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Information on available spare parts: www.boschrexroth/spc
On/off valves with
spool position monitoring
RE 24830/03.08Replaces: 02.08
Table of contents
Content Page
General 2Switching logic
3 to 5
Directional poppet valve type SED  6Directional poppet valve type SEW
7Directional poppet valve types SH, SP, SMM, SMR 8Directional spool valve type WE 9 to 11
Directional shut-off valve type Z4WE 12Directional spool valve types WMM, WMR 13Directional spool valve types WH, WP 14Directional spool valve type WEH 15 to 17Directional spool valve type Z4WEH 18, 19Pinout
20 to 22
Mating connectors
23
o u r t e s y  o f  C M A /F l o d y n e /H y d r a d y n e  ▪ M o t i o n  C o n t r o l  ▪ H y d r a u l i c  ▪ P n e u m a t i c  ▪ E l e c t r i c a l  ▪ M e c h a n i c a l  ▪ (800) 426-5480 ▪ w w w .c m a f h .c o m
General
Inductive position switches and proximity sensors In the case of poppet valves, contact-free and floating posi-tion switches and proximity sensors (in the following referred to as position switches) switch shortly before reaching, and in the case of on/off after having reached, the position to be monitored. The position reached is indicated by a binary sig-nal.
Advantages of the position switches:– Short-circuit-proof
– Available with M12x1 plug-in connection
– Direct monitoring of the position on the control spool – Long service life
– High reliability, because no dynamic seals are used – Response time of the switch upon actuation ca. 15 ms. – The switching times according to ISO 6403 specified in the associated valve data sheets do not  correspond to the response times of the position switch (time from the signal change at the solenoid to the signal change of the position switch).
Time-based query mechanisms should be set to a mini-mum of 80 to 100 ms.
Attention!
Valves with inductive position switches and proximity sensors in safety-relevant controls may exclusively be installed and commissioned by specialists who have undergone relevant training in the fields of hydraulics and electrics! Adjustment and maintenance work requires special tools and fixtures. This work may only be carried out by authorized spcialists or in the factory!
Improper working on safety equipment involves risks of per-sonal injury and damage to property!
– The essential valve parts were matched to each other in the production plant and adjusted during assembly. They must not be interchanged. In the event of a defect of the valve or the position switch, the complete valve must be replaced!
– The factory setting of the position switch must not be
changed. The position switch may only be adjusted by the valve manufacturer.
– The machine control must monitor the position switch inde-pendently so that a new machine cycle cannot be initiated should the position switch fail.
– The machine control and the components must be selected so that leakage cannot result in an impermissible closing movement.
– On 4/2 directional poppet valves only the main valve, but not the complete valve function, is monitored.
o u r t e s y  o f  C M A /F l o d y n e /H y d r a d y n e  ▪ M o t i o n  C o n t r o l  ▪ H y d r a u l i c  ▪ P n e u m a t i c  ▪ E l e c t r i c a l  ▪ M e c h a n i c a l  ▪ (800) 426-5480 ▪ w w w .c m a f h .c o m
Switching logic: Inductive position switch type QM
Depending on the position to be monitored, the two switching outputs X1 and X2 assume the following function:
Variant QMA
(Solenoid on side “a“, monitored position “a“)Variant QMA
(Solenoid on side “b“, monitored position “a“)PIN 2 (X1)
PIN 4 (X2)
Spool stroke in % →
PIN 2 (X1)
PIN 4 (X2)
Spool stroke in % →
Variant QMB
(Solenoid on side “a“, monitored position “b“)Variant QMB
(Solenoid on side “b“, monitored position “b“)
PIN 2 (X1)
PIN 4 (X2)Spool stroke in % →
PIN 2 (X1)PIN 4 (X2)
Spool stroke in % →
Variant QM0
(Solenoid on side “a“, monitored rest position)Variant QM0
(Solenoid on side “b“, monitored rest position)PIN 2 (X1)
PIN 4 (X2)Spool stroke in % →
PIN 2 (X1)PIN 4 (X2)
Spool stroke in % →
o u r t e s y  o f  C M A /F l o d y n e /H y d r a d y n e  ▪ M o t i o n  C o n t r o l  ▪ H y d r a u l i c  ▪ P n e u m a t i c  ▪ E l e c t r i c a l  ▪ M e c h a n i c a l  ▪ (800) 426-5480 ▪ w w w .c m a f h .c o m
Switching logic: Inductive proximity sensor type QS
Depending on the position to be monitored, the two switching outputs X1 and X2 assume the following function:
Variant QSAG24W
(Solenoid on side “a“, monitored position “a“, switch on side “B“)Variant QSBG24W
(Solenoid on side “b“, monitored position “b“, switch on side “A“)PIN 2 (X1)
PIN 4 (X2)
← Spool stroke in %
PIN 2 (X1)
PIN 4 (X2)
Spool stroke in % →
Variant QS0G24W
(Solenoid on side “a“, monitored position “0“, switch on side “A“)Variant QS0G24W
(Solenoid on side “b“, monitored position “0“, switch on side “B“)PIN 2 (X1)
PIN 4 (X2)
← Spool stroke in % →
PIN 2 (X1)
PIN 4 (X2)
← Spool stroke in % →
Inductive proximity sensors of type QS are used to monitor reaching of the spool position. Valves with this proximity sen-sor are therefore not  suitable for use in safety applications!
Switching logic: Inductive position switch type QR
Depending on the position to be monitored, the two switching outputs X1 and X2 assume the following function:
Variant QR0
(Solenoid on side “a“, monitored position “0“)Variant QRAB
(Solenoid on side “a“, monitored position “a“ and “b“)
PIN 2 (X1)
PIN 4 (X2)
← Spool stroke in % →
PIN 2 (X1)
PIN 4 (X2)
← Spool stroke in % →
o u r t e s y  o f  C M A /F l o d y n e /H y d r a d y n e  ▪ M o t i o n  C o n t r o l  ▪ H y d r a u l i c  ▪ P n e u m a t i c  ▪ E l e c t r i c a l  ▪ M e c h a n i c a l  ▪ (800) 426-5480 ▪ w w w .c m a f h .c o m
Switching logic: Inductive proximity sensor type QS
Depending on the position to be monitored, the two switching outputs X1 and X2 assume the following function:
Variant QSABG24W
(Solenoid on side “a“, monitored position “a“ and “b“, switch on side “B“)Variant QSABG24W
(Solenoid on side “b“, monitored position “a“ and “b“,  switch on side “A“)
PIN 2 (X2)
PIN 4 (X1)
←Spool stroke in % →PIN 2 (X2)
PIN 4 (X1)
←Spool stroke in % →
Variant OF…QSAG24W
Solenoid on side “a“, monitored position “a“,  switch on side “B“)Variant OF…QSBG24W
(Solenoid on side “b“, monitored position “b“,
switch on side “A“)
PIN 2 (X1)
PIN 4 (X2)
←Spool stroke in % →
PIN 2 (X1)
PIN 4 (X2)
←Spool stroke in % →
Variant OF…QSABG24W
(Solenoid on side “a“, monitored position “a“ and
“b“,  switch on side “B“)
Variant OF…QSABG24W
(Solenoid on side “b“, monitored position “a“ and
“b“,  switch on side “A“)
PIN 2 (X1)
PIN 4 (X2)
←Spool stroke in % →
PIN 2 (X1)
PIN 4 (X2)
←Spool stroke in % →
Inductive proximity sensors of type QS are used to monitor
reaching of the spool position. Valves with this proximity sen-
sor are therefore not suitable for use in safety applications!
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