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Siemens Building Technologies
SED2 variable speed drives
CM1U5192en
HVAC Products
Programming
01.2002
4.
Set the alarm delay parameter P2192:
P2192 allows for setting a delay (between 0 to 65 sec) before a warning or error
message is generated. The parameter helps avoid false alarms caused by
temporary transition states. This delay can also be used for belt failure detection
via sensor.
Factory setting: 10 s.
5.
In manual mode, vary the torque frequency in the selected range to check the
function.
6.
Changeover to automatic control.
6.4.3
Belt failure detection with sensor (P0400)
SED2
Fan
51
92
Z
23
en
Sensor
Motor
A simple sensor (inductive sensor) mounted to the drive unit (e.g. 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 the digital input DIN5 of the VSD. The
frequency resulting from the pulse train is compared to the present output frequency of
the VSD.
Parameter P0400 defines the encoder type.
If parameter P0400 = 0 (factory setting), this type of belt failure detection is disabled
and the variant "belt failure detection without sensor (P2182)“ is used instead.
Only digital input DIN5 works with a counter signal!
1.
Determine the speed transformation ratio between the motor and the shaft driven
by the belt.
2.
Define the encoder type using parameter P0400.
Possible settings for P0400:
0
Disabled (factory setting).
1
Single channel encoder.
2
Quadrature encoder without zero pulse.
3
External pulse train.
12
Quadrature encoder with zero pulse.
3.
Use parameter P0409 to set the pulse rate (number of pulses/sec) generated by
the sensor at nominal frequency (nominal speed) by including the transmission
ratio determined in point 1.
Setting range:
1 to 500
Factory setting:
25
Note
.
.
.
.
Parameterizing belt
failure detection with
sensor
(commissioning)
