Current Monitoring; Frequency Monitoring; 808 Monitoring Current A; Fin - BONFIGLIOLI ACTIVE Applications Manual

4.2.1
The monitoring of the motor current supplements the functionality for the activation of
a holding brake. Applications demanding a holding brake accelerate the motor by the
specific load behavior when the brake is opened.
The asynchronous motor must be supplied with sufficient current in all operation
points in order to provide the necessary torque to avoid damage to property and per-
sons. Possible reasons for a lack of torque on the motor shaft can be a defective mo-
tor, a lack of or incorrect motor connection, a defect in the frequency inverter or
wrong parameterization. This is why the output current is monitored. If the absolute
value of the output current drops below the set threshold
the fault "F1310 minimum current monitoring" is triggered. In the event of a fault, the
holding brake is closed and the safety switch opened by the frequency inverter or an
external monitoring
4.2.2
The output frequency of the frequency inverter and the rotary frequency of the motor
shaft vary as a function of the load point. The selected control functions and methods
contain an estimate of the load point and thus the slip speed or a precise measure-
ment thanks to a speed sensor feedback. The standstill of the drive can thus be de-
termined precisely or also only estimated.
Reliable activation of the holding brake thus demands a
relative to the
holding brake is measured.
12
12

Current monitoring

Parameter
No. Description
808 Monitoring current

Frequency monitoring

Maximum frequency
Parameter
No. Description
809 Frequency threshold
Min.
0.0 A
419, from which the time t
Min.
0.0 %
Monitoring current
808,
Setting
Max. Fact. sett.
o⋅I 0.2 ⋅ I

FIN

R
Frequency threshold
809
for the closing of the
13
Setting
Max. Fact. sett.
100.0% 1.0 %
06/05
06/05