Thermal Motor Monitoring - Lenze 9300 vector Série Instructions De Montage

2.2

Thermal motor monitoring

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Note!
From software version 8.1 onwards, the 9300 vector controllers are provided
with an I
motor.
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Die I x t load of the motor is displayed in C0066.
The thermal loading capacity of the motor is expressed by the thermal motor time
constant (t, C0128). Find the value in the rated motor data or contact the manufacturer of
the motor.
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The I x t monitoring has been designed such that it will be activated after 179 s in the
event of a motor with a thermal motor time constant of 5 minutes (Lenze setting C0128),
a motor current of 1.5 x I
Two adjustable trigger thresholds provide for different responses.
Adjustable response OC8 (TRIP, warning, off).
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– The trigger threshold is set in C0127.
– The response is set in C0606.
– The response OC8, for instance, can be used for an advance warning.
Fixed response OC6−TRIP.
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– The trigger threshold is set in C0120.
Behaviour of the I
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The I x t monitoring is deactivated.
C0066 is set = 0 % and
MCTRL−LOAD−I2XT is set = 0.00 %.
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I x t monitoring is stopped.
The current value in C0066 and at the
MCTRL−LOAD−I2XT output is frozen.
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I x t monitoring is deactivated.
The motor load is displayed in C0066.
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Note!
An error message OC6 or OC8 can only be reset if the I
set trigger threshold by 5 %.
EDKVF9333V DE/EN/FR 7.2
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xt function for sensorless thermal monitoring of the connected
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I xt monitoring is based on a mathematical model which calculates a
thermal motor utilisation from the detected motor currents.
The calculated motor utilisation is saved when the mains is switched off.
The function is UL−certified, i.e. additional protective measures for the motor
are not required in UL−approved systems.
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Nevertheless, I xt monitoring does not provide full motor protection
because other influences on the motor utilisation such as changes in the
cooling conditions (e.g. cooling air flow interrupted or too warm) cannot be
detected.
and a trigger threshold of 100 %.
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x t monitoring
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Safety instructions
Thermal motor monitoring
Condition
When C0120 = 0 % and C0127 = 0 %, set controller
inhibit.
When C0120 = 0 % and C0127 = 0 %, set controller
enable.
Set C0606 = 3 (off) and C0127 > 0 %.
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x t load falls below the
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