A SERVICE OF

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7/50D Plus or 7/50D Controller Chapter 2: Functional Description 13
At no time should the safety device fail and allow the operation to continue for example, if a
safety switch is guarding a motor, and the safety switch fails, the motor should not be able to
run.
Safety Device Lock-Outs
Some safety devices disconnect electrical energy from a circuit. The safety devices that are
used in this Controller are primarily concerned with electrical power disconnection.
WARNING! Always disconnect and lockout all electrical power and pneumatic (i.e. compressed air)
sources prior to servicing the 7-Pump, 50D & D Plus-Station Controller. Failure to
do so may result in serious injury. No one but the person who installed the lockout
may remove it.