Commissioning
5.6 Function commissioning
SINAMICS V20 Inverter
94 Operating Instructions, 07/2012, A5E03728167
5.6.3.9 Running the inverter in frost protection mode
Functionality
If the ambient temperature falls below a given threshold, motor turns automatically to prevent
freezing.
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● OFF1 / OFF3: The frost protection function is disabled when OFF3 is activated and
enabled again when OFF1 is activated.
● OFF2 / fault: The motor stops and the frost protection is deactivated.
Setting parameters
Parameter Function Setting
P3852[0...2] BI: Enable frost protection This parameter defines command source of protection enable
command. If binary input is equal to one, then protection will
be initiated (factory default: 0).
If P3853 ≠ 0, frost protection is applied by applying the given
frequency to the motor.
Note that the protection function may be overridden under the
following circumstances:
• If inverter is running and protection signal becomes active,
signal is ignored
• If inverter is turning motor due to active protection signal
and a RUN command is received, RUN command
overrides frost signal
• Issuing an OFF command while protection is active will
stop the motor
P3853[0...2] Frost protection frequency [Hz] This parameter specifies the frequency applied to the motor
when frost protection is active.
Range: 0.00 ... 599.00 (factory default: 5.00)
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