Inspection and maintenance • Motor bearing and holding brake
94
8JSA user's manual V1.00
Warning!
Risk of burns due to hot surfaces!
Touching hot surfaces (e.g. motor and gearbox housings, as well as connected components), can lead
to very severe burns due to the very high temperature of these parts.
•
Do not stay in the danger zone during operation and secure it against access by unauthorized
persons.
•
Never touch the motor or gearbox housing as well as adjacent surfaces during nominal load
operation.
•
Be aware of hot surfaces also during downtime.
•
Allow motor and gearbox to cool sufficiently before working on it. This is because there is still
a risk of burning for a prolonged period of time even after shutting down.
•
Always operate the motor or gearbox with all safety devices. Do this even during short testing
and trial operations!
2 Motor bearing and holding brake
Motor bearing
In the case of trouble-free operation, we recommend changing the motor bearing after approx. 20,000 operating
hours as a general maintenance guideline (calculated bearing mission time L
h10
: 20,000 operating hours).
Holding brake
Over time, exposure to moisture and contamination can reduce the braking torque. The application should therefore
check the braking torque from time to time using the brake test function with the safety factor required for the
application.
If the brake is no longer achieving the necessary torque, a refresh cycle can help it achieve the necessary torque
again.
•
The brake test function in the ACOPOS servo drive used must be enabled.
•
During a refresh cycle, the motor is allowed to turn one revolution at a speed of 50 rpm with the brake
engaged. This cleans the brake pads and generally helps the brake to once again achieve the torque it
needs.
•
After the refresh cycle, the brake should be tested again.
•
If the brake is still not achieving the necessary torque after 5 refresh cycles, the motor must be replaced.
Replace the motor when the brake no longer reaches its required torque.
If necessary, contact B&R. Repairs to the motor and brake are only permitted to be carried out by B&R!
Note:
The motors can be equipped with an optional holding brake. It is used to hold the motor shaft when no
power is applied to the motor. The maximum motor torque far exceeds the holding torque of the brake.
Danger!
Personal injury and damage to property due to non-intended use of the holding brake!
If the holding brake is used differently than intended, functional failures and accidents involving per-
sonal injury or damage to property are possible.
•
Do not use the holding brake for braking under normal operating conditions! It is not intended
for normal braking.
•
Do not use the holding brake to protect personnel! The holding brake does not provide protec-
tion for personnel!
•
Do not use the holding brake to hold loads! They do not ensure a securing function (e.g. against
lowering in the case of lifted loads).
•
Do not load motors with holding brakes axially either during assembly or during operation. It is
especially important to prevent axial forces in the direction of the B flange since these forces
can cause the brake to fail!