GE AF-650 GP Programming Manual page 79

Parameter Descriptions
H-88 Motor Inertia
Range:
3 3
H-89 System Inertia
Range:
0.0048 [0000 -
kgm2 10000.0000
*
kgm2]
3.7.9 H-9# Motor Temperature
Parameters to configure the special KTY sensor when used
as a thermistor source and when Parameter F-12
Thermistor Source is enabled.
KTY Sensor Connection
KTY sensors are used especially in Permanent Magnet
Servo Motors (PM motors) for dynamic adjusting of motor
parameters as stator resistance (parameter P-30 Stator
Resistance (Rs)) for PM motors and also rotor resistance
(parameter P-31 Rotor Resistance (Rr)) for asynchronous
motors, depending on winding temperature. The
calculation is:
Rs = Rs x (1 + α
20° C
KTY sensors can be used for motor protecting
(parameter H-97 KTY Threshold level).
AF-650 GP can handle three types of KTY sensors, defined
in parameter H-95 KTY Sensor Type. The actual sensor
temperature can be read out from parameter DR-19 KTY
sensor temperature.
Illustration 3.33
78
Function:
mechanical torque on the shaft.
Available in flux control principle
only.
Function:
NOTICE
Valid for AF-650 GP only.
This parameter cannot be
adjusted while motor is
running.
Active in flux open loop only. Used
to compute the acceleration torque
at low speed. Used in the torque
limit controller.
x ΔT) Ω where α = 0 . 00393
cu cu
02/2016 All rights reserved.
NOTICE
If the temperature of the motor is utilized through a
thermistor or KTY sensor the PELV is not complied with
in case of short circuits between motor windings and
sensor. In order to comply with PELV the sensor must be
extra isolated.
NOTICE
Valid for AF-650 GP only.
H-94 ATEX overload cur.lim. speed reduction
Range: Function:
0 % [0 - 100 %] Only visible if parameter F-10 Electronic
*
Overload is set to [20].
Configure the reaction for operating in Ex-e current limit.
0%: The frequency converter does not change anything
besides issuing warning 163, ATEX ETR cur.lim.warning.
>0%: The frequency converter issues warning 163, ATEX ETR
cur.lim.warning and reduces motor speed following ramp 2
(parameter SP-76 Accel/Decel Time 2 Type).
Example:
Actual reference = 50 RPM
Parameter H-94 ATEX overload cur.lim. speed reduction = 20%
Resulting reference = 40 RPM
H-95 KTY Sensor Type
Option: Function:
Select the used type of KTY sensor.
1 kΩ at 100 °C.
[0] KTY Sensor 1
*
1 kΩ at 25 °C.
[1] KTY Sensor 2
2 kΩ at 25 °C.
[2] KTY Sensor 3
H-96 KTY Thermistor Input
Option: Function:
NOTICE
Valid for AF-650 GP only.
Selecting analog input terminal 54 to be used
as KTY sensor input. Terminal 54 cannot be
selected as KTY source if otherwise used as
reference (see parameter F-01 Frequency Setting
1 to parameter C-34 Frequency Command 3).
NOTICE
Connection of KTY sensor between term.
54 and 55 (GND). See Illustration 3.9.
[0] None
*
[2] Analog
Input 54
DET-618D