Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 23, Problem 3SQ
What will happen if the start and jog push buttons of the circuit shown in Figure 23–4 are pushed at the same time?
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A press's machine cycle is as follows:
Lowering the ram: the ram is lowered when 0
The safety screen was open before the cycle began and
is now closed (limit switches S4 and S5 actuated)
The press is in the home, i.e. upper position (limit switch
S6 actuated)
Two-hand switches S1 and S2 were not actuated prior to
the cycle but are now
Halting the ram during lowering: the ram stops 0
;immediately when
One of the two-hand switches is released. Or
.
The safety screen is opened. Or
.
.The ram is down (limit switch S3 actuated)
Raising the ram: If the ram is down (limit switch S3
actuated), it is raised by the eccentric drive. The safety
.screen can be opened and both two-hand switches released
The machining cycle is completed when the ram reaches the
home position (limit switch S6 actuated)
The designer needs for ........conditional output boxes for drawing the
ASM-chart for the controller of the aforementioned system
0 C
2
3
O O O O O O
Consider a system with four pushbuttons and three lamps and three
motors.
PB 1 is used for main system ON. PB 4 is used Main OFF.
Lamp 1 has to switch ON for the moment PB 2 is pressed. If the PB 2 is
pressed for ten times lamp 2 has to ON.
Motor 1 has to switch ON for the moment when PB 2 and PB 3 is pressed.
If PB 3 is pressed for five times motor 2 has to ON.
Explain by drawing how intermediate switch is working in ON and OFF position.
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