MAKING MODERN LIVING POSSIBLE
Electrical Installation
S51-1 Motor
Electrohydraulic Two-Position
Controls T1, T2, T7
powersolutions.danfoss.com
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Revision history Table of revisions
Date Changed Rev
August 2015 Converted to Danfoss layout BA
April 2007 First edition AA
2 11024964 • Rev BA • August 2015
Electrical Installation
Contents
Literature references
Product overview
Electrical installation
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7 literature references......................................................... 4
Latest version of technical literature.........................................................................................................................................4
Product image................................................................................................................................................................................... 5
Nomenclature....................................................................................................................................................................................5
Theory of operation.........................................................................................................................................................................6
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7............................................................................................. 6
PCOR................................................................................................................................................................................................ 6
T*CA................................................................................................................................................................................................. 6
T*D1, T*D2, T* D7........................................................................................................................................................................6
T*C2..................................................................................................................................................................................................6
Control operation T1**, T2**, T7**........................................................................................................................................6
Hydraulic schematics...................................................................................................................................................................... 7
Electrical specifications.................................................................................................................................................................. 7
Pinout....................................................................................................................................................................................................8
DIN 43650 connector.................................................................................................................................................................8
AMP Junior Power Timer connector.....................................................................................................................................8
Pin compatibility...............................................................................................................................................................................8
Pressure compensator logic......................................................................................................................................................... 9
Hydraulic brake pressure defeat............................................................................................................................................9
Electric brake pressure defeat................................................................................................................................................ 9
Mating connector.............................................................................................................................................................................9
DIN 43650 connector parts list...............................................................................................................................................9
AMP connector parts list.......................................................................................................................................................... 9
11024964 • Rev BA • August 2015 3
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Literature references
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7 literature references
Literature title Description Literature number
S51 and 51-1 Bent Axis Variable Displacement Motors
Technical Information
On/Off Functions Function Block User Manual Compliant function block
Latest version of technical literature
Danfoss product literature is online at: http://powersolutions.danfoss.com/literature/
Complete product electrical
and mechanical
specifications
set-up information
520L0440
11022918
4 11024964 • Rev BA • August 2015
5 1
R G L F M N J S T W Y P K V Z X
Electrical Installation
Product overview
Product image
Nomenclature
S51-1 model code
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Code M and N options
M Description N Description
T1 Electrohydraulic two-position
control, 12 Vdc, DIN Connector
T2 Electrohydraulic two-position
control, 24 Vdc, DIN Connector
T7 Electrohydraulic two-position
control, 12 Vdc, AMP®
Connector
D1 Electric brake pressure defeat,
12 Vdc, DIN Connector
CA With hydraulic brake pressure
defeat
C2 Without brake pressure defeat
D2 Electric brake pressure defeat,
24 Vdc, DIN Connector
CA With hydraulic brake pressure
defeat
C2 Without brake pressure defeat
D7 Electric brake pressure defeat,
12 Vdc, AMP Connector
CA With hydraulic brake pressure
defeat
C2 Without brake pressure defeat
Only certain control options for the S51-1 motor utilize the Electrohydraulic Two-Position Control. The
combination of the M and N modules define the motor control’s functionality. Please refer to the motor’s
nomenclature to determine if the motor is equipped with the proper option. The nomenclature can be
found on the motor’s nametag.
11024964 • Rev BA • August 2015 5
min.
12V/24V
max.
Displacement
Electrohydraulic
two-positioncontrol
PCOR start
setting range
Ramp <
10 [145]
130
[1890]
370 [5 370]
Pressure compensator
override bar, [psi]
P001 872E
Electrical Installation
Product overview
Theory of operation
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Displacement can be changed electrohydraulically under load from minimum displacement to maximum
displacement and vice versa, by using a solenoid. When the solenoid is energized the motor has
maximum displacement and the pressure compensator does not function.
Solenoid not energized = minimum displacement
•
Solenoid energized = maximum displacement
•
PCOR
The control can be overridden by Pressure Compensator Override (PCOR) using high loop pressure. When
the PCOR activates, the motor displacement increases toward maximum. Pressure ramp from PCOR start
pressure (with motor at minimum displacement) until maximum displacement is reached is less than 10
bar [145 psi]. This ensures optimal power utilization throughout the entire displacement range of the
motor. PCOR start pressure is adjustable from 110 to 370 bar [1600 to 5370 psi].
T*CA
Pressure compensator configuration: T*CA with hydraulic brake pressure defeat.
A shuttle valve ahead of the pressure compensator prevents operation in the deceleration direction
(when motor is running in pump mode). This is designed to prevent rapid or uncontrolled deceleration
while the vehicle/machine is slowing down. The shuttle valve must be controlled by a 2-line external
signal.
T*D1, T*D2, T* D7
Pressure compensator configuration: T*D1, T*D2, T* D7 with electric brake pressure defeat.
A solenoid-switched valve ahead of the pressure compensator prevents operation in the deceleration
direction (when motor is running in pump mode). This is designed to prevent rapid or uncontrolled
deceleration while the vehicle/machine is slowing down. The solenoid valve must be controlled by an
external electric signal, based on direction of motor rotation.
T*C2
Pressure compensator configuration: T*C2 without brake pressure defeat
Pressure compensator functions when the motor is running in motor mode as well as in pump
(deceleration) mode.
Control operation T1**, T2**, T7**
6 11024964 • Rev BA • August 2015
W
n
T3
min.
disp.
M4
L1
N
L2
A
B
M3
T3
M3
T3
M3
P001 784E
XB
XA
with Electric
brake pressure
defeat
with Hydraulic
brake pressure
defeat
without
Brake pressure
defeat
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Product overview
Warning
Unintended vehicle or machine movement hazard. The loss of hydrostatic drive line power, in any mode
of operation (forward, neutral, or reverse) may cause the system to lose hydrostatic braking capacity. You
must provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold the
vehicle or machine in the event of hydrostatic drive power loss.
Hydraulic schematics
Circuit diagram – motor with electrohydraulic two-position control T1**, T2**, T7**
Electrical specifications
Ports:
Two-position solenoid
M-option
Voltage
Rated power
Electric brake pressure defeat solenoid
N-option
Voltage
Rated power
11024964 • Rev BA • August 2015 7
A, B = Main pressure lines
L1, L2 = Drain lines
M3, M4 = Gauge port servo pressure
XA, XB = Control pressure ports, brake pressure defeat
T3 = Optional orifices
N = Speed sensor
T1, T7 T2
12 Vdc 24 Vdc
34 W 34 W
D1, D7 D2
12 Vdc 24 Vdc
34 W 34 W
1 2
2 1
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Electrical installation
Pinout
DIN 43650 connector
Pin location
Pinout
Pin Function
1 PWM signal
2 Ground
Pinout (alternative)
Pin Function
1 Ground
2 PWM signal
Pin compatibility
AMP Junior Power Timer connector
Pin location
Pinout
Pin Function
1 PWM signal
2 Ground
Pinout (alternative)
Pin Function
1 Ground
2 PWM signal
PLUS+1® module pin type/ Two-position solenoid
Pin Function
1,2 DOUT
1,2 DOUT/PVG Power
1,2 PWMOUT/DOUT/PVG Power supply
1,2 PWMOUT/DOUT/PVGOUT
1,2 Power ground -
8 11024964 • Rev BA • August 2015
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
Electrical installation
PLUS+1® module pin type/ Electric brake pressure defeat solenoid
Pin Function
1,2 DOUT
1,2 DOUT/PVG Power
1,2 PWMOUT/DOUT/PVG Power supply
1,2 PWMOUT/DOUT/PVGOUT
1,2 Power ground -
Pressure compensator logic
Hydraulic brake pressure defeat
Motor rotation High pressure port Control pressure on port*PCOR function
CW A XA yes
CW A XB no
CCW B XA no
CCW B XB yes
*
Differencial control pressure between port XA/XB:
∆p
= 0.5 bar [7 psi]
min
∆p
= 50 bar [725 psi]
max
Mating connector
Electric brake pressure defeat
Rotation High pressure port Solenoid PCOR function
CW A Energized Yes
CW A Non-energized No
CCW B Energized No
CCW B Non-energized Yes
DIN 43650 connector parts list
Description Quantity Ordering Number
DIN 43650 connector 1 Hirschmann 932 106-100
Mating connector kit 1 Danfoss K09129
AMP connector parts list
Description Quantity Ordering number
Two pin connector 1 Tyco Electronics 282189-1
Contacts 2 Tyco Electronics 929940-1
Seal plugs 2 Tyco Electronics 828904-1
Mating connector kit 1 Danfoss K19815
11024964 • Rev BA • August 2015 9
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
10 11024964 • Rev BA • August 2015
Electrical Installation S51-1 Electrohydraulic Two-Position Controls T1, T2, T7
11024964 • Rev BA • August 2015 11
Danfoss
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Phone: +49 4321 871 0
Danfoss
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Phone: +45 7488 2222
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Phone: +86 21 3418 5200
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www.comatrol.com
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www.daikin-sauer-danfoss.com
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