GE SPM Series, Instruction Manual

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SPM Synchronous Motor Protection & Control GE Power Management
3.3 BRUSHLESS CONTROLLER 3 SYNCHRONOUS MOTOR APPLICATIONS
3
3.3.3 STARTING THE BRUSHLESS MOTOR
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.)
Figure 3–15: BRUSHLESS STALL/ACCELERATION CHARACTERISTIC
701762A5.CDR
2
200
150
3
7
4
8
9
6
15
300
30
500
20
400
70
900
80
1000
90
1500
40
600
60
800
50
700
5
10
100
2000
.8 .9 1
4 7 8 10 6 5 3 2 1.5
Trip Current
(Multiples of Programmed Full Load Current)
T
rip
T
ime
(seconds)
A
B
C
A
B
C
Stall Time - 30 Sec
Locked Rotor - 6XFLC
Stall Time - 10 Sec
Locked Rotor - 6XFLC
Stall Time - 2 Sec
Locked Rotor - 6XFLC