CHAPTER 5: SETTINGS GROUPED ELEMENTS
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-209
5
Figure 5-107: Typical motor acceleration characteristics
VD STALL CURRENT @ 100% V — This setting defines the locked rotor current level at the rated motor voltage (I
3
).
VD SAFE STALL TIME @ 100% V — This setting defines the maximum time the motor is allowed to withstand the locked rotor
current at rated motor voltage (t
3
).
VD ACCEL. INTERESECT @ 100% V — This setting defines the starting current level corresponding to the crossing point
between the acceleration thermal limit at rated voltage and the programmed relay overload curve (I
4
). This value can be
typically determined from the motor acceleration curves. The current value at the breakdown torque for the 100% voltage
start is recommended for this setting.
The figure shows the voltage dependent overload curves.
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