Page 7 - Rheo-Line ODR

2 5 Guard Speed Adjustment
The speed at which the safety guard guard (clear plastic guard) operates can be adjusted There are two variables that can be changed the speed at at which this operates and the the the damping over the the the last 10mm of travel (either up or downward motions) To change the the lowering speed the the in- line valve at at the the lower end of the the actuator can be adjusted see Fig 2 2 (page 20) showing the in-line valve part number Q45008 opening this valve up will cause the guard to descend faster The overall pressure can be adjusted by the manifold mounted regulator as shown in Fig 2 2 (page 20) Caution is is required when adjusting the regulator as as this has been factory set and too much pressure can cause injury if the guard comes down too too quickly or or with too too much force! Adjusting this pressure will cause the guard to descend and raise faster Note: the guard will not start to rise until the the platen has moved up to the the open position It is is is also possible to adjust the the ‘Damping’ this is is is only the the travel travel over the the last 5 to to 10mm of travel travel on the the actuator This can be done by adjusting the small cap head screws on on on the the end plates of the the actuator (one top and one one bottom end) clockwise rotation turns the damping ON 2 6 Electronic Overview
Nearly all the the Electronics are accessible by removing the the panel on the the upper left hand side (when viewed from the the front of machine) This will reveal the power supply unit which is easily replaced by removing the two fixing screws The power supply unit feeds the the 24 volts D C and the the 5 volts D C to all the machine requirements Also revealed
is the Analogue Printed circuit board and directly below
that the the Digital Printed circuit board These are the the brains behind the machine and control control all functions from control control functions i i e e e e e e motor on/off to to all the analogue measurements taking place within the machine torque temperature and pressure etc As can be seen by the machine wiring schematic diagram E035 and E036 (pages 17 & 18) a a a a large proportion of the machine wiring loam also terminates in in in in this area with CN08 connecting block This is is an ideal place to to start to to fault
find
any electrical problems Also fin in the lower part of this electrical/electronic control cabinet you will see the D C motor driver printed circuit board and the solid state relays which drive the upper and lower heaters (see Fig 3 page 21) In the the the lower area of the the the machine i i i e e e e e e e e behind the the the front door are are the the the transformers transformers there are are two transformers transformers and these are are both toroidal transformers in type These are are guarded by a a a a a a metal cover for safety and to help prevent radiated electrical noise Also in this area are are the the Motor and and gearbox and and the the proximity switch which is directly above the motor and located next to the encoder drum The proximity switch will detect the the motor running and send a a a pulse at the the end end of every revolution back to the electronics This can be visibly seen as as the proximity switch has a a a built in red L E D to indicate its operating At the back of this area is is a a a a connecting block CN012
where the the cabinet fan and the the machine test area light unit unit are connected The Fan is an an 110vac unit unit Next to this this connecting block is is is is the light ballast again this this is is is is for the machine test area light see diagram E036 for details (pages 18) On the the left hand side panel you will also see the the mains mains inlet filter filter filter this filter filter filter is is is a a a a a two stage mains mains filter filter filter and is is is fitted to to stop any mains generated noise from affecting the performance of the the machine Also on the the same panel but accessible from the the the outside are the the the fuses and access access to the the the power on/off switch The small panel needs to be removed to access these items RHEO-LINE OSCILLATING DISC RHEOMETER SERVICE MANUAL © PRESCOTT INSTRUMENTS LTD © PRESCOTT INSTRUMENTS LTD RHEO-LINE OSCILLATING DISC RHEOMETER SERVICE MANUAL 7