Vacon 20 SERIES User Manual

Parameter description vacon • 56
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3
P10.12 MOTOR THERMAL TIME CONSTANT
Time at nominal current, to reach nominal temperature.
The time constant is the time within which the calculated thermal stage has reached 63% of its
final value. The bigger the frame and/or slower the speed of the motor, the longer the time
constant.
The motor thermal time is specific to the motor design and it varies between different motor
manufacturers. The default value of the parameter varies from size to size.
If the motor's t6-time (t6 is the time in seconds the motor can safely operate at six times the
rated current) is known (given by the motor manufacturer) the time constant parameter can be
set basing on it. As a rule of thumb, the motor thermal time constant in minutes equals to 2*t6.
If the drive is in stop stage the time constant is internally increased to three times the set pa-
rameter value. The cooling in stop stage is based on convection and the time constant is in-
creased.
Figure 13. Motor temperature calculation.
P10.13 FIELDBUS COMMUNICATION FAULT
0: No action
1: Warning
2: Fault
Communication lost.
P10.14 T
HERMISTOR FAULT
0: No action
1: Warning
2: Fault
Impedance on thermistor input is above fault threshold.
105%
Q = (I/I
T
)
2
x (1-e
-t/T
)
I/I
T
Trip area
Motor temperature
Time
Motor temperature
Time constant T
*)
*)
Changes by motor size and
adjusted with P10.12
Fault/alarm
P10.9
Motor•
current

Vacon 20 SERIES Specifications

General

Output Voltage	0 to Input Voltage
Storage Temperature	-40°C to +70°C
Dimensions	Varies by model
Weight	Varies by model
Power Range	0.25 kW to 18.5 kW
Voltage Range	200 V to 480 V
Control Method	Sensorless vector control
Protection Class	IP20
Ambient Temperature	-10°C to +50°C
Communication Options	Modbus, CANopen
EMC Filter	Integrated
STO (Safe Torque Off)	Yes
Input Voltage	208-240 V, 380-480 V
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overtemperature
Operating Temperature	-10°C to +50°C
Humidity	5% to 95% non-condensing