MTS Series 244 Actuators - Manual (Page 34)

Know potential crush and pinch points
Be aware of potential crush and pinch points on your system and keep personnel and equipment clear of
these areas.
An important consideration for servohydraulic systems is that when power is interrupted, it is likely that stored
accumulator pressure will persist for some time within the system. In addition, it is likely that as stored energy
dissipates, gravity will cause portions of the system to move.
Be aware of component movement with hydraulics off
For hydraulic systems, be aware that mechanical assemblies can shift or drift due to changes within hydraulic
hardware when hydraulics are turned off. This non-commanded movement is because oil can transfer between
the pressure and return ports and across internal components of the hydraulic hardware. Be aware that this
can happen and clear the area around the mechanical assemblies when hydraulics are turned off.
Know electrical hazards
When the system electrical power is turned on, minimize the potential for electrical shock hazards. Wear
clothing and use tools that are properly insulated for electrical work. Avoid contact with exposed wiring or
switch contacts.
Whenever possible, turn off electrical power when you work on or in proximity to any electrical system
component. Observe the same precautions as those given for any other high-voltage machinery.
Make sure that all electrical components are adequately grounded. Grounds must remain connected and
undisturbed at all times.
Ensure Correct Cable Connection
If a system cable has been disconnected, ensure that you establish the correct cable-to-connector relationship
during reconnection. Incorrect cable connections can result in improper servo loop phasing or an open servo
loop condition, either of which can cause unstable or unexpected and potentially dangerous system motions.
Verify the correct cable-to-connector relationship by observing the cable and connector labeling and the
system wiring schematics.
Keep bystanders safely away
Keep bystanders at a safe distance from all equipment. Never allow bystanders to be in close proximity of
specimens or equipment while the test is running.
Wear proper clothing
Do not wear neckties, shop aprons, loose clothing or jewelry, or long hair that could get caught in equipment
and result in an injury. Remove loose clothing or jewelry and restrain long hair.
Remove flammable fluids
Remove flammable fluids from their containers or from components before you install the container or
component. If desired, you can replace the flammable fluid with a non-flammable fluid to maintain the proper
proportion of weight and balance.
Know compressed gas hazards
Your system may contain accumulators that require a high-pressure gas precharge (pressures that exceed
138 bar [2000 psi]). High-pressure devices are potentially dangerous because a great amount of energy is
available in the event of an uncontrolled expansion or rupture.
Observe the following safety practices when you work with high-pressure air or gases:
34 Series 244 Actuators Product Information
Safety