76
Stop signal
Output freq.
Output volt.
Output current
t1 t2
time
2%
DC brakin
fre
.
DC brakin
volt.
time
time
t1=H17
t2=H18
The hoist decelerates down to the DC
Braking Frequency level first before DC
Braking. Drive stops producing any Output
voltage for t1. Drive will produce the DC
braking voltage for t2.
5.3.6 DC Braking
H15: DC Braking Frequency (Factory Default: 5.0 Hz.)
Range:0.0 - 20.0 Hz
H16: DC Braking Voltage (Factory Default: 5%)
Range:0 - 20 %
H17: DC Braking Block Time (Factory Default: 0.5 sec.)
Range:0.0 - 5.0 sec.
H18: DC Braking Time (Factory Default: 2.0 sec.)
Range:0.0 - 20.0 sec.
This function can be used to bring the hoist to a quick stop without the use of
Dynamic Braking Resistors. H15 sets the starting frequency where the DC Injection
begins. H17 is the time between the DC Injection command and the actual desired
moment of DC injection output. H18 is the total braking time.
H16 is the level of DC Injection Voltage Output (% of rated voltage). The DC
Injection Braking can be selected by selecting DC Brake in F21. This method can
also be used to build up magnetic flux in the hoist motor for smooth starting motion.
See Fig. 5.3.7.
Fig. 5.3.7: DC injection Braking
Stop Signal
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