MTS Criterion 60 - Manual - Manual (Page 90)

MTS Criterion™ Series 60 Product Manual 90 Troubleshooting
An interlock is active Upper actuator limit. On the MTS Criterion Series 60 an
upper limit can be tripped if the
piston extends too far (risk of
bypassing seal), or if the piston is too
close to the crosshead (piston moving
up or crosshead moving down).
Lower actuator limit. On the MTS Criterion Series 60 a
lower limit is tripped if the grips in
the upper test space are too close
(piston moving down or crosshead
moving up).
Servo error limit. The servo error represents a position
error (command minus feedback). If
the servo error is large, it indicates
the controller is having problems.
This error detector is part of the
safety system that can help detect
problems with the feedback (cable
disconnected, sensor bad). On the
MTS Criterion Series 60, the
machine can achieve higher speeds
with the actuator moving up than
down.
A likely reason for tripping the
servo error limit is commanding
down motion at speeds greater than
which the machine is capable.
Program stops Check if any digital input is
programmed as stop.
Digital inputs can be programmed as
with a program stop function.
Cannot reach full-scale
load Check if there is any oil leakage on
the mainframe and the hydraulic
source.
Check if the viscosity of the
hydraulic oil is enough or not.
After heavy use, the viscosity of the
oil may decrease.
Check if the safety relief valve
pressure is set too low.
Basic Troubleshooting
S YMPTOM C HECK R EASON