M-system PSN1, PSN3 Instruction Manual

INSTRUCTION MANUAL

SERVO-TOP II ELECTRONIC ACTUATOR

(linear type)

BEFORE USE ....

Thank you for choosing M-System. Before use, please check
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.

■ SAFETY PRECAUTIONS

Before use, please read all the following precautions care­fully to ensure the safety. These safety precautions, classi­fied into “WARNING” and “CAUTION” according to the de­gree of damage that each item could cause, are imperative
to prevent an accident. After reading, be sure to keep this
manual always in a visible and accessible place for the user.

WARNING Suggesting that failure to observe the pre-

cautions could result in death or serious personal injury.

CAUTION Suggesting that failure to observe the pre­cautions could result in personal injury or damage to the
property.

WARNING

Be sure to replace the terminal box cover which houses
the power input terminals on before turning on the power
supply. It could cause electric shock.

Power fuse: A glass tube power fuse (5.2 dia × 20 mm)
of the rating as shown below is incorporated for safety.
Be sure to remove the power supply before replacing it.
Replacing the fuse without turning off the power supply
could cause electric shock.
AC power: Medium time lag, M 3A 250V
DC power: Medium time lag, M 4A 125V

Remove power supply to the actuator before wiring to it.
It could cause electric shock.

DO NOT loosen the set screw fixing the lever of angle sen­sor. Loosening it may cause a malfunction. It could cause
electric shock, burn, and injuries.

DO NOT step onto the actuator. DO NOT rest a heavy
object on or against it. It could cause injury.

When installing the PSN outdoor or where it is exposed
to rain or water drops, adequate precaution must be done
for preventing water from entering inside through wiring
conduits. It could cause electric shock.

DO NOT mount the PSN in such direction that the output
stem is at the top of the actuator. It could cause electric
shock.

Be surer that the power supply is removed. Hand or arm
could be caught and cause injury.

When the operation is completed, be sure to remove the
handle and cover the stem with a rubber cap. Hand or
arm could be caught and cause injury.

Inside the cover, the metal plate mounting printed wir­ing boards located above the motor is also installed for
heat dissipation. The motor and the plate may become ex­tremely hot during operation. DO NOT touch them with
bare hands. It could cause burn injury.

The adjustments which are paint locked are for factory
use only and should be changed only by qualified M-Sys­tem personnel. M-System is not liable for any malfunc­tion or inconvenience caused by unauthorized change of
them by the user. Otherwise it could cause breakdown.

■ PACKAGE INCLUDES:

SERVO-TOP II body ...........................................................(1)

Indicator (when the stem button is selected;

attached to the actuator body with a Scotch tape) ............(1)

Note: Yoke and other components necessary to attach the

PSN to a valve are to be provided by the customer.

■ MODEL NO.

Confirm Model No. marking on the product to be exactly
what you ordered.

■ INSTRUCTION MANUAL

This manual describes necessary points of caution when
you use this product, including installation and connection,
hardware setting, and basic maintenance procedures.
With the emergency shutdown option selected, please also
refer to PSN1/PSN3 Instruction Manual for this option
(EM-4857-A).
When you need to change software settings, please refer to
the Operation Manual for Model PU-2x (EM-9255), Section
B. This unit is factory adjusted and calibrated according to
the Ordering Information included in the product package.
If you do not need to change the pre-adjusted setting, you
can skip the sections on PU-2x programming in this manual
and the Operation Manual for Model PU-2x.

MODEL

CAUTION

PSN1/PSN3

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-4857 Rev.10 P. 1 / 9

POINTS OF CAUTION

■ CONFORMITY WITH EU DIRECTIVES

• This equipment is suitable for Pollution Degree 2 and
Installation Category II (transient voltage 2500V). Re­inforced insulation (Signal or metallic housing or seq.
signals or battery status (with failsafe function only) to
power: 300V) is maintained. Prior to installation, check
that the insulation class of this unit satisfies the system
requirements.

• Altitude up to 2000 meters.

• The equipment must be installed such that appropriate
clearance and creepage distances are maintained to con­form to CE requirements. Failure to observe these re­quirements may invalidate the CE conformance.

• Install lightning surge protectors for those wires connect­ed to remote location. Refer to “LIGHTNING SURGE
PROTECTION” section below.

■ POWER INPUT RATING & OPERATIONAL RANGE

• Locate the power input rating marked on the product and
confirm its operational range as indicated below:

100 – 120V AC rating: 90 – 132V, 47 – 66 Hz,
approx. 240VA (200VA for PSN3)
200 – 240V AC rating: 180 – 264V, 47 – 66 Hz,
approx. 240VA (200VA for PSN3)
24V DC rating: 24V ±10%, approx. 3A

PSN1 / PSN3

■ SCREW TORQUE

• The torque for tightening screws for the cover is between

2.4 – 3.1 N·m (1.8 – 2.3 ft·lb).

■ DESIGNING YOKE

• When a foreign object is caught in the valve, a thrust as
great as 7500 N (1686 lb) could be applied to the yoke.
Observe enough strength when designing mechanical
components such like the yoke.

• When the PSN is used on a steam stream in temperature
control, its temperature may rise beyond ambient tem­perature caused by a heat conducted or radiated from pip­ing. Use a longer yoke for effective heat dissipation and
apply insulation material.

■ OPERATING CONDITION

• Depending on operating condition, internal temperature
may rise extremely high.

• When operating continuously with such a condition, it
causes short life span or damage and may impair expect­ed performance.

• Operate with an enough margin such as shortening the
operational duty time ratio.

■ GENERAL PRECAUTIONS

• DO NOT install signal wires and power supply wires to­gether in one duct because it may cause a malfunction
due to inductive noises. If they must be installed togeth­er, use shielded cables.

• If input signals are to be turned on/off with power sup­plied to the actuator, be sure to set the abnormal low in­put operation mode.

■ ENVIRONMENT

• Inside building. If outside, keep away from direct sun­light.

• Operating temperature -25 to +55°C (-13 to +131°F) for
PSN1; -15 to +55°C (5 to 131°F) for PSN3.

• Operating humidity 30 to 85% RH (non-condensing)

• Vibration 2 G (19.6 m/s

2

) max.

• The actuator must be installed in a place where mainte­nance and inspection can be conducted. Observe at least
15 cm (5.9 in.) of open space at the top of its cover for
maintenance and inspection.

• Keep away from hazardous atmosphere such like explo­sive or corrosive gases.

■ SOUND ACCOMPANYING MOTOR ROTATION

• The PSN’s stepping motor inherently generates whistling
sound during normal operation according to its rotating
frequency, larger with lower frequencies. DO NOT be
alarmed.

■ PID CONTROL SIGNAL

• Choose PID parameters carefully so that the MV remains
as stable as possible. Unstable control shortens the life of
actuator and valve.

■ GASKET

• Be sure to return the gasket when you close the cover
after wiring or adjustments.

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-4857 Rev.10 P. 2 / 9

COMPONENT IDENTIFICATION

Stepping Motor

Temperature Sensor

Modular Jack

Control PCB

PSN1 / PSN3

Input Resistor (for current input)

SW-1 –8

Manual Operation

Angle Sensor

Sealing Spring

Ground
Terminal

Gasket

FUSE

POWER
INPUT
ALARM
UP
DOWN

1
2

U(+)

POWER

V(–)

1 EXTEND / RETRACT
2 ACCORDING TO SW1 / STOP
3 REVERSE / DIRECT
4
5 RETRACTED POSITION SET
6 EXTENDED POSITIN SET
7
8 RUN / PU

POWER
INPUT
ALARM

UP
(RETRACT)

DOWN
(EXTEND)

OPEN / CLOSE

SEQUENTIAL

INPUT

SIGNAL

POSITION

SIGNAL

FORCED

COMMAND

CONTROL

+

COM1

+

RETRACT

EXTEND

OPEN / CLOSE SIGNAL

RETRACTED

OPEN / CLOSE SIGNAL

EXTENDED

ALARM

COM2

COM1

12

3
4

5
6

7
8

9
10
11

Fuse

: Power LED (green LED turns on when applied)
: Input LED (green LED turns on when applied)
: Alarm LED (red LED turns on with alarm)
: UP Control Button
: DOWN Control Button

Output Stem

Figure 1. Component Identication

OUTPUT STROKE & ADJUSTABLE RANGE

The servo-control PCB compares input signal (position set­point signal) and actual position signal from the position
sensor, and drives the motor to reduce the deviation.
When a full-close signal is provided, the output stem is
pressed onto the sealing spring after the valve is fully
closed, until the sealing pressure reaches a preset value.

MODEL L (mm) L (inch)

PSN1-4x1 66 to 106 2.60 to 4.17
PSN1-4x2 52 to 92 2.05 to 3.62
PSN3-6x1 66 to 126 2.60 to 4.96
PSN3-6x2 52 to 112 2.05 to 4.41

Yoke Surface

L

Figure 2. Operational Range of the Output Stem

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-4857 Rev.10 P. 3 / 9