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Page 7.13 - 18 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Protective functions
7.13.3.2 Overvoltage error (E.OP)
The error overvoltage occurs mostly at high speed. By activation of Pn.01 "automatic restart E.OP", it can be
avoided that the drive "spins down" for a long time after this error. This function makes sense only in combina-
tion with the speed search (see chapter 7.15).
The base-block time (bbL) is at least 1 second, even if the value in uF.12"base-block time" is smaller. Further-
more, the base-block time before the restart is always observed, even if uF.13 "motor de-excitation lower limit"
is undershot.
7.13.3.3 Overcurrent error (E.OC)
The automatic restart after occurence of an overcurrent error is activated with Pn.02 "automatic restart E.OC". It
can be used if impact overloads of the FI, e.g. due to blocking of the motor, can be expected in v/f-characteristic
operation.
The base-block time is treated as in overvoltage errors.
After 10 restart attempts, the inverter state must be unequal to the base-block time or the overcurrent error for
at least one second, otherwise the restart is aborted.
7.13.3.4 Malfunction messages and pre-warnings
A malfunction response with automatic restart is selected in parameters Pn.03, Pn.05, Pn.07, Pn.08, Pn.10,
Pn.12, Pn.14, Pn.16, Pn.18, Pn.66, Pn.75 and Pn.81 with the values3...5.
The base-block time is observed only if the drive is above uF.13 "motor de-excitation lower limit".
7.13.4 Base block
After shutdown of the modulation (e.g., when opening the control release or if an error occurs), one must wait
for the time shown in uF.12 "base-block time" before the modulation can be switched on again. During this pha-
se, ru.00 displays the status "motor de-excitation" and the display shows "bbL", respectively.
If ru.42 "modulation grade" is below uF.13 "base block voltage level" when switching off the modulation, there
is no base-block time. Even at low frequencies, the base-block time is not observed.
Exception: After overvoltage- or overcurrent-error, a minimum base-block time of 1s is inserted.
The parameters uF.12 and uF.13 are dependent on the power circuit and serve only as information for the user
on which minimum switch-off times to expect in the application.
In parameter Pn.65 / bit 8 "256: bbL is not displayed", the status message "motor de-excitation" can be sup-
pressed so that the event caused by the modulation switch-off becomes visible immediately.
7.13.5 Fast stop
The abnormal stopping-function serves to shut down the drive (mostly in case of a malfunction) as quickly as
possible. Therefore, there is a separate ramp time (Pn.60: "Quick stop deceleration time") and, in closed-loop
operation separate torque limits (Pn.61: "Quick stop torque limit", Pn.67: „Quick stop maximum torque corner
speed“), which can be adjusted highter than the torque limits for normal operation, to provide the required fast
deceleration.
In v/f-characteristic operation, one can choose in Pn.58 "quick stop mode" between ramp generator and diffe-
rential controller. For the differential controller, the time constant is set in Pn.60. The setpoint of the differential
controller is preset in Pn.59: "quick stop level", Pn.58 selects the actual value from either apparent current or
active current.
The abnormal stopping can be activated by malfunction as well as via the control word (Sy.50 Bit 8). The func-
tionality is the same in both cases, but for state "79: abnormal stopping" (StOP) is always displayed.
For all modes, one can choose whether the abnormal stopping-bit is reset in the status word (Sy.51 or Sy.44 Bit