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The specified MTTFd values are subject to the limitations from RE 08012
(see "Exceptions/limitations" for "admissible spool design; maximum longitudinal
spool acceleration" in chapter "Proportional directional valves" on page 5).
The DC depends on the system and on the use of a safety PLC (see chapter 2.2
"Intended use").
By using the valves as intended, a CCF of at least 65 points can be reached.
2.7.5 Limits for the operation
The following operating conditions apply to the valves, see data sheet.
• Ambient temperature range: -20...60 °C
• Supply voltage range 18...36 VDC, see data sheet
• Additional external precautionary measures must be taken against overvoltage,
e.g. in the form of fuses and varistors.
Variations may occur depending on the valve used. They can be found in the
corresponding valve data sheet. There, you also find the valve-related operating
conditions.
2.7.6 Switch-off / switch-on times
The switch-off time generally depends on the valve type used and the hydraulic
operating state. The table below lists typical values below the performance limits.
The min. switch-on time results from the required run-up time of the electronics
(switching on of Class-B voltage) and the time it takes to respond to a command
value input with a change in current at the solenoid. It does not correspond to
a stable control position (the change in position of the spool is not taken into
account in the switch-on time).
Table 7: Typical switch-on and switch-off times
Valve type
4WRPEH6...-3X
4WRPEH10...-3X
4WRPE6...-3X
4WRPE10...-3X
4WRPE10_EA...-3X
4WRLE10...-4X
4WRLE16...-4X
4WRLE25/27...-4X
4WRLE35...-4X
RE 29118-B/09.2021; 4WRPEH6_3X, 4WRPEH10_3X, 4WRPE6_3X, 4WRPE10_3X, 4WRLE_4X; Bosch Rexroth AG
Switch-on time
Typical switch-off time
3 ms
< 15 ms
3 ms
< 20 ms
3 ms
< 30 ms
3 ms
< 45 ms
3 ms
< 45 ms
3 ms
< 50 ms
3 ms
< 50 ms
3 ms
< 50 ms
3 ms
< 200 ms
Safety instructions
17/44
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