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Siemens Building Technologies Commissioning Guide CM1G5192en
HVAC Products 5 Electrical installation 26.02.2003
5.3.3 External motor overload protection
During operation below nominal speed, the cooling effect of the fan fitted to the motor shaft is reduced. For this
reason, most motors require derating if operated continuously at low frequencies. To ensure that motors are pro-
tected from overheating under these conditions, they must have a built-in PTC temperature sensor or a Klixon
thermal switch which is to be connected to the VSD control terminals 14 and 15 according to the diagrams shown
here.
14
15
SED2
Control
terminals
5192Z11en
15
1 k
Ω
Klixon
N.C.
14
5192Z11en
SED2
control
terminals
Note: To enable the switch-off function with a PTC thermistor, set parameter P0601 to 1.
Use a shielded cable to connect the PTC thermistor.
5.4 Control terminals
General information
Use only shielded cables for control cables.
Route control cables in separate cable trunks at least 20 cm away from motor and
power cables.
Location of the control
terminals
The control terminals are located on the I/O module. The I/O module is identical for
all models. It is located under the operator panel.
Access to the control
terminals: Frame sizes
A …C
To access the control terminals, remove first the relevant terminal covers.
For frame size A, see section “Access to connection terminals: Frame size A”
on page 14.
For frame sizes B and C, see “Access to connection terminals: Frame sizes B and
C” on page 14.
Access to the control ter-
minals: Frame sizes
D…F, IP20
To access the control terminals, remove the operator panel, the I/O module, and
the I/O module terminal cover plate.
See section “Access to connection terminals: Frame sizes D…F IP20” on page 15.
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