External Motor Overload Protection; Control Terminals - Siemens sed2 Commissioning Manual

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.
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
Location of the control
terminals
Access to the control
terminals: Frame sizes
A ...C
Access to the control ter-
minals: Frame sizes
D...F, IP20
22/80
Siemens Building Technologies
HVAC Products
14
SED2
Control
terminals
15
5192Z11en
Use only shielded cables for control cables.
Route control cables in separate cable trunks at least 20 cm away from motor and
power cables.
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.
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.
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.
Commissioning Guide
5 Electrical installation
14
Klixon
N.C.
SED2
control
terminals
1 kΩ
15
CM1G5192en
26.02.2003