Dc Brake With External Zero Speed Sensor - GE ASTAT XL User Manual

10.5

DC Brake with External Zero Speed Sensor

For loads which may vary between braking cycles, there are benefits in using an external zero-speed
sensor to interface with the ASTAT XL for brake shut-off. This control method ensures that the ASTAT
XL braking will always shut off when the motor has reached a standstill, thus avoiding unnecessary
motor heating.
The following schematic diagram shows how you can use a zero-speed sensor with the ASTAT XL to
turn the brake function off at motor standstill. The zero-speed sensor (A2) is often referred to as an
under-speed detector. Its internal contact is open at zero-speed and closed at any speed above
zero-speed. Once the motor has reached a standstill, 53, 55 will open and the starter will be disabled.
When the next start command is given (ie next application of K10), 53, 55 closes and the ASTAT XL is
enabled.
The ASTAT XL must be operated in remote mode and parameter 6D Input A Function must be set to
'Starter Disable'.
L1
L1
T1
T1 T2
1 Control voltage
54, 55 Start
56, 57 Stop
58, 57 Reset
2 Motor terminals
3 Three-phase supply
4 Starter Disable (shown on starter display)
For details on configuring DC Brake, see Brake (on page 33).
CAUTION
When using DC brake, the mains supply must be connected to the soft starter (input terminals
L1, L2, L3) in positive phase sequence and parameter 4B Phase Sequence must be set to
Positive Only.
ASTAT XL User Manual
L2 L3 N E
-F1
L2 L3 E A4 A5 A6
T2 T3
T3
-K10
M
-K11
3
-K10
54 55 56 57 58
53 55
-K11 -K10
A
B
C
D
E
5
6
DET-812
Fout! Stijl niet gedefinieerd.
-A2
-K11
-K10
Off (Ready)
Start
Run
Stop
Zero speed
Start signal (2, 3, or 4-wire)
Zero speed sensor
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