Lenze 931E/K Small Drives Control - Manual (Page 122)

Troubleshooting and fault elimination
Error monitorings in the 931E/K
Monitoring the DC−bus voltage
9
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122 SW−HB 13.0002−EN 4.1
9.1.2 Monitoring the DC−bus voltage
ƒ Overvoltage monitoring:
The overvoltage monitoring for the DC bus will respond if the DC−bus voltage exceeds
the operating voltage range. After this, the power stage will be switched off.
ƒ Undervoltage monitoring: The undervoltage monitoring will respond if the DC−bus
voltage falls below the lower voltage threshold, see the chapter "DC−bus
monitoring". (
¶ 143)
The response to this error can be parameterised for applications that require "no−load
traversing" of the DC bus or machine set−up with a reduced DC−bus voltage.
9.1.3 Monitoring the logic supply
ƒ 24 V over/undervoltage monitoring:
The logic supply of the 931E/K servo positioning controller is monitored. When the
logic supply is too high or too low, an error message will be activated.
ƒ Internal operating voltages:
All internal operating voltages such as the 3.3 V supply for the processor are monitored.
9.1.4 Monitoring the heatsink temperature
ƒ Temperature derating:
With high temperatures, the permissible maximum current will be derated to ensure
a long service life of the 931E/K servo positioning controller.
ƒ Switch−off in the event of overtemperature:
A linear temperature sensor is used to measure the heatsink temperature of the power
stage. When the temperature limit is reached, an error message will be activated. In
addition, approx. 5
°C below the limit value, a temperature warning will be activated.