Operating Instructions

Chapter 6 – Programming
Siemens Building Technologies, Inc. 57
Belt Failure Detection without Sensor (P2181)
SED2
5192Z22en
Fan
Motor
Figure 32. Belt Failure Detection without Sensor (P2181).
This function allows for monitoring power transmission components such as drive belts. The
function can also detect motor overload, such as in the case of a jam.
The actual frequency/torque curve is compared to a preprogrammed tolerance band (see
P2182 through P2190 in the Appendix A: Parameter Reference List of this document) as part
of this function. If the actual curve is outside the tolerance band, a warning or error message
(F0085) occurs.
Torque [Nm]
Frequency [Hz]
Threshold frequency 1 Threshold frequency 3
Threshold frequency 2
P2182 P2184
P2183
P2189
Upper torque threshold 3
P2190 unterer
Lower torque threshold 3
P2187
Upper torque threshold 2
P2188
Lower torque threshold 2
P2185
Upper torque threshold 1
P2186
Lower torque threshold 1
5192D01en
Figure 33. Frequency/Torque Curve.
The zone that is shaded gray shows the permissible frequency/torque area. The frequency
limit values 1 to 3 define the areas used to compare the actual torque to the preset torque.
Nine parameters define torque monitoring. Belt Threshold Frequency 1-3 parameters P2182
through P2184 define the frequency limit values to be set. Upper and Lower Torque
Threshold 1-3 parameters P2185 through P2190 limit the tolerance band compared to the
present torque curve.