Thermal Motor Monitoring; Description - Lenze EVS9321 Montageanleitung

2.2

Thermal motor monitoring

2.2.1

Description

)
Note!
From software version 8.0 onwards, the 9300 controllers are provided with an
2
I xt function for sensorless thermal monitoring of the connected motor.
ƒ
ƒ
ƒ
ƒ
2
The I × t−load of the motor is constantly calculated by the drive controller and displayed
in C0066.
2
The I x t−monitoring is designed in a way, that a motor with a thermal motor time factor
of 5 min, a motor current of 1.5 x I
monitoring after 179 s.
You can set different reactions with two adjustable trigger thresholds.
Adjustable reaction OC8 (TRIP, Warning, Off).
ƒ
– The reaction is set in C0606.
– The trigger threshold is set in C0127.
– The reaction OC8 can be used for example for an advance warning.
Fixed reaction OC6−TRIP.
ƒ
– The trigger threshold is set in C0120.
Response of the I
2
The I x t−monitoring is deactivated.
C0066 = 0 % and
MCTRL−LOAD−I2XT = 0,00 % is set.
2
The I x t−monitoring is stopped.
The actual value in C0066 and at the MCTRL−LOAD−I2XT
output is held.
2
The I x t−monitoring is deactivated.
The motor load is displayed in C0066.
)
Note!
An OC6 or OC8 error message can only be reset if the I
fallen below the set trigger threshold by 5 %.
EDKVS9332X DE/EN/FR 4.0
2
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.
2
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.
2
x t−monitoring
l
Safety instructions
Thermal motor monitoring
and a trigger threshold of 100 % releases the
r
Condition
Set the controller inhibit at C0120 = 0 % and
C0127 = 0 %.
Allow controller release at C0120 = 0 % and
C0127 = 0 %.
Set C0606 = 3 (Off) and C0127 > 0 %.
Description
2
× t−monitoring has
117
2