GE Industrial Solutions AF-650 GP General Purpose Drive Programming Guide - Manual (Page 71)

function the tolerance is independent of the task time
because the stop signal immediately interrupts the
execution of the frequency converter program. The precise
stop function gives a highly reproducible delay from the
stop signal is given until the ramping down starts. A test
must be done to find this delay as it is a sum of sensor,
PLC, frequency converter and mechanical parts.
To ensure optimum accuracy there should be at least 10
cycles during ramping down, see F-08 Decel Time 1,
E-11 Decel Time 2, E-13 Decel Time 3 and E-15 Decel Time 4.
The Precise Stop Function is set up here and enabled from
DI T29 or T33.
H-84 Precise Stop Counter Value
Range: Function:
100000 * [0 -
999999999]
Enter the counter value to be used in
the integrated precise stop function,
H-83 Precise Stop Function.
The maximum permissible frequency
at terminal 29 or 33 is 110 kHz.
NOTE
Not used for selection [0] and [3]
in H-83 Precise Stop Function
H-85 Precise Stop Speed Compensation Delay
Range: Function:
10 ms * [0 - 100
ms]
Enter the delay time for sensors, PLCs, etc.
for use in H-83 Precise Stop Function. In
speed compensated stop mode, the delay
time at different frequencies has a major
influence on the stop function.
NOTE
Not used for selection [0], [1] and [2] in
H-83 Precise Stop Function
H-87 Load Type
Option: Function:
[0] * Passive load For conveyers, fan and pump applications.
[1] Active load For hoisting applications, used in slip
compensation at low speed. When [1] Active
Load is selected, set H-66 Min. Current at Low
Speed to a level which corresponds to
maximum torque.
H-88 Minimum Inertia
Range: Function:
0.0048
kgm2 *
[0.0001 -
par. H-89
kgm2]
NOTE
This parameter cannot be adjusted
while motor is running.
Needed for average inertia calculation.
Enter the minimum moment of inertia of
the mechanical system. H-88 Minimum
H-88 Minimum Inertia
Range: Function:
Inertia and H-89 Maximum Inertia are
used for pre-adjustment of the Propor-
tional Gain in the speed control, see
PI-02 Speed PID Proportional Gain.
H-89 Maximum Inertia
Range: Function:
0.0048
kgm2 *
[par. H-88 -
0.4800 kgm2]
NOTE
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.
3.7.8 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 (P-30 Stator Resistance (Rs))
for PM motors and also rotor resistance (P-31 Rotor
Resistance (Rr)) for asynchronous motors, depending on
winding temperature. The calculation is:
Rs = Rs
20° C
x (1 + α
cu
x Δ T ) Ω where
α
cu
= 0.00393
KTY sensors can be used for motor protecting (H-97 KTY
Threshold level).
AF-650 GP can handle three types of KTY sensors, defined
in H-95 KTY Sensor Type. The actual sensor temperature can
be read out from DR-19 KTY sensor temperature.
Illustration 3.32
Parameter Descriptions AF-650 GP Programming Guide
70 DET-618C
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