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Siemens Building Technologies SED2 variable speed drives CM1U5192en
HVAC Products Programming 01.2002
4. Set the desired reaction of drive belt failure detection via parameter P2181.
Possible settings for P2181:
0 Belt failure detection disabled (factory setting).
1 Warn low torque/speed.
2 Warn high torque/speed.
3 Warn high/low torque/speed.
4 Trip low torque/speed.
5 Trip high torque/speed.
6 Trip high/low torque/speed.
Suggested setting: 1 Warn low torque/speed.
5. Use parameter P2191 to set the maximum permissible deviation of the pulse
train frequency (actual value) generated by the sensor from the VSD output
frequency (setpoint). If the tolerance band for frequency is exceeded, a warning or
trip is generated.
Setting range: 0 to 20 Hz.
Factory setting: 3 Hz.
6. In manual mode, vary the torque frequency in the selected range to check the
function.
7. Changeover to automatic control.
6.4.4 Staging pumps or fans
The motor control staging allows to control up to two additional pumps or fans based on
the integrated PID control system. The complete system comprises a pump (fan)
controlled by the VSD, and up to two additional pumps (fans) switched by contactors or
motor starters. The contactors or motor starters are controlled by relay switching
contacts integrated in the VSD. The diagram below shows a typical pump system. A
similar system comprising fans could be used for ventilating systems.
MV M1 M2
Pressure sensor
to PID input of
variable speed drive
Motor starterVariable
speed drive
Mains voltage
5192Z24en
MV: Motor, speed-controlled by SED2.
M1: Motor, controlled by relay 1 DOUT1.
M2: Motor, controlled by relay 2 DOUT2.
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