Bosch Rexroth 4WRPD Operating Instructions Manual page 18

18/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
2.7.5 Limits for operation
The following operating conditions apply to the valve, see data sheet.
• Ambient temperature range: -20...60 °C
• Supply voltage range 18...36 VDC, see data sheet.
• Voltage range of the enable inputs 0...+36 VDC. Additional external precautionary
measures must be taken against overvoltage, e.g. in the form of fuses and
varistors.
• Level recognition of the enable inputs according to IEC 61131-2:2008, type 1
• The enable acknowledgement outputs must be connected to switching inputs
according to IEC 61131-2:2008 (types 1, 2 or 3; current sinking).
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 Independence of operating modes
The safety function of the valve with Multi-Ethernet electronics is independent
of the operating modes. However, the safety function can only be used if the
Multi-Ethernet electronics are combined with suitable valve functions (e.g. spool
overlap). The relevant information can be found in the corresponding valve data
sheet. The data sheets also list, which operation modes are supported by the
Multi-Ethernet electronics together with the valve.
2.7.7 Switch-off time
The switch-off time generally depends on the valve type used and the hydraulic
operating state. The following table lists typical values below the power limit. The
min. switch-on time results from linking of solenoid enable and position. For this
reason, only the electrical part is relevant.