Manual

0098441113480, V2.00, 03.2011
SD315O 5 Commissioning
Drive for stepper motors 55
5.2.3 Setting the current reduction
If the full holding torque is not required at standstill, the "Current Reduc-
tion" function can be used to reduce the holding torque.
Current reduction saves energy and reduces the temperature of the
drive and the motor.
The motor phase current is reduced to the set value 100 ms after the last
pulse edge. The set value relates to the set nominal current of the motor.
왘 Switch off all supply voltages. Verify that no voltages are present
(safety instructions).
왘 Use parameters switches S2.1 to S2.3 to set the current reduction.
NOTE: If the nominal current of the motor is >7.5 A, you must set a
value of ≤67 % for the current reduction.
Figure 5.2 Current reduction to the set value
@ WARNING
FALLING LOAD AT STANDSTILL
If the current reduction is enabled, the motor torque at standstill is re-
duced; if external forces act on the drive (vertical axes), this may
cause the load to fall.
• Verify that the load conditions allow for operation with current
reduction.
• If necessary, deactivate the current reduction.
Failure to follow these instructions can result in death, serious
injury or equipment damage.
1432
87%
37%
100%
50%12%
75%67%
25%
CurRed2
CurRed1
CurRed0
S2
ON
OFF
1432
1432
OFF OFFOFF
1432 1432 1432
1432 1432 1432
OFF
ON