•For granulators equipped with conveyors, fans, etc., test their operation also by pressing the appropriate pushbutton. Check fan outlets for proper airflow.

•For granulators with emergency stop pushbuttons, test the buttons to insure all motion stops.

•With the granulator running, loosen the handknob on the front access doors and screen chamber to verify the safety interlock switch shuts the machine off. If the hand knob is completely loose and the power does not disconnect, the interlock switch is not working and the cause of the malfunction must be determined.

Alternate Procedure for testing interlock switch operation

1.Depress the stop/start push button to shut down the granulator

2.Disconnect and lockout the main power supply to the granulator as required by OSHA’s Lockout/Tag out requirements.

3.Using the wiring diagram supplied with your granulator or by tracing the wires from the interlock switches, locate the interlock switch wire numbers on the terminal strip in the control panel. They will usually be marked #1 & #3, #3 & #4 and #4 & #5 etc. depending on how many switches are used on your machine.

4.Connect the leads of and ohm meter across each interlock switch or across all interlock switches (wires #1 and #5). Set the ohm meter on the lowest resistance scale. When the interlock actuator bolts are in place and properly activating the switch, the ohm meter will read zero resistance.

5.Loosen the actuator bolt of each interlock switch (usually about 3 or 4 turns) one at a time, until the ohm meter reads infinite resistance. If the meter reads infinity before the bolt can be completely removed, the interlock is working. If the actuator bolt can be completely removed and the resistance DOES NOT read infinity, the interlock is not working and the complete mechanism including the switch must be removed and disassembled to determine the cause of the malfunction.

If testing determines that an interlock is not working, BE SURE TO SHUT DOWN THE GRANULATOR, PULL IT OUT OF SERVICE AND LOCKOUT THE MAIN POWER before removing the front cover, opening the hopper or attempting to gain access to the interlock switches. The interlock switches and mechanisms can be accessed by removing the belt guard on the right side of the granulator. In some cases, it may be necessary to remove or slide back the flywheel to completely remove the interlock switch assembly.

BP1620, BP1628 & BP1640 Granulators

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Sterling BP1620, BP1628, BP1640 installation manual Alternate Procedure for testing interlock switch operation
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BP1620, BP1640, BP1628 specifications

The Sterling BP1620, BP1640, and BP1628 are a trio of innovative pressure washing machines designed to meet the diverse needs of both commercial and residential users. Each model features a robust construction accompanied by advanced technologies, making them highly efficient for various cleaning tasks.

The Sterling BP1620 is powered by a durable electric motor that delivers a pressure output of up to 1600 PSI. This model is particularly well-suited for light to medium cleaning tasks such as patio cleaning, car washing, and outdoor furniture maintenance. One of its standout features is the adjustable nozzle, which allows users to switch between different spray patterns easily. Additionally, the BP1620 is equipped with a lightweight frame and ergonomic design, promoting ease of use and maneuverability.

On the other hand, the Sterling BP1640 is designed for professionals and those needing more power for heavy-duty cleaning tasks. It boasts an impressive 2400 PSI output, making it ideal for cleaning larger surfaces, driveways, and decks. A unique characteristic of the BP1640 is its integrated detergent tank, which enhances cleaning efficiency by allowing users to apply soap effortlessly during washing. The quick connect fittings make attachments simple, while the high-pressure hose is reinforced for added durability.

The Sterling BP1628 sits comfortably between the BP1620 and BP1640, offering a versatile solution for a range of applications. With a maximum pressure of 2200 PSI, it is well-equipped for medium to heavy-duty tasks. The inclusion of multiple nozzle tips provides versatility, enabling users to tackle diverse surfaces like brick, concrete, and wood. Its compact design ensures easy storage, while the adjustable pressure settings allow for customized cleaning based on the task at hand.

All three models incorporate an advanced cooling system that prevents overheating during prolonged use, thereby extending their lifespan. The innovative thermal protection feature ensures safe operation by automatically shutting off the unit in case of overheating, while additionally, the machines are designed with user safety in mind, featuring non-slip grips and sturdy bases.

In summary, the Sterling BP1620, BP1640, and BP1628 are exemplary power washing machines that combine ease of use, durability, and efficient cleaning capabilities. With various pressure outputs and features tailored to different user needs, they are poised to handle any cleaning challenge, whether for home maintenance or professional use.
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