MTS Hydraulic Power Unit Model 506-92 - Manual (Page 43)

Theory of Operation 5-6
Motor overload Thermal overload sensors detect excessive current and open the normally
closed contacts connected to the motor starter coil.
Motor overload relay contacts OL1, OL3, or OL5, all at PLC input 12,
open to turn off the HPU if the respective pump motor 1, pump motor 2,
or supercharge pump motor is drawing excessive current. The LED lights
from PLC output 10
When an overload condition occurs, the reset button on the motor
overload relay must be pressed (see Subsection 3.3.1).
N O T E Hydraulic power supplies are often customized for specific
applications. Actual wiring may differ from what is shown
in Figure 5-2.
You will find the wiring schematic for your system in the
product information kit inside the starter box and in the
Assembly Drawings manuals specific to your system.