GE Multilin MM200, Быстрый старт

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QUICKSTART GUIDE PROTECTION ELEMENTS
MM200 MOTOR MANAGEMENT SYSTEM – QUICKSTART GUIDE 17
For example, a motor with a stall current (also known as locked rotor current) of 8 times its
FLA, with a curve multiplier of 7, if stalled from a cold state, trips in the following amount of
time.
Eq. 3
This would respect a safe stall cold time of 10 seconds.
The standard overload curves are displayed below.
Figure 18: Standard overload curves
The trip times for the standard overload curves are tabulated below.
´
=
Curve Multiplier
time Trip
2.2116623
0.02530337 x (Pickup - 1) + 0.05054758 x (Pickup -1)
2
´
=
7 2.2116623
0.02530337 x (8 - 1) + 0.05054758 x (8 -1)
2
=
9.714 seconds
x1
x15
100000
10000
1000
100
10
1.00
0.10 1.00
MULTIPLE OF FULL LOAD AMPS
TIME
IN
SECONDS
10 100 1000
888731A2.CDR