Operating Instructions

Chapter 6 – Programming
Siemens Building Technologies, Inc. 59
Belt Failure Detection with Sensor (P0400)
SED2
Ventilator
5192Z23de
Sensor
Motor
Figure 34. Belt Failure Detection with Sensor (P0400).
A simple sensor (inductive sensor) mounted to the drive unit (such as for a fan) supplies one
pulse for each rotation. The pulse train generated this way, which can vary from 1 to 20,000
pulses per minute, is sent to SED2 digital input DIN5. The frequency resulting from the pulse
train is compared to the present output frequency of the SED2.
Select Encoder Type parameter P0400 defines the encoder type. If parameter P0400 is set
to 0 (factory setting) so belt failure detection is disabled, belt failure detection without sensor
(P2181) is used instead.
Only DIN5 works with a counter signal.
Parameter Settings for Belt Failure Detection with Sensor (Commissioning)
Determine the speed transformation ratio between the motor and the shaft driven by the belt.
P0400, Encoder type
Define the encoder type using parameter P0400. Possible settings:
0 Disabled (factory setting).
1 Single channel encoder.
2 Quadrature encoder without zero pulse.
3 External pulse train.
12 Quadrature encoder with zero pulse.
P0409, Pulses per Second at Rated Frequency
Use parameter P0409 to set the pulse rate (number of pulses/seconds) generated by the
sensor at nominal frequency (nominal speed) by including the determined transmission ratio.
Setting range: 1 to 500
Factory setting: 25