2-158 Stop Modes
Stop Modes [Stop Mode A, B]
[DC Brake Lvl Sel]
[DC Brake Level]
[DC Brake Time]
1. Coast to Stop - When in Coast to Stop, the drive acknowledges the Stop
command by shutting off the output transistors and releasing control of
the motor. The load / motor will coats or free spin until the mechanical
energy is dissipated.
2. Dynamic Braking is explained in detail in the PowerFlex Dynamic
Braking Selection Guide, presented in
Appendix A.
3. Brake to Stop is selected by setting [Stop Mode A] to a value of “3.”
The User can also select the amount of time the braking will be applied
and the magnitude of the current used for braking with [DC Brake Time]
and [DC Brake Level]. This mode of braking will generate up to 40% of
rated motor torque for braking and is typically used for low inertia loads.
When in Brake to Stop, the drive acknowledges the Stop command by
immediately stopping the output and then applying a programmable DC
voltage [DC Brake Level] to 1 phase of the motor. This voltage is only
removed by one of two events;
– Opening an Enable digital input
– Reissuing the Start command
Caution must be used when setting [DC Brake Level]. Excess motor
current could damage the motor.
Caution must also be observed, since motor voltage will exist even
though a Stop command was issued.
Coast Time is load dependent
Stop
Command
Time
Output Voltage
Output Current
Motor Speed
Stop
Command
DC Hold Time
Time
Output Voltage
Output Current
Motor Speed
DC
Hold Level
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