor. Driver based on this parameters and
measured voltage determines maximal braking power. While resistor configuration please pay attention to
settings of motor rated voltage and driver voltage supply. Set motor rated voltage can’t be higher than driver set
voltage supply. Set driver voltage supply must be lower than maximal existing voltage of supply source. In other
case driver will lose excessive voltage in resistor.
Example:
Supply driver from storage battery with 24 V rated voltage,
charging voltage of such accumulator is
usually higher and can have
about 28 V. Voltage of charged storage battery will be higher than 24 V. So if we will
set 24 V driver voltage supply, driver after exceeding 24 V will activate braking resistor which will try to decrease
voltage to 24 V level, irrespective of the fact drive is active or not which means that storage battery will be
discharged to 24 V level. That’s why driver voltage supply at settings should be set to maximal value, which at this
example is 28 V.
The same concerns power supply units, which have voltage pulsation on output. Then please
measure real voltage supply or give it with 10 % reserve.
Resistor rated power at application is a constant power at while resistor can safely operate for 30 min. When
resistor is build-in there is an option to overload it 10 times, under condition that overloading time do not exceed
5 seconds and average power at cyclic overloading will not exceed rated 10 W. It means that in application can be
entered max 100 W value for internal resistor, under condition that drive braking will take no longer than 5
seconds and braking time won’t exceed 10 % of driver operation cycle.
When resistor power is too low driver will turn into safety mode (error: voltage supply >36 V) due to voltage
induced by braking/returning motor. It is necessary to use external braking resistor. Resistor connection is
presented at
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chapter. External braking resistor is connected parallel
with external resistor and controlled from the same transistor. It means that while braking both resistors will
conduct current according to Ohm law. Power stored on individual resistor will depend on its resistance, so
resistance of external resistor should be lower than internal resistor.
