Ip
[A]
– Ic
[A]
T
[s]
= 10,34
[s]
log
e
Ip
[A]
– I
lim
[A]
7
peak current
continuous current
max. continuous admissible current
The continuous current limit, I
lim
, is set according to the specific application. From the above
figure one can deduce that for t < t
1
, the motor is fed by a current less than the current limit.
In the deceleration phase (interval t
1
, t
2
), the current assumes the value I
p1
> l
lim
.
The presence of the limiter allows the power rating to be exceeded without any risk to the
motor. The maximum overload period of the motor T[s] depends directly on the peak current
value and on the actual current before the overload:
In the event of an overload period longer than the maximum T period, the servo amplifier will
impose the current I
lim
which will continue for the duration of the overload (e.g.: interval [t
4,
t
5
]).
N.B.:
When the limiter is active, the servo amplifier has no control on the motor speed.
7.4 Enable
The servo amplifier is disabled when contacts 7 and 11 are connected (high level).
Opening this connection (low level) enables the power stage. This input is for contact
closures only (e.g.: relay contacts).
7.5 Motor-Speed Monitor
The Motor-Speed Monitor (contact 15 of the connector), generates a voltage proportional
to the actual motor speed.
7.6 High PWM frequency
The high PWM frequency of 150 kHz allows the servo amplifier to exploit the technical
characteristics of brushless DC-servomotors to the utmost.
Ip
=
Ic
=
I
lim
=
General characteristics
Specifications subject to change without notice
Summary of Contents for BLD 5606 Series
Page 30: ...28 Notes...
Page 31: ...29 Notes...
