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RFCavPlDrivers is a digital step motor driver connected to the LLRFDigPatch that is controlled by the LLRFProc for cavity plunger tuner.

General description

RFCavPlDrivers is a two-channel driver that includes two SRT8. This driver can handle up to 8A running current per phase, micro-stepping with high resolution, LED for fault diagnostics, and three digital interfaces (step, direction, and enable). It is configured to control a bipolar stepper motor. The enable interfaces actuate according to limit switches of the motor. It has a Beagle Bone Black that works as a digitizer for the DC signal from the motor-position potentiometers and the current sensors, and EPICS IOC (Input/Output Controller) server to provide these measurements for High-Level Application (HLA) through PVs (Process Variables). It includes +5V and +48V DC power supply. The simplified diagram with the main components and ports is shown in Fig. 1.

Figure 1: Cavity Plunger Drivers block diagram.

Versions Control

Table 1: RF-CavPlDrivers version control.
Version Date Description
V1I1 First assembly
V1I2 Changed internal components placement

The schematic, bill of materials, and all other files related to this crate can be found at:
\\centaurus\LNLS\Grupos\RF\Sirius DOC_TEC_RF\Sirius_DOC_TEC_RF\LLRF_Rack\Crates\Cav_Plunger_Drivers

Devices in use

Table 2: RF-CavPlDrivers devices.
Device # Version Device Name Location
001 V1I1 RA-RaBO01:RF-CavPlDrivers Booster LLRF Rack
002 V1I2 RA-RaSIA01:RF-CavPlDrivers Storage Ring A LLRF Rack

Crate Panels

Figure 2: Cavity Plunger Drivers front panel art.
Figure 3: Cavity Plunger Drivers rear panel art.

Device PVs

Table 3: RF-CavPlDrivers PVs.
PV Name Description
*:RF-CavPlDrivers:VoltPos5V-Mon 5V Voltage monitoring
*:RF-CavPlDrivers:Current5V-Mon 5V Current monitoring
*:RF-CavPlDrivers:VoltPos48V-Mon 48V Voltage monitoring
*:RF-CavPlDrivers:Dr1Enbl-Sel Driver 1 Enable Signal
*:RF-CavPlDrivers:Dr1Enbl-Sts Driver 1 Enable Readback
*:RF-CavPlDrivers:Dr1Flt-Mon Driver 1 Fault signal monitoring
*:RF-CavPlDrivers:Dr1Current-Mon Driver 1 Current monitoring
*:RF-CavPlDrivers:Dr2Enbl-Sel Driver 2 Enable Signal
*:RF-CavPlDrivers:Dr2Enbl-Sts Driver 2 Enable Readback
*:RF-CavPlDrivers:Dr2Flt-Mon Driver 2 Fault signal monitoring
*:RF-CavPlDrivers:Dr2Current-Mon Driver 2 Current monitoring