Acceleration, deceleration, braking, stopping
AC motor br aking
10
Function library
10.7
10.7.5
L
10.7-8
EDS82EV903-1.0-11/2002
Automatic DC braking (auto DCB)
1. Select the holding time >0.00 s under C0106:
– The automatic DC braking (auto DCB) is active for the time set.
– Afterwards, the controller sets pulse inhibit (display: c).
2. Select the conditions under C0196 for activating the automatic DC braking:
– C0196 = 0: Auto DCB is active when the output frequency is lower than
the operating threshold (C0050 < C0019)
– C0196 = 1: Auto DCB is active when the output frequency is lower than
the operating threshold (C0050 < C0019) and the setpoint is lower than
the operating threshold (setpoint < C0019)
3. Set the threshold under C0019.
)
))
) Note!
Overlong operation of DC braking with high brake current or high
brake voltage can overheat the connected motor!
l Use C0019 to adjust the deadband in the setpoint. If the DC-injection brake
is not to be active, set C0106 = 0.00 s.
l C0019 can be related to a process variable .
10.7.5 AC motor braking
Withthe parameterset changeover in dependence of the DC-busvoltage, the AC
motor braking can be used as alternative for DC braking (DCB). The AC motor
braking is a braking method without external brake resistor for the control mode
“V/f characteristic control with linear characteristic”.
)
))
) Note!
The AC motor braking can only be used with the control mode
“V/f characteristic control with linear characteristic” (C0014 = 2).
l With mains voltages up to approx. AC 400 V shorter braking times can be
reached than with the DC injection braking.
l The braking times for braking via an external brake resistor are approx.
33 % shorter than for AC motor braking.
Automatic activation
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