BONFIGLIOLI active cube 201 User Manual

238
Operating Instructions ACU
12/16
CAUTION
The resistance of the brake resistor must not be less than the minimum value R
b min
-
10%. The values for R
b min
are listed in chapter 5 "5".
If the calculated resistance R
b
of the brake resistor is between two standard series values, the lower
resistance is to be selected.
 Calculation of On Time OT
Z
b
t
t
ED 
OT
=
On Time
t
b
=
Braking time
t
Z
=
Cycle time
t
spiel
t
b
Example:
t
b
= 48 s, t
Z
= 120 s
%404,0
t
t
ED
Z
b

In the case of infrequent short braking operations, typical values of the On Time OT are at 10 %, for
long braking operations ( 120 s) typical values are at 100%. In the case of frequent deceleration
and acceleration operations, it is recommended that the On Time OT be calculated according to the
above formula.
The calculated values for P
b Peak
, R
b
and OT can be used by the resistor manufacturers for
determining the resistor-specific permanent power.
19.5 Motor circuit breaker
In order to protect the motor against excessive heat-up, monitoring mechanisms are required which
will identify potential thermal overloading in due time to prevent the motor from damage. The
thermal condition of a motor can be identified in different ways.
1. Direct monitoring via temperature sensors in the winding (see Chapter 19.5.1 "19.5.1")
 PTC
 KTY
 PT1000
 Thermocontact
2. Indirect monitoring of motor temperature
 Monitoring of motor current using the K- characteristic of an integrated motor circuit breaker
 Thermocontact
 Modeling of motor heat-up by consideration of temperature-relevant factors via a
mathematical model I
2
t
The thermal monitoring method is selected based on the type and operating conditions of the motor.
Generally, any of the available methods is sufficient for reliable motor protection. A combination of
methods from both groups (one from each group) and parallel execution is possible.
19.5.1 Motor circuit breaker
Motor circuit breakers are used for protecting a motor and its supply cable against overheating by
overload. Depending on the overload level, they disconnect the motor from power supply
immediately in the case of a short-circuit or they disconnect the motor if an overload has occurred
for some time.

BONFIGLIOLI active cube 201 Specifications

General

Brand	BONFIGLIOLI
Model	active cube 201
Category	DC Drives
Language	English