GE Multilin MM200 Quick Start Manual page 21

QUICKSTART GUIDE
MM200 MOTOR MANAGEMENT SYSTEM – QUICKSTART GUIDE
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.
=
Trip time
=
= 9.714 seconds
This would respect a safe stall cold time of 10 seconds.
The standard overload curves are displayed below.
Figure 18: Standard overload curves
100000
10000
1000
100
10
1.00
0.10
The trip times for the standard overload curves are tabulated below.
´
Curve Multiplier
2.2116623
2
0.02530337 x (Pickup - 1) + 0.05054758 x (Pickup -1)
´
7 2.2116623
2
0.02530337 x (8 - 1) + 0.05054758 x (8 -1)
1.00
10
MULTIPLE OF FULL LOAD AMPS
PROTECTION ELEMENTS
x15
x1
100
888731A2.CDR
Eq. 3
1000
17