4 Product description
SAFEONE DN3PD2 Manual 11
Monitoring of a speed range without startup monitoring
fmin: minimum frequency
If fmin is undershot, the output contacts (13-14 / 23-24) switch off.
They switch on again after the acknowledgment via the acknowledgment input Q.
Depending on the acknowledgment mode, the switch-on-conditions differ. Please note the
chapter "Startup monitoring". If fmin = 0 there is no monitoring to a minimum speed. The output
contacts remain closed at standstill.
fmax: maximum frequency
If fmax is exceeded, the output contacts (13-14 / 23-24) switch off.
They switch on again after the acknowledgment via the acknowledgment input Q, if fmax (minus
hysteresis) is undershot.
CAUTION
Note that a coasting motor is detected either as a standstill (if fmin = 0, no switch-off)
or underrun (if fmin> 0, switch-off).
4.2 Acknowledge function
The acknowledgment function allows the module to be reset to operational readiness after a
shutdown due to under- or overspeed. The reset takes place via the input Q at the module, if
none of the mentioned states is pre-sent.
Automatic or manual acknowledgment is possible. With automatic acknowledgment, the Q input
must always be connected to 24V DC.
A manual acknowledgment takes place after a falling signal edge at the input Q (tQ ≥ 200ms
and ≤ 10s).
4.3 Start-up monitoring
The startup monitoring time tA is a time limit within which the actual speed must be greater than
fmin. If the minimum speed is not reached during this time, the enable current path opens
again.
The start-up monitoring time is parameterized (0s to 60s). It is not retriggerable, it cannot be
restarted while it is running.
The start-up monitoring time starts
In case of manual acknowledgment: with the falling edge of the acknowledge signal
In case of automatic acknowledgment: if the actual speed is> 1Hz
In the acknowledgment mode without startup monitoring (0s), the outputs only switch on within
the permitted range.
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