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3.4.0 Interlocks

The test controller incorporates interlock circuitry that can automatically stop a test when a system problem,

specimen failure, or an operator error could result in unwanted or unexpected actuator movement.The test

controller interlock circuitry will cause one of two interlocks to occur in response to specific conditions

encountered during testing. These interlocks are:

• Hydraulic Interlock – stops the program and removes hydraulic pressure from the system.

• Program Interlock – stops the current test program when certain test parameters are not met or are

exceeded.

Because specimen installation procedures and testing situations can be adversely affected by the sudden

loss of actuator pressure that accompanies a hydraulic interlock, the operator might choose to enable or

disable the interlock detectors during system setup. Disabling the interlock detectors allow the operator to

prevent a hydraulic shutdown if an interlock condition occurs. the following table lists the possible types of

interlock conditions for the test controller.

Table 4: Interlocks

Type of InterlockCauseCondition

HydraulicEmergency Stop or E-Stop button pressedEmergency Stop

ProgramOpen circuit at the Prog Intlk rear panel connectorProgram Aux

HydraulicFault in the performance of hydraulic componentsHydraulic event

HydraulicFault in the performance of mechanical componentsMechanical event

Hydraulic or ProgramCompletion of a preset number of cycles in the current

test program

End-of Count

Hydraulic with indicator

option

Selected signal fails to reach a preset minimum or

maximum level

Underpeak

Hydraulic with indicator

option

When the control channel's DC error signal exceeds

a preset maximum level

Error

Hydraulic with indicator

option

Transducer feedback signal exceeds a preset

minimum or maximum level

Upper LimitLower Limit

These interlocks can be set to indicate only. For further information on configuring these interlocks, refer to

the test controller documentation.

These interlocks can be set to indicate only. For further information on configuring these interlocks, refer to

the test controller documentation.

These interlocks can be set to indicate only. For further information on configuring these interlocks, refer to

the test controller documentation.

24 MTS Material Test System Operation

3.0 Introduction

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