VLT ® 2900 Series -500 - +500% of rated slip compensation 0.5 - 132.0/1000.0 Hz 100% 3.0 Hz Slip compensation is calculated automatically, on the basis of such data as the rated motor speed n M,N . In this parameter, the slip compensation can be fine- tuned, thereby compensating for tolerances on the value for n M,N . Slip compensation is only active if a selection has been made of Speedregulation, open loop [0] in parameter 100 Configuration and Constant torque [1] in parameter 101 Torque characteristic .
Here you can select the frequency at which the exter- nal brake is activated; this takes place via the output defined in parameter 323 Relay output 1-3 or 341 Dig- ital output terminal 46 . Set the required frequency. Key in a % value. 0 % - 100 % of inverter output current This is where the user selects the minimum motor cur- rent running for the mechanical brake to be released. Current monitoring is only active from stop until the point when the brake is released. 0 % 0 - 100% of max. DC hold voltage 0% This parameter is used to keep the motor (holding tor- que) at start/stop.
Programming This is an extra safety precaution, aimed at guaran- teeing that the load is not lost during start of a lifting/ lowering operation. This parameter can only be used if a selection has been made of DC hold in parameter 121 Start func- tion or 122 Function at stop . To be set as a percentage value of the max. DC hold voltage, which depends on the choice of motor. 0.000 - XXX,XXX Ω Depends on choice of mo- tor X L is sum of rotor and stator leakage reactance. 0.5 - 132.0/1000.0 Hz 3.0 Hz After setting of parameters 102-106 Nameplate data , a number of adjustments of various parameter is made automatically, including the leakage reactance X L .
The shaft performance can be improved by fine-tuning the leakage reactance X L . Here you can select the frequency at which the exter- nal brake is released, via the output defined in param- eter 323 Relay output 1-3 or 341 Digital output, terminal 46 . Set the required frequency. NB! Parameter 142 The leakage reactance X L is normally not to be changed if the name- plate data have been set, parameters 102-106. = factory setting, () = display text, [] = value for use in communication via serial communication port MG.29.A3.02 - VLT ® is a registered Danfoss trademark 27 136 Slip compensation (SLIP COMP.) Value: 139 Brake cut in frequency (Brake cut in) Value: Function: Function:
Description of choice: Description of choice: 140 Current, minimum value (CURRENT MIN VAL) Value: 137 DC hold voltage (DC HOLD VOLTAGE) Value: Function: Function: Description of choice: Description of choice: 142 Leakage reactance XL (LEAK. REACTANCE) Value: 138 Brake cut out value (Brake cut out) Value: Function: Function: Description of choice: