4 Product description
SAFEONE DN3PD2 Manual 10
4 Product description
The SAFEONE DN3PD2 is a safety switchgear for sensorless speed monitoring of electric
drives.
The readiness for operation and the switching status of the contact outputs are displayed
via LEDs.
The device has a standard USB connection. The configuration software GO:BEYOND
enables a simple parameterization and online monitoring.
The device is intended for mounting on a 35mm standard rail.
4.1 Function description
The two-channel evaluation unit of the safety switchgear module measures the frequen-
cy of the effective rotating field of the motor at the measuring terminals U, V, W.
After applying the operating voltage (24 V DC) to terminals A1 and A2, the safety relay
will operate a self-test. The safety relay is in safe condition for the duration of the self-
test. The LED OK lights up red.
The device is ready for operation, when the LED OK lights up green.
If the parameterized switching threshold frequencies are exceeded or undershot (fmin
and fmax), or an internal or external fault exists, the enabling current paths 13/14, 23/24
open immediately. The device is in safe switching state.
4.1.1 Speed monitoring
The parameters fmax (maximum frequency) and fmin (minimum frequency) define the speed
limits of the motor. The limit frequencies fmax and fmin are calculated from the speed n and the
number of pole pairs:
f [Hz]= (n [U/min] / 60) x number of pole pairs
Example: 5000 rev /min x 3 (number of pole pairs) / 60 = 250Hz
Asynchronous motors have a load-dependent slip between the motor speed and the rotating
field frequency. This must be observed by the configuration of the switching threshold (fmin and
fmax).
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