Milnor MP1540 Series, Manual

Page: 38 / 107

PELLERIN MILNOR CORPORATION
BISUUI02 (Published) Book specs- Dates: 20070507 / 20070507 / 20070508 Lang: ENG01 Applic: SUU
Wiring Safety Fence Gate Interlocks on Milnor
®
Shuttles,
Presses and Centrifugal Extractors
This document is to be used in conjunction with Milnor document W6SYSSG “Micro 6 Systems
Schematic: Customer-Provided Safety Fence Gate Interlock”. Together, these documents describe
how to connect a customer-provided gate switch or series of switches to any Milnor shuttle, press,
or centrifugal extractor. Another Milnor document—BISUUI01 “Proximity Safeguarding for
Automatic Shuttle Conveyors”—discusses the general hazards that safety fencing addresses.
1.
Precautions
WARNING 1 : Electrocution and Electrical Burn Hazards —Contact with electric power
can kill or seriously injure you. Electric power is present inside the cabinetry unless the main
machine power disconnect is off.
• Do not service the machine unless qualified and authorized. You must clearly understand
the hazards and how to avoid them.
• Perform all work with machine power locked out/tagged out.
WARNING 2 : Strike and Crush Hazards —A traveling machine such as a shuttle can
strike, crush, or entrap you if you ride on it or enter its path. Traveling machines or their
components can move automatically in any direction. Placing a system machine on line by
energizing the machine control may immediately summon a shuttle or other traveling machine.
• Lock out and tag out power to the traveling machine at the main machine disconnect if
you must work in the path of the traveling machine.
2.
Wiring Guidelines
As explained in BISUUI01, a gate interlock switch must have one pole per machine to be
interlocked. Each pole on the switch must be electrically isolated from any other poles on that
switch. The gate interlock circuit for a given machine is a series circuit that includes one pole per
switch (per gate). This circuit is wired into, and becomes part of the machine's
three-wire circuit
(see definition below).
three-wire circuit —a circuit that provides control power for all machine functions. Any of
several safety devices in the three-wire circuit will open the circuit and stop machine operation
if a malfunction is detected. Once open, the three-wire circuit can only be closed by manual
intervention and then only if the condition that opened the circuit is rectified.
W6SYSSG depicts schematically, various circuit segments the technician may encounter,
depending on the type and age of the machine. Only one depiction will match a given machine. It
may be helpful to refer to the electrical schematics for your machine; however, you should be
able to identify the pertinent electrical components by referring to the tags inside the electric box
doors on your machine. You will use one of two wiring methods depending on which circuit
segment on W6SYSSG corresponds to your machine:
1. Jumpered terminals —Remove the jumper and connect the two incoming conductors to the
terminals (pins) where the jumpers were removed. A tag was tied to the jumper at the factory
to identify this as the gate interlock switch connection point.
2. Circuitry that must be split —Locate convenient connection points (e.g., a pin on a switch)
at which to split the circuit and connect the incoming conductors. You may need to splice
wires to complete the connection.
34