Bosch Rexroth MAD - Page 56

Purge volume motor and tube
Frame size
Motor purge vol‐
ume [l]
Hose purge volume [l/m]
(Inner diameter hose d
i
= 8 mm)
100 4
0.05
130 6
160 10
180 15
225 19
Tab. 10-1: Table motor and hose volume
Total purge volume
The total purge volume is composed of the number of motors within the purg‐
ing cycle and the used tube length.
Example: 2 MAD130 motors with 20 meters connection hose.
V
ges
Total purge volume
n
M
Numbers of motors within purging cycle
V
M
Purge volume within the motor
n
S
Tube length within purging cycle (round up to complete meters)
V
S
Purge volume per meter tube
Fig. 10-1: Determine total purge volume
Minimum purge duration and mini‐
mum flow
Minimum flow and minimum purge duration can be set at the control device
of motor purging, if the total purge volume has been determined.
The purging power of the control device of Bartec is preset and is 68 l/min.
In any case, it is possible to limit the waiting time during acceleration up to
the operational state of the system, e.g. the minimum purging duration can be
set to 60 seconds and the minimum flow can be accordingly increased. How‐
ever, observe the performance of the purge device. If the minimum flow can‐
not be increased accordingly, inevitably increase the minimum purgimg dura‐
tion. Please refer to the following examples:
Setting minimum purging duration and minimum flow for pre-purging
Total purge volume [l]
Minimum purging duration
[s]
Minimum flow [l/min]
65
60 65
or
120 32.5
or
180 22
Tab. 10-2: Setting minimum purging duration and minimum flow for pre-purging
Bosch Rexroth AG DOK-MOTOR*-IDYN*A*EXPD-IB05-EN-P54/69
Rexroth MAD and MAF Motors in EX px d Design acc. to ATEX Directive 2014/34/EU
Commissioning