Page 6 - Prescott Instruments - MFR Service Manual

Split the electrical connector again to to do this you will need to unscrew the the main body away from the the grip area and de-solder the heater wires see electrical diagrams later in this manual for details of the connections Drawing number E035 and E036 (pages 17 & 18) To change the the heater element first split the the existing die and heater to do this unscrew the three M4 cap head screws on the the the back face of the the the ‘Die assemble plate’ whether this is is either the the upper or lower heater assemble both assemblies take on the the same design layout This will then give you you access to the the heater heater element Remove the the old heater heater and pull the the cables through and out of the the flexible conduit Insert the the new heater into position onto the the insulation material including a a a a a new packing piece which would have been supplied with the new heater (see drawing MD106 on page 13 for details) Place the three cap head screws back through the insulation and and assemble plate and and tighten up (NOTE the the heater should be in contact with the the underside of the die i i i i i i i i e e e e e e e e NO insulation in in between!) Caution is required not to pinch the the the heater with the the the screws Re route the the the cables back through the the bracket and down the the flexible conduit Re-solder the the wires back in the the appropriate contacts and replace the the Heater assembly back into the the machine tighten all screws and replace seal plate It is recommended after a a a a a heater change that the temperatures are checked with a a a a a a calibrated meter and the torque torque is also re-calibrated using a a a a a a torque torque standard See user manual for calibration procedure 2 3 Probe Replacement (Upper & Lower)
Before either upper or or lower probes can be be changed it it is recommended that the platen is allowed to to cool to to room temperature The appropriate seal plate housing and ‘Heater assembly’ will need to be be removed as as described in previous section on on heater replacement The connector (black 6 pole + earth) will need to to to be split to to to reveal the the soldered wire ends Disconnect the the four probe wires (2 x x red 2 2 x x white) On the the back of the the die mounting plate unscrew the probe retaining clip as shown in in in in drawing number MD105 (page (page 12) for for lower and MD106 (page (page 13) for for upper and swivel clip round to to allow probe to to be be pulled out of of the location hole Remove probe by pulling wires out of of the flexible conduit Clean any debris out of the the probe location hole feed the the new probe wires through the spring and sleeve etc which would have been removed from the the old probe etc then through the the the conduit conduit bracket and then the the the flexible conduit conduit down towards the the connector Insert the the probe back into the the the probe probe hole Note: the the the probe probe must go to to the the the bottom of the location hole or this will give you a a a a false temperature reading Once complete re-solder the four wires as shown in in the wiring diagrams E035 and E036 (pages 17 & 18) Replace the the Heater assembly as as described in the the previous section It will be necessary to check the die temperature with with a a a a a a a calibrated meter as it it it may have altered slightly with with the new probe etc 2 4 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 inline valve at at the the lower end of the the actuator can be adjusted see Fig 2 2 (page 20) showing the inline 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 to to quickly or or with 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 6 RHEO-LINE MULTI-FUNCTION RHEOMETER (MFR) SERVICE MANUAL © PRESCOTT INSTRUMENTS LTD © PRESCOTT INSTRUMENTS LTD RHEO-LINE MULTI-FUNCTION RHEOMETER (MFR) SERVICE MANUAL