Commissioning
7.2 Setpoint values for monitoring the bearing temperature
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
94
Operating Instructions, 06/2018, A5E44455710A
7.2
Setpoint values for monitoring the bearing temperature
Prior to commissioning
If the machine is equipped with bearing thermometers, set the temperature value for
disconnection on the monitoring equipment before the first machine run.
Table 7- 2
Set values for monitoring the bearing temperatures before commissioning
Set value
Temperature
Alarm
115 °C
Shutting down
120 °C
Normal operation
Determine the maximum operating temperature of the bearings T
operation
taking into account
the temperature, bearing load and influences of the plant on the motor in °C. Set the values
for shutdown and warning corresponding to the operating temperature T
op
.
Table 7- 3
Set values for monitoring the bearing temperatures
Set value
Temperature
Alarm
T
operation
+ 5
K ≤
115 °C
Shutting down
T
operation
+ 10
K ≤
120 °C
7.3
Switching on
Measures for start-up
After installation or inspections, the following measures are recommended for normal start-
up of the machines:
●
Start the machine without a load. To do this, close the circuit breaker and do not switch
the machine off prematurely. Switching the machine off again while it is starting up and
still running at slow speed should be kept to a bare minimum, for example for checking
the direction of rotation or for checking in general. Allow the machine to run to a standstill
before switching it back on again.
●
Check mechanical operation for noise or vibration at the bearings or end shields.
●
If the machine is not running smoothly or is emitting abnormal noises, switch it off, and
determine the cause of the fault as it runs down.
●
If mechanical operation improves immediately after the machine is switched off, then the
cause is magnetic or electrical, e.g. voltage imbalance, magnetic imbalance. If
mechanical operation does not improve immediately after switching the machine off, then
the cause is mechanical, e.g. an imbalance in the electrical machines or in the driven
