GE Industrial Solutions AF-650 GP General Purpose Drive (460_575_690V 125HP and above) - Manual (Page 76)

Par. F − 07 =
tacc s x ns RPM
ref RPM
F-08 Decel Time 1
Range: Function:
3.00 s* [0.01 - 3600.00 s] Enter the decel time, i.e. the deceleration time from the synchronous motor speed n
s
to 0 RPM. Choose a
decel time such that no over-voltage arises in the inverter due to regenerative operation of the motor,
and such that the generated current does not exceed the current limit set in par. F-43 Current Limit. The
value 0.00 corresponds to 0.01 s in speed mode. See accel time in par. F-07 Accel Time 1.
Par. F − 08 =
tdec s x ns RPM
ref RPM
F-10 Electronic Overload
Option: Function:
The frequency converter determines the motor temperature for motor protection in two different ways:
• Via a thermistor sensor connected to one of the analog or digital inputs (par. F-12 Motor Ther-
mistor Input).
• Via calculation of the thermal load, based on the actual load and time. The calculated thermal
load is compared with the rated motor current I
M,N
and the rated motor frequency f
M,N
. The
calculations estimate the need for a lower load at lower speed due to less cooling from the fan
incorporated in the motor.
[0] * No protection Continuously overloaded motor, when no warning or trip of the frequency converter is required.
[1] Thermistor warning Activates a warning when the connected thermistor or KTY-sensor in the motor reacts in the event of
motor over-temperature.
[2] Thermistor trip Stops (trips) frequency converter when connected thermistor in motor reacts in the event of motor over-
temperature.
The thermistor cut-out value must be > 3 kΩ.
Integrate a thermistor (PTC sensor) in the motor for winding protection.
[3] Electronic Overload Warning 1
[4] Electronic Overload Trip 1
[5] Electronic Overload Warning 2
[6] Electronic Overload Trip 2
[7] Electronic Overload Warning 3
[8] Electronic Overload Trip 3
[9] Electronic Overload Warning 4
[10] Electronic Overload Trip 4
AF-650 GP High Power Operating Instructions
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