Operation and Maintenance Manual Rev M(ii) 4/03
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Operating Safety
Notices and Warnings
o
Safety glasses, gloves, and long sleeved clothing are necessary precautions when working with
automated industrial equipment.
o
Read and understand all operating manuals before using this equipment.
o
Do not disable the safety features of the machine.
o
Lock-out and tag the air and power supplies before servicing or cleaning any part of this equipment.
o
Do not remove any hose, either air or fluid, without relieving the pressure.
o
Do not replace any hose with a hose of inadequate pressure rating.
o
Use only replacement parts recommended or supplied by the manufacturer.
o
Always remain clear of all moving parts when the system is in operation.
Safety Devices and Guarding
The workcell has several safety features that protect the operator from hazards during normal operation of
the machine.
NOTE: The safety features should NEVER be bypassed, disabled or tampered with. Precision Valve &
Automation, Inc. is not responsible for any damages incurred, mechanical or human, because of
alteration or destruction of any safety features.
Safety Circuit
The main power to the machine is monitored and controlled by the safety circuit. The safety circuit
contains two relays, under-voltage protection, and one or more safety devices. The relays are wired in a
redundant manner. Redundancy consists of two parallel relay circuits which work together electrically with
the safety devices. The tripping contacts of the relays are connected in series to insure that the safety circuit
will disconnect power even if one of the relays has failed. Self-checking consists of positive guided
contacts which are mechanically forced to operate together. If one of the redundant relays fails, the power
contacts are opened. The safety devices monitor the state of the
EMERGENCY STOP
push button and other
safety mechanisms. When the safety relay detects that the one or more of the safety devices has opened, the
power to the motors and pneumatics is cut.
Lexan Guarding
The work area is enclosed with Lexan guarding. The front of the machine is either open, to allow for
manual part loading and unloading, or guarded by doors.
Doors
For machines with an automatic load/unload cycle the front of the machine is protected by two doors. Each
door is monitored by a non-defeatable limit switch. When the door is opened power to the motors and
pneumatics is disconnected. The
DOOR BYPASS
key switch is provided to allow maintenance personnel
access to the work area without disconnecting power. This bypass switch only allows access during Manual
and Calibration modes.
Summary of Contents for PVA2000
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