940 HEIDENHAIN Technical Manual MANUALplus 620
Summary:
• The speed is switched at the intersection of the two current curves
(Imax of motor, Imax of power module) so that no inconsistencies in the
torque behavior of the motor occur.
• For better controllability (no harmonics at higher PWM frequencies), it
might already make sense to switch at lower speeds.
• The best speed to switch at must be determined by experimenting. The
value above should serve as an initial value.
Overcurrent
switch-off
The momentary current is monitored by the CC, and the following errors now
lead to an immediate cutoff:
Excessive actual current: If the actual current exceeds the maximum
permissible current (depending on the power module and motor), it triggers
the error 0xC3C0 (Motor current too high).
Excessive current offset: If the offset current exceeds the permissible
threshold (50 % of the maximum current), the error 0xC600 (Current offset
too high) is triggered. One possible reason could be a phase to ground fault.
MP_motSpeedSwitchOver
Shaft speed for PWM switchover
Available from NCK software version: 597 110-03.
Format: Numerical value
Input: 0 to 100 000 [rpm]
Specifies the shaft speed at which the PWM frequency is
switched to twice the PWM frequency. Use only in combination
with HEIDENHAIN power modules!
Function only available in combination with CC 6106 or CC 424.
Default: No value, parameter optional
Access: LEVEL3
Reaction: RESET
MP_motSpeedSwitchBack
Shaft speed for PWM switchover
Available from NCK software version: 597 110-03.
Format: Numerical value
Input: 0 to 100 000 [rpm]
Specifies the shaft speed at which the factor 2 PWM frequency
is switched to a factor 1. Use only in combination with
HEIDENHAIN power modules!
Function only available in combination with CC 6106 or CC 424.
Default: No value, parameter optional
Access: LEVEL3
Reaction: RESET
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