Parker -W4P, User Manual

Page: 62 / 110

62
MSC4000 - MSC15000 USER MANUAL
5. Routine Maintenance
This section covers the various components that require periodic maintenance and/or replacement.
Coalescing Filter Element
The coalescing filter element should be check Bi-Annually.
The filter differential can be viewed on the controller HMI. If it is determined that there is a high pressure drop across
the machine, remove the filter element from the machine and inspect it. If the filter is dirty, replace it. Ensure that air
pressure is removed from the machine prior to removing the filter element.
The coalescing element should be changed annually. To change the filter element:
• Ensure that air pressure is removed from the machine!!
• Remove the bolts that secure the filter housing cover.
• Remove the wing nut that secures the filter cap to the element.
• Remove the filter cap.
• Remove the existing element from the housing.
• Install the replacement element.
• Reinstall the filter cap and wing nut
• Reinstall the filter cover.
Condensing Coil (Air Cooled Units)
The condensing coil should be cleaned weekly. Ensure that air pressure is removed from the system prior to cleaning
the condenser. The condenser can be cleaned by using a vacuum or compressed air. If the condenser is not clean
after it is blown out with compressed air or vacuumed contact the factory for assistance.
4.10 Remote PLC Operation
There are five inputs on the PLC dedicated to using external switches or relays to control the dryer operation.
These inputs require a 120VAC signal. Refer to the dryers wiring schematic for details.
Alarm Reset (PLC input 20)
• wired to a normally open SPST pushbutton switch or momentary PLC relay contact
• resets all alarms on the forward edge of the signal transition from off to on.
Run/Stop (PLC input-21)
• wired to a SPST toggle switch or latched plc relay contact
• starts the dryer on the forward edge of the signal transition from off to on.
• stops the dryer on the trailing edge of the signal transition from on to off.
Load/Unload Mode Select (PLC input 22)
• wired to a normally open SPST pushbutton switch or momentary PLC relay contact
• switches to load/unload mode on the forward edge of the signal transition from off to on.
Cycling Mode Select (PLC input 23)
• wired to a normally open SPST pushbutton switch or momentary PLC relay contact
• switches to cycling mode on the forward edge of the signal transition from off to on.
Auto Mode Select (PLC input 24)
• wired to a SPST toggle switch or latched plc relay contact
• Auto-Mode is enabled on the forward edge of the signal transition from off to on.
• Auto-Mode is disabled on the trailing edge of the signal transition from on to off.
NOTE: Proper noise consideration must be taken to avoid introducing noise into the control system. All switches
should have RC noise suppressors across the contacts. Wiring should be routed through metal conduits or shielded
cables grounded at the PLC chassis ground.