TDE MACNO MINIOPD EXP, Руководство пользователя, Страница: 43 / 124

43
User’s manual
Internal value d28 and analog output 28 display a second-by-second reading of the motor thermal
current as a percentage of the rated motor current. When 100% is reached, the motor thermal switch
cuts in.
P96
can be set with an alarm threshold which, when breached, commutes logic output
o.L.14
to a
high level indicating the approximation to the motor thermal limit.
The maximum motor thermal current depends on the operating frequency, provided that the motor
does not have assisted ventilation regardless of its revolutions.
Four permitted thermal current curves are used to reduce the current in accordance with motor
operating frequency (see diagram); the required curve is chosen with Connection C33 as per the
table.
flav/fnm [%]
Itermica /
Inominale [%]
100
50
70 100 120
Curve 0
Curve 1
Curve 2
Curve 3
C33 Characteristics
0
No reduction according to frequency; to be chosen for
assisted ventilation motors
1
Choose for self-ventilated high speed motors (2 poles) where
ventilation is more efficient. There is no current reduction for
frequencies over 70% of the rated frequency
2 [default] Typical curve for self-ventilated motors
3 Curve for motors that heat up excessively with curve 2
The drive can manage the motor thermal probe. For the correct wiring of the probe, make reference
to the installation manual.
The connection C46 selects the type of probe used:
C46 Description Visualizationin d26
0 No motor thermal protection enabled
1
PTC management
: The thermal resistance is measured and
compared to the maximum setup in the parameter
P95
, If the
temperature exceeds the threshold, the
A5
alarm starts.
Thermal probe resistance in
Ω
(D41)
2
NTC management
: The thermal resistance is measured and
compared to the minimum setup in the parameter
P95
, If the
value is below, the
A5
alarm starts.
Thermal probe resistance in
Ω
(D41)
3
Termo-switch management: it’s possible to configure a
logic input to I23 function, in this case if this input goes
to a low level the A5 alarm starts
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4 KTY84 Motor temperature (D26)