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Bosch Rexroth AG
VT-MSFA1 | RE 30260-B/07.12
Information on this product
5.2.3 Monitoring functions
It is the task of the booster amplifier monitoring functions to identify faults in the
system and in the solenoid conductors and to initiate the corresponding measures
in case of fault.
In case of fault, the output stage is deactivated. The "Ready for operation" output
(terminal 5) is switched off (high-impedance output > 20 kOhm) and the green
"Ready for operation" LED on the front side goes out.
The fault recognition monitors the following:
•
Undervoltage of +UB
•
Cable break of the solenoid conductors (terminal 7 and 8)
•
Short-circuit of the solenoid conductors (terminal 7 and 8)
•
Connection of a high-impedance valve solenoid (greater 5 Ohm)
If there is no fault, the green "Ready for operation" LED at the front side is illumi-
nated and the "Ready for operation" output is switched to +UB operating voltage.
If the value falls below the min. operating voltage u
B
(t)min, the required pull-in or
holding current can no longer be guaranteed. The output stage is deactivated, the
green "Ready for operation" LED at the front side goes out and the "Ready for
operation" output is switched off.
Only if u
B
(t)min is exceeded will the output stage be reactivated and the electron-
ics changes into the fault-free operating state.
Attention: After the cause of error has been remedied and a voltage greater
than / equal to the switch-on threshold has been applied to both switching
inputs "IN1" and "IN2" (2), the output stage will be immediately activated.
Afterwards, the electronics starts a new switching sequence.
As long as no valve or valve solenoid is connected at the booster amplifier, the
green "Ready for operation" LED remains off and the "Ready for operation"
output (terminal 5) remains switched off (high-impedance output > 20 kOhm).
5.3 Product identification
Fig. 3: Ordering code
Fault recognition (5)
Analog amplifier in modular design for controlling
a fast switching valve
for KSDER valve with coil 2.3 Ohm / 1.76 A
= 50
for 4SEC6...SO843 valve
= 100
for 4WE6...SO893 valve
= 150
Further details in the plain text
1X =
Series 10 to 19
(10 to 19: Unchanged technical data and pin assignment)
VT–MSFA1
1X V0 *
