7. Commissioning
• DOK-CONTRL-DDC+MDD+DLC-ANW1-EN-E1,44 • 01.97
64
Continuous standstill
torque
The servo motor can output a continuous standstill torque during continuous
operations
• of up to 25 % of nmax (maximum NC usable speed) and
• up to an ambient temprature of 45˚C.
In accordance with the thermal time constant, the motor housing will achieve
a temperature of 60K. To accomodate higher rpms, see the relevant motor
operating curve for the continuous torque.
7.5.
Error Reaction
The drive response in the event of a drive error can be set with digital drive
controllers. Three responses are possible.
Possible error
reactions with drive
errors
• Braking at maximum torque with automatic powering down - Error reac-
tion 1
• Braking at maximum torque without automatic powering down - Error
reaction 2
• Torque disconnect without automatic power disconnect - Error reaction 3
Error reaction selection
Fig 7.1: Drive reactions with drive errors
Caution
Error
reaction
Drive reaction with a drive error
0
• Braking at maximum torque
• Torque disconnect of drive after 500 ms
• Automatic power disconnect
• Ready to operate Bb (X8 - 7/8) opens
• Holding brake applied at n > 10min
-1
but no more than 400 ms
1
• Braking at maximum torque
• Torque disconnect of drive after 500 ms
• No automatic power disconnect
• Ready to operate Bb (X8 - 7/8) opens
• Holding brake applied at n > 10min
-1
but no more than 400 ms
2
• Drive immediately goes torque-free
• No automatic power disconnect
• Ready to operate Bb (X8-7/8) opens
• Holding brake applied immediately
Source of danger:
The holding brake wears down after 20,000 revolu-
tions against the closed holding brake.
Possible consequences:
Machine could be damaged.
How to avoid:
Do not set in motors with holding brake error reac-
tion 2.