Bosch Rexroth Nexo - Particularities with VW-XML Results Output; Tightening Process

166/263 Bosch Rexroth AG | Tightening Technology
7.7.2 Particularities with VW-XML results output
The VW corporate requirement specifications "Controlled tightening systems" defines five tightening pro-
cesses. This section describes the necessary parameterizations of the relevant tightening programs as
well as their control functions in the NEXO-OS in order to satisfy the requirements of VW-XML.
Comparison of tightening step designations
The following configuration data of the nutrunner (under Settings  Configuration) are
implemented in the VW-XML results protocol:
7.7.3 Tightening process
The Nexo cordless Wi-Fi nutrunner does not offer pre-configured tightening program steps for the tight-
ening processes defined in the VW corporate requirement specifications (see chapter 2.3.2.3 in the VW
corporate requirement specifications). In order to detect the AD process or AW process in the output
VW-XML, the relevant tightening programs must satisfy certain requirements and have special character-
istics.
Tightening process torque (AD process)
Table 7–51 shows how the AD tightening process has to be parameterized in the Nexo cordless Wi-Fi
nutrunner.
VW corporate requirement specifications Nexo category of the tightening step
Start-up step Start
Finding step Function A
Waiting step Function B
Loosening step Tightening program not active
Pre-tightening step Preliminary torque
Final tightening Final torque
Parameter Implementation VW-XML
Code <PRC_SST><PAR><FAS><GRP><TYP>
Serial number <PRC_SST><PAR><FAS><GRP><SNR>
Channel name <PRC_SST><PAR><FAS><GRP><SBZ>
Table 7–51: Parameterization of the AD process
Function in NEXO-OS Parameter in NEXO-OS Parameter in VW corpo-
rate requirement specifi-
cations
Comments
1. Target function Torque Torque set value [T
A
]
2. Target function Angle Angle upper limit
(switching) [A
O
]
Speed Speed set value [n]
Torque threshold Torque threshold value [T
T
]
Torque min. value monitor-
ing
T– Lower tolerance torque [T–]
Torque max. value monitor-
ing
T+ Upper tolerance torque [T+]
Angle min. value monitoring A– Lower tolerance angle [A–]
Angle max. value monitoring A+ Upper tolerance angle [A+]
Time upper limit Time Upper tolerance time [t+]
Time lower limit Always fixedly assigned the
value "0"
Lower tolerance time [t-]