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3.3 BRUSHLESS CONTROLLER
The brushless motor is started by first applying power to the stator windings then applying DC to the exciter
field. See Figure 2–3: TYPICAL WIRING DIAGRAM on page 2–4 for details. There are two basic timing func-
tions a brushless controller must provide during start:
1. Apply DC to exciter (not main) field a given preset time after stator windings are energized.
2. Enable the power factor, pull-out protection, and provide a contact for signaling external automatic motor
loading devices for motor loading. This is determined by a second given pre-set time delay that allows suf-
ficient time after the application of the exciter field for the motor to synchronize and stabilize.
Both of these times can be entered as setpoint parameters in the SPM. (See programming, Section 4-9.)
3
Figure 3–15: BRUSHLESS STALL/ACCELERATION CHARACTERISTIC
3-
18
Courtesy of store.ips.us
2000
1500
A
1000
B
900
800
700
C
600
500
400
300
200
150
100
90
80
70
60
50
40
30
20
15
10
9
8
7
6
5
4
3
2
.9 1
1.5
2
Trip Current
(Multiples of Programmed Full Load Current)
SPM Synchronous Motor Protection and Control
3 SYNCHRONOUS MOTOR APPLICATIONS
3.3.3 STARTING THE BRUSHLESS MOTOR
Stall Time - 30 Sec
Locked Rotor - 6XFLC
Stall Time - 10 Sec
Locked Rotor - 6XFLC
Stall Time - 2 Sec
Locked Rotor - 6XFLC
A
B
C
3
4
5
6
7 8 10
701762A5.CDR
GE Multilin
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