Technical data
Page 40
4.4.1
Current derating
In deviation from the technical motor data, the item Servo Positioning Controller C 3-Series have current derating during
nominal operation. The rated current and the duration of the maximum permissible peak current of the servo positioning
controller depend on several factors.
These factors are:
Output current level (the higher the output current is, the shorter the permissible time will be)
Clock frequency of the power output stage (the higher the clock frequency is, the shorter the permissible time will be)
Electrical rotational frequency of the motor (speed multiplied by the number of pole pairs) (the higher the rotational
frequency is, the longer the permissible time will be)
The following applies to the last point (electrical rotational frequency): For the sake of clarity, a distinction is made only
between electrical rotational frequencies below 5 Hz and those above 20 Hz. In the case of rotational frequencies between
these two values, interpolation is required. This leads to two tables: the first one applies to motors at a standstill or to slow-
running motors (electrical rotational frequency
≤
5 Hz) and the second one applies to fast-running motors (electrical rotational
frequency
≥
20 Hz).
Note: The heat sink turn-off temperature is 70°C. The servo positioning controller will be switched off when
the temperature reaches or exceeds this value. It will not be ready for operation until after a brief cooling
period.
Table 14:
Controller C 3-05: rated current values for a blocked or slow-running motor
(f
el
)
≤
5Hz and for an ambient temperature
≤
40°C
Parameter
Values
Power output stage clock frequency (kHz)
≤
12.5
Nominal current (A
RMS
)
5
Max. output current (A
RMS
)
10
15
20
Max. permissible time (s)
5
0.8
0.1
Power output stage clock frequency (kHz)
16
Nominal current (A
RMS
)
2.5
Max. output current (A
RMS
)
5
7.5
10
Max. permissible time (s)
5
1.2
0.15
Table 15:
Controller C 3-05: rated current values for a rotating motor (f
el
)
≥
20 Hz and for an ambient temperature
≤
40°C
Parameter
Values
Power output stage clock frequency (kHz)
≤
12.5
