GE M60 Instruction Manual page 249

5 SETTINGS
a) MAIN MENU

PATH: SETTINGS GROUPED ELEMENTS
 MOTOR

MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
b) ACCELERATION TIME

PATH: SETTINGS GROUPED ELEMENTS
 ACCELERATION TIME

MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
Many motors have quite a time margin between acceleration-time and the stall limit. It is advantageous to detect stalling
during a start as early as possible to minimize re-starting delays once the cause of the stall is remedied, e.g. neglecting to
release a fan brake.
The acceleration time element compares actual starting time with a pre-determined time setting and operates when it is
exceeded. This element has the functionality to adapt the tripping time for starts with lower starting current, and it stores
acceleration time and current of the last five starts. The element uses currents configured under
 and motor status asserted by the thermal model element. Both the signal source and thermal pro-
MOTOR LINE SOURCE
tection must be configured properly in order for the acceleration time protection to operate.
The figure below shows examples of constant and variable acceleration currents and explains measurement of the acceler-
ation time and current. Part A represents a constant current start and part B represents a variable current start.
GE Multilin
 
SETTING GROUP 1(6) MOTOR
 ACCELERATION
 TIME
 THERMAL MODEL

 AMP UNBALANCE 1

 AMP UNBALANCE 2

 UNDERCURRENT

 MECHANICAL JAM

 TWO-SPEED MOTOR

 
SETTING GROUP 1(6) MOTOR
ACCELERATION
FUNCTION: Disabled
ACCELERATION
CURRENT: 6.00 x FLC
ACCELERATION TIME:
10.00 s
ACCELERATION MODE:
Definite Time
ACCELERATION BLOCK:
Off
ACCLERATION TARGET:
Self-reset
ACCLERATION EVENTS:
Disabled
M60 Motor Protection System
5.6 GROUPED ELEMENTS
See page 5-111.
See page 5-113.
See page 5-132.
See page 5-132.
See page 5-134.
See page 5-133.
See page 5-136.

ACCELERATION TIME
Range: Disabled, Enabled
Range: 1.00 to 10.00 x FLC in steps of 0.01
Range: 0.50 to 180.00 s in steps of 0.01
Range: Definite Time, Adaptive
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
SYSTEM SETUP
5.6.3 MOTOR
5

MOTOR
5-111