Subject to change without notification
Subject to change without notification
3.9 Overcurrent Limit
The MCBL 05002 continuously monitors the total current via the power electronics section and
the drive. If the measured value crosses a presettable level, the following countermeasures are
put into effect to return the current to a safe level:
1. The output voltage will be reduced by steps, until the overcurrent level is within the limit
or until the value of the output voltage reaches zero.
2. If the current is still too high, it is because a high rotational speed has been defined and
a high level of compensating voltage is being generated. In this event, the set speed will be
reduced to 0 rpm. It will now generate no voltage at all, either as output voltage or back-EMF
compensating voltage.
Summary:
In the event of overcurrent, the output voltage will be reduced in steps, and then
the speed will be reduced to zero. This condition will be maintained until the user resets the
overcurrent bit.
An overcurrent fault will be indicated by a bit in the fault register:
gfs
returns the third bit
from the right as 1. As long as this bit in the fault register is set to 1, the output voltage
will be reduced and cannot be raised by altering the Output Voltage Potentiometer.
The output voltage, however, may be lowered via the potentiometer while in this state.
The overcurrent bit is released by the following actions:
1. The output voltage is reduced to 0V via the Output Voltage Potentiometer.
2. The two commands
di
and
en
(in this order) switch the drive off and then on again.
3. By pressing the Start/Stop button. Naturally this must be in the active state.
27
Befehl
Funktion Beschreibung
lpc
Limit Peak Current Set the desired peak current value [mA]
gpc
Get Limit of Peak Display the value of the current limit [mA]
Current
gfs
Get Fault Status Feed back the status of the fault output:
0 = no fault, 1 = fault
From left to right:
Bit 3 -
Bit 2 Current limit
Bit 1: -
Bit 0: -
