Instruction Manual ZHK
V07-21.0
87/140
Alternative to PTC: Motors with integrated bimetal sensor (thermal contact, Clixon) - op-
tional
Bimetal detectors are used for thermal monitoring of motor windings and consist of two successive
rolled metals, with unequal thermal expansion coefficients. When they are heated, they expand un-
evenly and can switch a contact. They have the advantage that they can be placed directly on the
switch and so no special relay (as for PTC) is needed.
Block diagram for connection: refer to
Figure 184:
Wiring diagram for thermal contacts
ETA - AHU
These AHUs are as, standard equipped, with a circuit protection switch and frequency converters,
if not equipped with EC motors. When the motor is equipped with a PTC, it is connected to fre-
quency converter to monitor the temperature.
Motor connection
The three-phase motor must be connected, depending on the used supply voltage and according
to the information on the rating plate (see
) and in the terminal box (see
) of
the motor.
Figure 185:
Motor rating plate
Figure 186:
Motor terminal box
Cable type for motor connection
The motor can be powered directly or via a frequency converter. A shielded cable must be used for
the motor cable and the shield must be grounded on both ends (frequency converter / main switch
& motor).
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