Descriptions of functions
10.20 Thermal overload protection for the DC motor (I2t monitoring of the motor)
SINAMICS DCM DC Converter
582
Operating Instructions, 12/2018, A5E34763375A
Monitoring the fan lifetime
The planned lifetime for each fan is set at p50961[0...4]; the factory setting is 30000 hours.
Alarm A60165 is output 500 hours before the planned lifetime is reached. It is recommended
that the corresponding fan is replaced at the next opportunity when the system is not
operational (scheduled downtime).
If the lifetime for a fan is set to zero (p50961[0...4] = 0.0 hours), then the fan lifetime
monitoring for this fan is disabled.
The corresponding operating hours counter is reset to 0 by setting parameter p50962[0..4]
to 1. This should be done each time that a fan is replaced!
See also the SINAMICS DCM List Manual, function diagram 8045.
The instructions on how to replace a fan are provided in Chapter "Replacing the fan
(Page 692)".
10.20
Thermal overload protection for the DC motor (I
2
t monitoring of the
motor)
I
2
t monitoring protects the motor against impermissible loads.
NOTICE
No full motor protection
I
2
t monitoring only provides an approximate representation of the motor's thermal image.
In the factory setting, when switching off the drive, the calculated temperature is saved in a
non-volatile fashion; when the drive is switched on again, the saved value is taken into
account when continuing to calculate the temperature.
This response can be adapted using p50140.
When p50114 = 0, I
2
t monitoring is disabled.
Note
•
Please observe the manufacturer's specifications if you are using other motor types.
•
If you are using DC motors 1G.5/1H.5 as per Catalog DA12, p50113 must be set to 1.00.
