Soft Braking - GE ASTAT XL User Manual

10.6

Soft Braking

For applications with high inertia and/or a variable load, the ASTAT XL can be configured for soft
braking.
In this application the ASTAT XL is employed with forward run and braking contactors. When the ASTAT
XL receives a start signal (pushbutton S1), it closes the forward run contactor (K1) and controls the
motor according to the programmed primary motor settings.
When the ASTAT XL receives a stop signal (pushbutton S2), it opens the forward run contactor (K1) and
closes the braking contactor (K2) after a delay of approximately 2-3 seconds (K1T). K12 is also closed to
activate the secondary motor settings, which should be user programmed for the desired stopping
performance characteristics.
When motor speed approaches zero, the zero speed sensor (A2) stops the soft starter and opens the
braking contactor (K2).
5
6
1 Control voltage (model dependent)
2 Remote control inputs
3 Motor thermistor input
4 Relay outputs
5 Three-phase supply
6 Motor terminals
Parameter settings:
• Parameter 6D Input A Function (terminals 53, 55)
• Select 'Motor Set Select' - assigns Input A for Motor set selection.
• Set starting performance characteristics using the primary motor set.
• Set braking performance characteristics using the secondary motor settings.
• Parameter 7G Relay C Function
• Select 'Trip' - assigns Trip function to Relay Output C.
NOTE
If the ASTAT XL trips on supply frequency (parameter 16F Frequency) when the braking
contactor K2 opens, modify the frequency protection settings.
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ASTAT XL User Manual
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DET-812
Fout! Stijl niet gedefinieerd.
A2 Zero speed sensor
K10 Run relay
K11 Start relay
K12 Brake relay
K13 Zero speed sensor relay
K1 Line contactor (Run)
K2 Line contactor (Brake)
K1T Run delay timer
K2T Brake delay timer
K3T Zero speed sensor delay timer
S1 Start contact
S2 Stop contact
S3 Reset contact