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Chapter 6 Electrical Controls and Functions
System Controllers
Solenoid Valves
The electrical system on the BP360 includes three (3) directional valves in the hydraulic system. DV-100 controls the
movement of the main hydraulic cylinder and DV-101 controls the movement of the opposing hydraulic cylinder. DV-102
acts as a regeneration circuit valve that returns pressure to the tank when the system is idle. All valves are single
solenoid type with a spring return. When the coil is energized, hydraulic fluid flows from Port A and returns from Port B
to the hydraulic tank. A de-energized state allows oil to flow from Port B, and return from Port A to the tank.
Energizing DV-100 and DV-102 retracts the main cylinder.
De-energizing DV-100 extends the main cylinder.
De-energizing DV-100 and energizing DV-101 extends the opposing cylinder.
De-energizing DV-100 and DV-101 retracts the opposing cylinder.
Limit Switches
Mechanical limit switches are installed on the machine to determine the position of the cylinders and of the ice block
during a cycle. In order for the machine to proceed to the next cycle, both LS-1 and LS-2 must be tripped. The four (4)
switches on the unit are listed below:
•
LS-1 is normally closed and is located in the ice block exit slide. The switch opens when the opposing cylinder
extends to compact the block. If the block does not fall free from the machine, the switch will remain open
and the press will not proceed to the next cycle.
•
LS-2 is normally open and is located at the forward end of the main hydraulic cylinder. When the cylinder is
fully extended to compact the block, the switch will close. This will allow the next block making cycle to
begin. Should the cylinder not fully extend, the block press will not proceed to the next cycle.
•
LS-4 is normally closed and is located at the rear of the main hydraulic cylinder. It senses the full retraction
of the main cylinder. Opening the switch de-energizes DV-100 to allow the main cylinder to move forward.
•
LS-5 is normally open and is located at the front end of the opposing hydraulic cylinder. It detects the full
retraction of the opposing piston. Closing the switch energizes DV-"A1" to extend the opposing cylinder for
the next block making cycle.
Photovoltaic Sensor
A photovoltaic sensor is installed on the machine to detect the presence of ice in the hopper. The photovoltaic is
connected to a relay with two (2) sets of contacts.
•
CR4-2 is normally closed and connects to the starter coil of the ice feed conveyor system. It stops the feed
conveyor when the ice level in the hopper trips the sensor.
•
CR4-1 is normally open and connects to DV-100. It closes when the ice hopper is full of ice. It cycles the
machine when the hopper is full and prevents cycling when the ice level is low.
6-1
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