KEB COMBIVERT F4-C Applications Manual

7
ANTRIEBSTECHNIK
6
97
KEB COMBIVERT F4-C
Name: Basis
29.01.98
6
ANTRIEBSTECHNIK
Section
Page
Date
© KEB Antriebstechnik, 1997
All Rights reserved
Chapter
Functional DescriptionSpecial Functions
Generatoric Operation
Fig. 6.9.3.a Triggering of the Power-Off Function
6.9.3 Power-Off Function
It is the task of the Power-Off function (e.g. in case of power failure) to ensure a
controlled deceleration of the drive until standstill. The kinetic energy of the rotating
drive is used to support the inverter intermediate circuit voltage. Thus the inverter
remains in operation and the drive is decelerated in a controlled manner.
Especially for parallel running drives (e.g. in textile machines) the uncontrolled coasting
of the motors and the consequences resulting from it (thread breakage etc.) are
avoided.
Fig. 6.9.3.b Frequency jump for generatoric operation
Pn.17 determines how the Power-Off function if triggered. Is Pn.18 = „0“ and Pn.42
= „199“ then the starting voltage is also the setpoint value for the DC-link control.
With activated Power-Off function this setting leads to an immediate restart upon
voltage recovery. All other settings result in a deceleration to standstill.
198 Power-Off Function deactivated
199 At automatic starting voltage the intermediate circuit voltage is measured
in different operating conditions. The actual starting voltage is determined
by Pn.33, which adjusts the starting voltage proportional to the measured
value (see next page).
200...800 Manual adjustment of the starting voltage in volt. To ensure a save
operation the adjusted starting voltage must be at least 50V above the
UP level (UP: 400V-class = 360V; 200V-class = 210 V DC).
Starting Voltage
(Pn.17)
The thus adjusted starting voltage is now continuously compared with the DC-link
actual value. If the actual value falls below the setpoint value, the Power-Off function
is activated.
First of all the drive must be put into generatoric operation so that the energy can be
fed back into the intermediate circuit. This happens by making a frequency jump, so
that the speed of the drive is larger than the output rotary field speed of the inverter.
In order for a correct automatic calculation it is a must to enter the motor data in the
dr-parameters first.
Enter motor data in the
dr-Parameters !
Triggering of Power-Off
Function
Auto DC-link set value
measured at "noP", "LS"
and constant operation
DC-link actual
value
Start from power-Off when
actual value < set value
+
-
Pn.17 Starting voltage
Function off (198)
Automatic (199)
Setting 200...800V
Pn.33 Power-Off-Mode
Bit 0+1Autom. tripping level
0 = 0 % (no Function)
1 = 80%
2 = 85%
3 = 90%
Automatic DC-
link set value
Slip calculation
Active current (Iw)
Load (Is)
Frequency jump after triggering
Power-Off function
Motor must go into generatorie
operation
Pn.38 Jumpfaktor
0...255%
Default value 100%
Pn.33 Power-Off-Mode
Bit 2 Starting jump
from slip = Value 0
from load = Value 4
Enter motor
data in

KEB COMBIVERT F4-C Specifications

General

Brand	KEB
Model	COMBIVERT F4-C
Category	DC Drives
Language	English