Specifications

ELECTRICAL CHARACTERISTICS
INTRODUCTION
Moog’s many electrohydraulic valve designs employ a number of
different electrical connections. Mechanical Feedback Valves utilize
the simplest electrical connections, while Electrical Feedback
Valves can be more complex with different command signals,
supply voltages and techniques to monitor actual spool position
being employed.All Moog valves can be segmented into the
following categories:
MECHANICAL FEEDBACK VALVE
ELECTRICAL CHARACTERISTICS
Rated Current and Coil Resistance: The specified input of
either polarity to produce rated flow, expressed in milliamperes
(mA). Rated current is specified for a particular coil configuration
(differential, series, individual or parallel coils) and does not
include null basis current.
Mechanical Feedback Standard Electrical Configuration:
Standard electrical connections and electrical polarity for flow
out of left control port when viewing valve from pressure side
area are:
single coil: A+, B-; or C+, D-
series coil: tie B to C; A+, D-
parallel coils: tie A to C and B to D;
[A & C]+, [B & D]-
Valve Style Electrical Connection Command Signal
Mechanical Feedback Servovalve 4 pin Current
Electrical Feedback Servovalve 6+PE pin Voltage or Current
Direct Drive Servo-Proportional Valve 6+PE pin Voltage or Current
ServoJet
®
Servo-Proportional Valve 6+PE pin Voltage or Current
ServoJet
®
Servo-Proportional Valve 11+PE pin Voltage or Current
DDV Pilot Servo-Proportional Valve 6+PE pin Voltage or Current
DDV Pilot Servo-Proportional Valve 11+PE pin Voltage or Current
Coil Connections: A four pin electrical connector that mates
with a MS3106R14S-2S or equivalent is standard. All four coil
leads are available at the connector, allowing external connections
for signal, series, or parallel coil operation.
Servoamplifier: A Servovalve responds to input current.
Therefore, in order to reduce the effects of coil resistance
variations, a Servoamplifier with high internal impedance
(as obtained with current feedback) should be used.
Dither: A small amplitude, high frequency sinusoidal signal may
be used to reduce friction and hysteresis effects within the valve,
improving system performance. If used, the peak-to-peak ampli-
tude should be less than 10% of rated signal. Since the desired
frequency is dependent on the valve style, consult factory for
recommended frequency.
Coil Impedance: The two coils in each Servovalve are wound
for equal turns with a normal production tolerance on coil
resistance of ±12%. Copper magnet wire is used, resulting in a
coil resistance that will vary significantly with temperature.The
effects of coil resistance changes can be essentially eliminated
through the use of a current feedback Servoamplifier having high
output impedance.
Inductance is determined under pressurized operating condi-
tions and varies greatly with signal frequencies above 100 Hz.
Intrinsically Safe: Optional intrinsically safe designs are available
for most standard valve models.These designs have been granted
both entity and loop approval by Factory Mutual (FM), CSA and
Cenelec. Please consult factory for the latest CSA information on
hazardous location approvals.
ELECTRICAL CONNECTIONS
Connector MS3106R14S-2S
Connectors for Valve Opening A and C (+) A (+), D (-) A (+), B (-)
P ➧ B,A ➧ T B and D (-) B and C connected or C (+), D (-)
ABCD
ABCD
ABCD
Parallel Series Single
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