KEB COMBIVERT F5 MULTI Applications Manual page 257

Special Functions
Functional sequence F5-M
Bridging of mains gaps
Emergency stop with braking
module
Function description F5-S
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the active current control are lowered linearly with the output frequency.
If Power-Off is switched on (Pn.44 Bit 0 = 1), it becomes active when the DC-link
voltage drops below the starting voltage. The behaviour depends on the adjustment of
the setpoint source (Pn.44 Bit 6-7). The behaviour setpoint source = voltage source
(on.44 Bit 6-7 = 1 or 2) is the same as with voltage setpoint = starting voltage (Pn.44
Bit 6-7 = 0). .
For F5-M only the parameters Pn.44..46, Pn.48, Pn.51, Pn.52 and Pn.57 are visible.
In Pn.44 the Bits 2 and 8 are ineffective.
The Power-Off function is switched off in controlled operation (cs.0 Bit 0..2 = 0..3).
Set value source:
Starting voltage (Pn.44 Bit 6-7 = 0)
In this mode the motor shall be operated almost in no-load operation and only recover
the energy which the inverter requires for the operation. The starting voltage is also
the setpoint value of the DC-link voltage controller. The value of manipulated variable
represents the torque limit of the speed controller.
In case of weak supply systems it is recommended to choose the automatic starting
voltage, as in this case the starting voltage value is adapted to slow voltage fluctuations.
In the first cycle the limit of the speed control is adjusted to the measured slip, so that
the drive is put into no-load operation.
Restart at power recovery
Only in this mode the system recovery can be constantly detected. An immediate
restart upon system recovery is possible. After detecting the system recovery the
restart delay (Pn.52) runs and the drive accelerates to the current setpoint.
An immediate restart is not executed below the restart value (Pn.48). The drive
decelerates with the quick-stop function Pn.60..61 (see Chapt. 6.7.7) and behaves
then in accordance with the setting in Pn.44 Bit 3-4.
Set value source:
Braking torque Pn.47 (Pn.44 Bit 6-7 = 3)
In this mode the drive is to be stopped as fast as possible. As the refed energy can be
very high, a braking resistor is necessary.
The DC-link voltage controller is not active. The drive decelerates with the quick-stop
function Pn.60..61 (see Chapt. 6.7.7) and behaves then in accordance with the setting
in Pn.44 Bit 3-4.
If Power-Off is switched on (Pn.44 Bit 0 = 1) it becomes active when the DC-link
voltage drops below the starting voltage. The drive decelerates with the quick-stop
function Pn.60..61 and behaves then in accordance with the setting in Pn.44 Bit 3-4.
For F5-S only the parameters Pn.44..46 and Pn.52 are visible. At Pn.44 only the Bits
0, 1, and 3..4 are active.
Name: Basis
KEB COMBIVERT F5
Functional Description
Date
04.05.04
Chapter Section Page
6 9 25
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