Details on mechanics (integral)

The probe is capable of a fast motion (1m/s) and it is hazardous to access or to introduce something inside the device, under the altuglass covers, or to dismount a cover. It is also hazardous to manipulate the motor shaft (see "Shed access and safety" above). To do it safely, the user must first turn off the motor power box. The power box is located under the motor. It has two external switches: one controlling the logics and one controlling the power:

                     Logics switch 

                            | 

(TOP VIEW)                  | 

                            V  

.                        ----    -------------- 

.                       |       |  |   $<-$---DIPOLE---$->$   | 

.           Power box-$->$|       |  |                           | 

DOOR$<-$-                |    MOTOR-|                           | 

.                       |       |$<-$-Power switch              | 

.                       |       |  |                           | 

.                        ----    -------------- 

It is important NOT to switch off the logics (some data in memory will be lost), but to switch off the motor power (see the exact Power switch location above) prior to any intervention on the mechanics. The detailed procedure is the following:

-turn OFF the power switch

-wait for 1min to empty its buffer-capacitor

-you can work safely on the mechanics

-make sure that the path of the probe is free (tools...) and the covers are in position

-turn the power switch back ON

-reboot the VME (see "Integral ioc reboot" above)

The above procedure may be necessary if, for some reason, the probe went outside its allowed range limited by a pair of electric limit switches. The probe range is limited by the following set of devices:

-upstream energy damper for Zd in [-40.,-14.mm]

-upstream electric limit switch for Zd$<-$7.5mm

-upstream optic limit switch for Zd$<-$3.8mm

(operation range, 3.2m long)

-downstream optic limit switch for Zd>3200.8mm

-downstream electric limit switch for Zd>3212.3mm

-downstream energy damper for Zd in [3214.,3238.mm]

The current status of the 4 limit switches is given in the "arc-master.adl" screen. Optical limit switches are used for the encoder initialization procedure (see "Summary of field integral" above). Electric limit switches should never be activated. But if this happens, then the motor control:

-stops the motor

-raises an error flag (the letted "d" for defect is displayed inside the power box, the usual display being a vertical segment)

-waits for a manual repositioning of the probe inside its allowed range and for a reboot of the VME.

The manual repositioning of the probe inside its allowed range can be done safely by manipulating the motor shaft while the motor power is off, according to the above procedure.