GE SPM Series, Instruction Manual

Page: 82 / 126

7-
8
SPM Synchronous Motor Protection & Control GE Power Management
7.5 PROGRAMMING 7 TESTING AND TROUBLESHOOTING
7
7.5 PROGRAMMING 7.5.1 PROGRAMMING EXAMPLE
The following example uses the following motor data and should be referred to as the example progresses.
The data is for a 400 hp 4000 V ring-type motor. We will assume that all of the optional features available with
the SPM have been installed. The following pages show the keypresses made by the operator, the SPM dis-
play response, and comments concerning the programming operation. The
SPM READY message should be
displayed at the beginning of the operation. Refer to Chapter 7 for programming the SPM for brush-less
motors.
Motor: 400 hp, PF = –0.8, 720 RPM, 4000 V.
Induced field current: 0% SPD, 30 A; 95% SPD, 17 A.
Recommended field discharge resistance: 21
Ω
Allowable stall time: 7 seconds
50 percent run time: 11 seconds.
The induced field voltage (product of induced field in amperes and discharge resistance in ohms)
must fall between 200 and 1000 V at both zero and 95% speed. For this example:
21
Ω ×
30 A = 630 V (zero speed check)
21
Ω ×
17 A = 357 V (95% speed check)
The criterion is thus met for this example.
If induced field voltage is greater than 1000 volts, contact the factory
Table 7–2: PROGRAMMING EXAMPLE (Sheet 1 of 4)
KEYPRESS DISPLAY COMMENTS
None Ready-mode display
Enter STAT mode on the way to PROGRAMMING MODE
In PROGRAMMING MODE - must now enter the password
Use SCROLL keys to enter password and then press ENTER to
verify the password
First menu after password entry is CONFIGURATIONS menu -
must scroll past it to get to SETPOINTS menu
Press SELECT/ENTER key to enter setpoint menus
First setpoint is PF TRIP. SCROLL Key(s) to select value of -0.85
and then SELECT/ENTER key to accept new value.
NOTE
Coll-Ring Motor
SPM READY
STAT MODE
SCROLL for menus
PROGRAMMING MODE
SCROLL passwords
PASSWORD: 0000
ENTER to verify
ENTER
CONFIGURATIONS?
ENTER for menus
SETPOINTS?
ENTER for menus
ENTER
PF TRIP: –0.80
ENTER to modify