Acoustic Noise; Safe Stop Of Fc 300; Safe Stop Operation - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

Acoustic Noise

"
The acoustic interference from the adjustable frequency drive comes from three sources:
DC intermediate circuit coils.
1.
Integral fan.
2.
RFI components.
3.
The typical values measured at a distance of 3.3 ft (1 m) from the unit:
FC 301/ FC 302
PK25-P7K5: 200-240 V, 380-500 V, 525-600V
Reduced fan speed
Full fan speed

Safe Stop of FC 300

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The adjustable frequency drive can perform the Designated Safety Function "Uncontrolled Stopping by
removal of power" (as defined by draft IEC 61800-5-2) or Stop Category 0 (as defined in EN 60204-1).
It is designed and approved suitable for the requirements of Safety Category 3 in EN
954-1. This functionality is called Safe Stop.
The Safe Stop function is activated by removing the voltage at Terminal 37 of the Safe Inverter. By connecting
the Safe Inverter to external safety devices providing a safe delay, an installation for a safe Stop Category
1 can be obtained. The safe inverter can be used for asynchronous and synchronous motors.
Safe Stop activation (i.e. removal of 24 V DC voltage supply to terminal 37)
does not provide electrical safety.

Safe Stop Operation

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Activate the Safe Stop function by removing the 24 V DC voltage supply to the terminal 37.
1.
After activation of Safe Stop, the adjustable frequency drive coasts (stops creat-
2.
ing a rotational field in the motor).
The adjustable frequency drive is guaranteed not to restart the motor by an internal
fault (in accordance with Cat. 3 of EN 954-1).
After activation of Safe Stop, the FC 302 display will show the text "Safe Stop active". The associated
help text says "Safe Stop has been activated. To resume normal operation, apply 24 V DC to
terminal 37, then send Reset signal (via Bus, Digital I/O, or the [Reset] key)." This means that the
Safe Stop has been activated, or that normal operation has not been resumed yet after a Safe Stop
activation. NB: The requirements of EN 945-1 Category 3 are only fulfilled while 24 V DC supply
to terminal 37 is removed or below minimum deactivation level (> 5 V DC).
In order to resume operation after activation of Safe Stop, first 24 V DC voltage must be
reapplied to terminal 37 (text "Safe Stop active" is still displayed), second a Reset signal must
be created (via bus, Digital I/O, or [Reset] key on inverter).
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Introduction to FC 300
MG.33.B3.22 - VLT is a registered Danfoss trademark
IP20/IP21/IP4Xtop/Type 1 (NEMA 1)
51 dB(A)
60 dB(A)