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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.