Mitsubishi Electric LE-50PAU User manual

POWER AMPLIFIER
MODEL LE-50PAU
TENSION CONTROLLER
MODEL LE-50PAU-SET
INSTRUCTION MANUAL
Read through this manual, and use the unit correctly.
Make sure to understand “ Cautions on safety “ completely.
Store this manual carefully, and make sure to sent it to the end user.
©2010 MITSUBISHI ELECTRIC CORPORATION
This manual confers no industrial property rights or any rights of any other kind, nor does it confer
any patent licenses.
Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial
property rights which may occur as a result of using the contents noted in this manual.

Cautions on Safety
(Make sure to read this page before using the unit .)
In this manual , cautions of safety are classified into " WARNING "
and "CA UTION". Even an item is classified as "CAUTION", its contents are
important and it may lead to a serious result depend ing on the
situation. Make sure to observe every item .
CAUTION
• We shall not be respon sible for any damage caused by repair , disass embly, modification, etc . performed
by a third party other than MITSUBISHI or a company specified by MITSUBISHI .
• The cautions on safety and the specifications desc ribed in the instruction manua l are subject to change
without notice .
Never use the unit in an atmosphere where
inflammation or explosion can occur .
Otherwise, inflammation or explosion may occur .
Set up the emergency stop c ircuit
independen tly of the product .
Otherwise,theunitmaybecomeoutoforderandan
accident may occur when malfunction occurs in the
tension controller. Make sure to assemble the
emergency stop circuit outside the tension controller .
Do not use any unused terminals for any
external lines.
Correctly connect the AC power cable to the specified
terminal, and do not use any unused terminals for any
external lines. Improper connection may seriously
damage the produ ct .
Never touch a switch with a wet hand .
Never touch a switch with a wet hand , otherwise,
electrical shock may occur.
Never drop cutting chips and wire chips
whi le sc rew hol es are tapped and wi ri ng
work is performed.
Damage , fume , fire, malfunction or others may be
caused in the unit .
Confirm the ambient enviroments .
Never install the unit with an enviroment where dusts , soot,
conductive dusts or corrosive gas is present or a place
ex posed to high temperature , conden sation or wind and
rain. Otherwise, the unit may be damaged , malfunction or
be deteriorated .
Never open the covers while the power is
supplied to the unit or when the unit is
operating .
Never supply the power to the unit nor operate the unit
while the main body cover and the terminal cover are
open . W hen the covers are open , a high voltage area
may be exposed and electrical shock may occur . Separate the wiring of the strong electric
sys tem from the wiring of the weak electric
system.
CAUTION
Separate the wiring of the strong electric sys tem from the
wiring of the weak electric sys tem , and make sure that
noises are not supe rimposed on the wiring of the weak
electric sys tem. Otherwise, the unit may not ope rate
correctly.
Never modify nor disassemble the unit
Never modify nor dis ass emble the unit . Otherwise, the
unit may become defective or an accident such as fire ,
damage , etc. may occ ur.
Use the wire size suitable to the current capacity to
supply the power to the load . If a wire having smaller
current capacity is used,the insulation sheath will be
melted and insulation will become defective . In this
situation, electrical shock or a short-circuit may occur,
and fire may occ ur .
To assure safety
•Make sure the user thoroughly read this instruction manual
before using the unit , and pay attention in ass uring safety
while using the unit.
• The unit is manu factured unde r the severe quality control .
When a severe accident or loss is expected in the
equipment used due to failure of the unit , provide a back up
function or the fail -safe function in the sys tem .
WA RNI NG
:
CAUTION:
When the unit is handled incorrectly , a
dange rous situation may occ ur and the
possibility of death or serious injury is
expected.
When the unit is handled incorrectly , a
dange rous situation may occ ur and the
possibility of medium or slight injury is
expected or property damage exclusively
is expected.
Turn off all the phases of the external power
supply before starting installation and wiring .
Otherwise, electrical shock or damage in the unit may
occur. Make sure to turn off all the phases of the
external power supply before starting installation and
wiring.
P erform ground ing ( ground i ng regis tance
100 Ωor less).
Otherwise, electrical shock may occur. Perform
gr ound ing ( ground i ng regis tance 100 Ωor less) to the
unit using a wire of 2 mm2or more, otherwise, electrical
shock may occur. Never share the grounding with a
strong electric sys tem.
CAUTION
CAUTION
WAR NING
WAR NING
WAR NING
WAR NING
WAR NING
WAR NING
WAR NING
WAR NING
WAR NING
Design the install ation plan using the wir e
size suitable to the current capacity .

1
CHAPTER-1
POWER AMPLIFIRE / MANUAL POWER
SOURCE ----------------------------------------------- 2
1. General description
1.1 Features / applications -------------------- 3
1.2 General description of the unit----------- 5
2. General description of function
2.1 Description of operation ------------------- 6
2.2 Eqivalent block diagram ------------------- 8
3. Specifications
3.1 Outside dimension-------------------------- 9
3.2 Input / output specifications -------------- 10
3.3 Environmental specifications------------- 10
3.4 Set item list ----------------------------------- 10
4. Installation / wiring
4.1 Installation dimension / wiring work ---- 11
4.2 Connection of power circuit -------------- 12
4.3 Connection of input circuit ---------------- 13
4.4 Connection of output circuit -------------- 14
5. Initial setting
5.1 Setting procedure / Input signal level ------15
5.2 Non-linear compensation ----------------- 16
6. Maintenance / inspection
6.1 Initial inspection / Fault inspection------ 17
6.2 Maintenance inspection ------------------- 18
7. Supplementary items
7.1 Special setting operation------------------- 19
7.2 Clutch / brake characteristics ------------- 21
7.3 Manual power source with no
variable resistor ---------- 23
CHAPTER-2
WINDING DIAMETER DETECTION TYPE
SEMI-AUTOMATIC TENSION
CONTROLLER -------------------------------------- 24
1. General description
1.1 Principle of winding diameter detection- 25
1.2 Additional function of power amplifire--- 26
2. General description of function
2.1 Description of
additional function operation-------- 27
2.2 Eqivalent block diagram -------------------- 28
3. Operator panel
3.1 Introduction / Set item list ------------------ 29
3.2 Installation and Outline / Specification -- 30
4. Practical operation
4.1 Setting of winding diameter
/ taper ratio --------- 31
4.2 Speed / thickness setting------------------- 32
4.3 Tension / torque setting--------------------- 33
4.4 Error check------------------------------------- 34
5. Supplementary items
5.1 Panel design example
( external variable resistor )----------- 35
5.2 Panel design example
( built-in variable resistor )------------ 36
5.3 Setting of basic function -------------------- 37
6. Supplementary description ---------- 38
Table of Contents

2
This chapter described the handling procedue of LE-5-PAU power amplifier for cases with it is used as a
power amplifier itsself by using each tension control unit in combination and when it is used as a manual
power source, using the valuable resistor.
For case when the power amplifier is used as a winding diameter detection type semi-automatic tension
contorl unit by using the LE-5AP operator panel in combination, refer to the description given in dhapter-2.
The power amplifier is used to control the excitation current of powder clutch / brake and hysteresis clutch
/ brake, depending on the input signal voltage.
The contorl system used comes in “Voltage control system” by output voltage feedback and “Current contorl
system” by outpuf current feedback.
The power amplifier of this type is applicable to both systems, however, it is generally recommended to use
it by the current control system.
The power amplifier is incorporated with such function as to compensate the non-linearity of transmission
torque characteristic against excitation current for clutch / brake, and is suitable to the execution of correct
tension control.
LE-50PAU
CHAPTER-1 POWER AMPLIFIER / MANUAL POWER SOURCE

3
1.1 Features / applications
The LE-50PAU power amplifier is used to control the excitation current of the excitation coil for clutch / brake
such as powder clutch / brake, hysteresis clutch / brake, etc.
The power amplifier is applicable mainly to the winding / unwinding tension contorl for long-size material,
torque limiter for general machinery, etc.
The power amplifier si operative on wide range power source of 85VAC ~ 264VAC and is provided with con-
trol output of 24VDC, 4A or less anda aux. Power output of 10VDC, 2.0A, 10sec rating.
<Current / voltage contorl system >
• The clutch / brake may have resistance fluctuation of approx. 20% against the excitation coil tem-
perature fluctuation of 50 °C. Consequently, it is necessary for the open-loop type control to control
the exitation current not to contorl the voltage.
• The powe amplifier is designed as to be able to snsure the output current of 0~Imax against the
input sinal voltage of 0~Vmax. The input signal level ( Vmax ) is adjusutable to 0.5~8V, and the full-
scale output ( Imax ) to 0.2~4A respectively.
• For the closed-loop type control. the voltage control system is applicable without problem, as the
command input is compensated sutomatically even if any temperature fluctuation occurs in the
clutch / brake. (The adoption of current control system will be idealisitc for reduction of control error.)
• Particularly for the application in which the current distribution is adjusted by the variable resistor
with multiple clutch / brakes connected to one power amplifire, the use of voltage control method
will facilitate the adjustment operation.
The power amplifier is also disigned as to use the voltage control method for this purpose.
< Non-linearity compensation >
• The power amplifier is provided with such function as to compensate the non-linearity characteristic
of transmission torque of the excitation current for clutch / brake by 5-stage polygonal approxima-
tion, which can ensure the transmission torque proportional to the input signal voltage.
• The characteristic is an essential function for the open-loop type control, while it is also an essential
function for the closed-loop type control to reduce the control error, or to execute the internal taper
control.
• The internal taper control is such a control that the winding diameter is found by calculating it in-
versely from the output current ( or transmission torque ) to reduce the setting tension automatically
along with the increase of winding diameter.
< Built-in setting / display function >
• To allow the input signal level, output full-scale value, non-linearity data, etc. to be readily set, the
power amplifier is incorporated with a 4-digit / 7-segment display unit, 4 key switches and 10-pole
DIP switch.
• It is also possible to execute the inertia compensation or output monitor display, using this function
during baking.
Main ffeatures
1. General description

4
< Power amplifier for tension control >
• The power amplifire is used in combination with the closed-loop type tension control unit such as
LE-40MTA-E, LE-40MTB-E, LE-30CTN, etc. tension control unit to amplify the output signal or such
control unit, and to apply the power source to the excitation coil of clutch / brake.
< Manual power source, using external setting type valuable resistor >
• The power amplifier will appear to be a variable current ( or variable voltage ) power source, using
manual operation simply by connecting the variable resistor (8V, 2kW ) to the imput terminal of this
power amplifier.
Since the non-linearity compensation is executed, the opration is easy.
< Semi-automatic tension control unit >
• As described in chapter-2 of this manual, the power amplifier can be also used as semi-automatic
tension control unit by using the LE-5AP operator panel in combination.
• the semi-automatic tension control unit is provided with winding diameter detection function whitch
is intended to ensure the desired tension by controlling the output current automatically in accor-
dance with the winding diameter. It can ensure the simplified open-loop control in whitch no tension
tetector is used.
• Using the LE-5AP operator panel described previously will also allow the basic characteristeic of
power amplifier to be set easily.
Main applications

5
1.2 General description of the unit
The LE-50PAU power amplifire is a compact typeunit designed to be incorporated in the panel, using alu-
minum die cast and plastic cover.
(1) : Mounting holes arranged at four corners of the main unit, used to fix the unit within the control panel.
(2) : Transparent cover prepared for display unit and operation key.
(3) : 4-digid red 7-segnent display unit used to display the output current / voltage, or to execute each
setting operation.
(4) : operation key used to set the input signal level, non-linearity data, stop gain, stop bias, stop timer,
etc.
(5) : Side cover.
(5)’ : Side cover.
(6) : Panel cover. Each cover can be opend by inserting the pawl in the position marked with arrowhead.
(7) : Transparent cover for terminal block.
(8) : Termanal block for input / output and power source. When the right / left mounting screw ara loos-
ened evenly, it is possible to remove the entire terminal block.
(9) : Small window cover for DIP switch. The cover is opend, to see the DIP switch. The DIP switch is
used to set each mode or full-scale value of output current.
(10): Type LE-5AP operator panel connecting connector. The cable is connected by opening the side
cover (5).
(11): LED used to display the power source and cach status.
L N SN SG RS SN RC SN PN PP
SET SP SN ST SC PL 12V S2 S1



POWER
CV
CC
RC
POWER AMPLIFIER LE-50PAU
MODE INCSDECTSET
10987654321
ON
(1)
(2) (3) (4)
(1)
(5)
(6)
(1)
(7)(8)
(1)
(9)
(10)
(5)’
(11)

6
2.1 Description of operation
The internal block diagram of LE-50PAU power amplifier is as shown in page 8.
• SW1
Keep the SW1 turned on all times under the power amplifier mode and manual power mode.
( For case to turn it off, refer to the chapter-2.)
• SW2, SW3
These switches are prepared to set the input signal level, and are as shown at following table.
If the SW2 has been turnded on, it is readily possible to select 0 ~ 5V or 0 ~ 8V.
• SW4 ~ SW10
These switch are used to determin the full-scale value of output current.
When the SW5 ~ SW9 are turned on, for example, the full-scale value of output current will be
3.6A. Select the rated current, depending on the type name of clutch / brake used in combination.
Note that the 24VDC voltage output mode is set when all DIP switches (SW4 ~ SW10) are turned
on.
• The ON / OFF status of each SW is read when the power source is turned from off to on.
Even if the switch is changed over while the power source is turned on, the function remains invalid
until the power source is turned from off to on again.
• The signal voltage input to across input terminals [SA] - [SN] is output to the clutch / brake through the
amplifires A1, A2, A3.
• The amplifire A1 is prepared to set the input signal level.
“Vmax” is set to 5V, 8V, or 5 ~ 8V, using the DIP switches SW2 and SW3.
1. Role of DIP switch
11023456 789
4.0 2.0 1.0 0.8 0.4 0.2 0.1
24VDC voltage mode when
all switchs are turned ON.
Input mode
Operation mode
Setting current (A)
SW No.
ON
OFF
Set to ON
Output current
integer value
Output current
decimal value
SW.1 Operation mode
ON Power amplifier
OFF Semi-automatic tension control(See chapter-2)
SW.2 SW.3 Input mode
ON Input voltage ( 0~5V ) When use for power amplifier
OFF
ON
OFF
ON
OFF
Input voltage ( 0~8V ) When use for manual power source
Input voltage ( 0~Vmax ) ( Vmax = 0~5V ) free-mode
Special mode
2. Description of internal circuit
2. General description of function

7
• The amplifire A4 is used to set the output signal full-scale value (Imax), using the DIP switches SW4 ~
SW10.
Note that the 24VDC voltage output mode is set when all DIP switches (SW4 ~ SW10) are turned on.
• The amplifire A2 is used to add the stop gain and the stop bias to the output.
When the [ST] input is turned off, the stop gain (multiplication of output at the [ST] input ON by 0
~300%) and the stop bisa (addition of 0 ~ 60 % of full-scale output ) are valiated.
The upper limit times is restricted by the built-in stop timer.
• When the [RC] input is turned off, the [PP] - {PN] output is also turned off.
The [RC] input is generally used whil it is turnedon.
It is also possible to inver the logic so that the output is validated when the [RC] input is turned off.
• When the [SC] input is turned on, the aux.pouer output is validated.
The upper limit time is restricted by the built-in aux.power output timer.
( Note ) Restriction of Aux.power output
• Set the aux.power output timer (valiable : 0 ~ 30sec) to
the value shown in the right or less. (Any value out of
this range will not be accepted.)
• Make it a rule to secure the [SC] input ON/OFF interval,
to 3 minutes or more, which is used to validate the
aux,power output.
• The output current of power amplifire is determined by
the rated current of clutch / brake used in condition.
Note that the graph shown at right is not the output cur-
rent as aux,power amplifire.
→Input signal
→Output
Imax
Vmax
0
0
→Input signal
→Output
24V
Vmax
0
0
ON
OFF
[ST] input
Stop gain
Stop bias SPT
SPT
SPT：Stop timer
SSTSST
[SC] Input
ON
OFF
SST：Aux. power output timer
Aux. power output OFF
ON
0
10
20
30
01234
→Power amplifier output current(A)
→Limit timer (s)

8
2.2 Eqivalent block diagram
--------Refre to page 12, 13, 16, 17 for setting.
(1) Input signal level ( initial value : 5V )
When the power source is turned on with the DIP SW1 and SW3 turned on and the DIP SW2
turned off, the input voltage free mode is set, by which the input signal voltage level ( Vmax = 0.5
~ 8V ) is validated by the key operation.
(2) Non-linearity compensation ( initial setting : Lineare line )
If the transmission torque (%) of clutch / brake at excitation current of 20%, 40%, 80% has been
set, the non-linearity compensation is executed by 5-stage polygonal line approximation method.
(3) Inversion of remote input [RC] logic
Under the initial condition, the power amplifire output is validated when the input is turned on.
(4) Stop gain ( initial value : 100%)
(5) Stop bias ( initial value : 0%)
(6) Stop timer ( initial value : 10 sec)
(7) Aux.power output limit time ( initial value : 10 sec)
• The unit can be generally used as a power amplifire at the initial value (value at time of factory shippment ).
It is recommended to set the non-linearity compensation in accordance with the procedure shown in page
13.
• It is desirable to execute the setting of above items (4) ~ (7) at the tension control unit side. It will be con-
venient to set the power anplifire side timer, to as longer time as possible.
Powder clutch / brake
Hyisteresis cluthc / brake
50 / 60Hz
Power source Power
source
250V 8A
PP
PN
SET
SP
SN
2.2KΩ
0.1Ω
N
L
A1
A2
A4
SG
S1
S2
Change of
input signal level
Voltage
contorl mode
Current contorl
mode
Non-linear
compensation
SST
12V
Aux power
source timer
12V
SC
RC
RS
ST
PL
SN
12V
12V
8V
+10%
-15%
AC100 ~ 240V
Class D grounding
( 100Ωor less )
Grounding resistance
100Ωor less
Aux.Power
source
Remote
Start
External
variable resistor
built-in variable
resistor
Change of
output level
A3
SPT
SPG
SPB
Powder clutch / brake
Hyisteresis cluthc / brake
DC24V 4A
DC10V 2A
Un-used
Un-used
Be short-curcuited between ST and SN terminal. when the stop gain or the stop bias is not used.
1. Setting items by key operation

9
3.1 Outside dimension
• Outer painting color : Munsell 7.5Y7.5 / 1 • Weight : Approx.2.5kg
L N ・ SN SG RS SN RC SN ・PN PP
・SET SP SN ST SC PL 12V ・S2 S1
POWER
CV
CC
RC
POWER AMPLIFIER ＬＥ－５０ＰＡＵ
PULL
MODE INC S DEC T SET
POWER AMPLIFIER MODEL
LE-50PAU
INPUT AC85～264V OUTPUT DC24V4A/MAX SERIAL
170
180
125 140
100
11
9
44
Mounting hole (4-φ4.5) M3.5 terminal screw
ＬN
•
SN SG RS SN RC SN
•
PN PP
•
SET SP SN ST SC PL 12V
•
S2 S1
3. Specifications

10
3.2 Input / output specifications
3.3 Environmental specifications
3.4 Set item list
Item Terminal
name Specifications
Power
supply
Input
L• 100 to 240 VAC (-15% to +10%) , 50/60 Hz • Power fuse : 250 V, 8 A ×2, built in
• Power consumption: 400 VA (at 24 VDC, 4A) • Rush current : 50A, 300ms
• Allowable instantaneous power interruption: 10 ms
N
Output
SET • Service power supply for the external variable resistor
• 8VDC. External variable resistor : 2kΩ
SN
Input
signal
PP • Power amplifire output
• 0 to 24 VDC, 4 A or less • Load resistance :4.8Ω/ 75ºC or over
PN
S1 [1] Aux.power output : 10VDC 2A
Load resistance :4.8Ω/ 75ºC or over
[2] RUN (normal operation) output
DC12V 100mA
Set output
mode by set-
ting operation
S2
Output
signal
SP • Control signal Internal resisitance : 22kW
Signal level is set using DIP switch and key.
ST
• Start signal
When input is turned off, stop gain, stop bias and stop timer are
valid.
Input current
DC12V 5mA
RC
• Output remote signal
ON : power amplifier output ON
OFF : power amplifier output OFF
ON/OFF mode
: Logic invrsion ready
SC
• Aux.power output ON/OFF signal
ON : Aux.power output ON
OFF : Aux.power output OFF
SN • Input signal common terminal
Ambient temperature • 0 to 55ºC- - - - during operation
Ambient humidity • 35 to 85% RH (no condensation)during operation
Vibration resistance • 10 to 55Hz 0.5mm (19.6m/s2max) 2 hours in each axis direction.
Impact resistance • 98m/s23 times in each axis direction.
Noise resistance • By noise simulator with 1,000Vp-p noise voltage, 1µs noise width and 30 to 100Hz.
withstand voltage • 1,500V AC, 1 minute Between power terminal and earth treminal
Insulation resistance • 5MΩor more by 500V DC megger
Grounding • Class D grounding. ( 100Ωor less. Grounding shall not be performed together with
any high power system.)
Operationatmosphere • Free from corrosive or flammable gas and conductive dust, less dust.
Symbol Unit Range of setting Initial value
Minimum Maximum
Input signal voltage revel Vmax V 0.5 ~ 8V 5.0
Stop timer SPT s 0 30 10
Stop gain SPG % 0 300 100
Stop bias SPB % 0 60 0
Aux.power output timer SST s 0 30 10
Non-linearity compensasion T10,T20,
T40,T80 % 1.0 99.0 10, 20,
40, 80

11
4.1 Installation dimension / wiring work
• Install and fix the LE-50PAU power amplifier at the inside of panel, using
the fixing holes ( φ4.5 ) prepared at four corners.
• The LE-50PAU power amplifier is provided with a groove at the bottom
surface to avoid the DIN rail, however, it is unable to fit the LE-50PAU
power amplifire to the DIN rail.
--------- The genaral external connection is shown on page 8.
• Use the crimp-style terminals. Dimensions shown in the right figure.
• Tighten the terminal securely at a torque of 0.5 to 0.8 N•m, so that any mal-
function should not be generated.
• Do not connect the wire to the empty terminal [ • ] at the outside.
• Use a shield wire for analog input wire.
• Do not attempt to execute the input / output wiring in the same duct as that
used for other power wire, or to bind such wire together with the other pow-
er wiere.
• A connection example for analog input is as shown on page 15.
• There is not any problen even if the input wiring is extended up to approx. several dozens of meters in
accordance with the precautions (shown at avobe ), however, it is generally advised to execute the wir-
ing up to within 20m, taking safety against noise into consideration.
• Use a small signal switch for contact input, which is suitable to a small current of 12VDC 5mA,
1. Installation dimension
170±0.2
125±0.2
4-M4 screw
• Do not install the LE-50PAU power amplifire on the floor surface, for prevention of temperature rize, but
be sure to install it directly to the sheet metal part on the wall surface.
• Secure a space of over 100mm between each unit of between the eqipment and other eqipment or
structure. Keep the eqipment isolated from the high-voltage wire, high- voltage unit or power unit.
CAUTION
2. wiring work
M3.5
6.8 or less
6.8 or less
• To execute the installation/ wiring work, be sure to shut off all phases of power source externally in
advance.
• Do not install the LE-50PAU power amplifire at a place of dust, oil mist, conductive dust, corrosive gas or
iflammable gas.
• Do not install the LE-50PAU power amplifire directly at a place where vibration or shock is applied.
• Do not install the LE-50PAU power amplifire at a place which may be exposed to high-temperature,
dewing or rain/ wind.
• To execute the drilling or wiring, be careful not to allow the cutting chip or wire chip to drop.
• Since the case is made of aluminum die cast, the surface may reach high temperature during operation.
Since this may cause the operator to get burned, use such installation method that will not allow the body
to make direct contact with the surface of case.
CAUTION
4. Installation / wiring

12
4.2 Connection of power circuit
• Apply 85 to 264VDC 50 / 60Hz to the terminal [L] - [N].
The power consumption of the LE-50PAU power amplifier is 400VA.
When a fuse is arranged externally, however, it is advised to secure the fuse capacity of 10A or over,
taking rush current into cinsideration. (The maximum rush current is 50A.)
1. Examle of connectiton
N
L
SG
N
L
SG
N
L
SG
SG
LE-30CTN
LE-40MTA
LE-40MTB
LD-FX
DIP SW.1=ON
Class D grounding
( 100Ωor less )
Power source
LE-50PAU
• Arrange the emergency stop circuit of the LE-50PAU power amplifire at the outside independent of
tension controller.
If the tension controller is used in a wrong manner of operated erroneously, the LE-50PAU power
amplifire may run away, or other serious accident may occur.
WARNING
• The LE-50PAU power amplifire is an electronic equipment in which a micro computer(CPU) is
incorporated.
If a conductive foreign matter is mixed in the equipment or any unusual niise is applied from the external
unit, causing the CPU to run away, the watch-dog timer is operated.
• Execute the solid grounding(grounding resistance: 100Ωor less ) to the earth terminal, using a wire of
over 2mm
2
.
In this case, however, be careful not to use the earth commonly to the high power system.
• Connect the earth terminal of tension controller to that of the LE-50PAU power amplifire to each other,
and execute the earth at the tension controller side.
• Ececute the earth for the earth terminals( for shield wire ) such as [SG], [FG], [SG1], [SG2], etc. at the
same time.
• The power source of the LE-50PAU power amplifire is prepared commonly for100VAC and 200VAC.
Connect the power source to across the terminal[L] –[N].
Note that connecting the power wire to the input/ output terminal or DC power terminal may cause the
equipment to be broken.
• Turn ON / OFF the power source of the LE-50PAU power amplifire together with that of tension
controller.
Use a power wire of over 2mm
2
to avoid any voltage drop.
CAUTION

13
4.3 Connection of input circuit
------ For 1 to 5V input and 4 to 20mA input, refer to page 48.
(1) External variable resistor
• To input the signal, using the external variable resistor, connect it as shown below in the following
drawing, turn on the DIP switch SW2 and turn off the SW3 ( input : 0 to 8V ).
• Use a variable resistor of 2kΩ( linear characteristic ).
(2) LE-30CTN, LE-40MTA, LE-40MTB, LD-FX
• Connect the LE-50PAU power amplifire to the LE-30CTN, LE-40MTA, LE-40MTB or LD-FX ten-
sion controller as shown below in the following drawing, turn on the DIP switch SW2 and SW3,
and set the input to 0 to 5V.
• Use a switch for small signal suitable to small current (12VDC 5mA ).
• When the power amplifire output is not turned ON / OFF remotely, keep across [RC] - [SN] short-cir-
cuited.
• When the stop gain, bias or aux.power amplifire is not used, keep the [ST] terminal short-circuited and
the [SC] terminal opened.
1. Analog input
SP
SET
SG
LE-50PAU
SN
DC 8V
2kΩ
External
variable resistor
0～8V
Grounding resistance
100Ωor less
DIP SW.1=ON
SP
SET
SG
LE-50PAU
SN
DC 8V
LE-30CTN
LE-40MTA
LE-40MTB
LD-FX
0～5V
(Unused)
DIP SW.1=ON
Class D grounding
( 100Ωor less )
Control signal for
servo amplifier
power amplifier
2. Digital input
RC
ST
SN
LE-50PAU
SC
12V
Start (start/stop)*
Power amplifire output ON
Aux.power output ON
2.2kΩ
DIP SW.1=ON

14
4.4 Connection of output circuit
The one-reel controller or feeld roll controller does not use any aux.power amplifire.
Set the DIP switch SW4 to SW10 in accordance with the rated current of clutch / brake connected to the
LE-50PAU power amplifire output [PP] - [PN]. ( See page 5. )
• The reel change circuit is as shown above.
Prepare a switch which is turned on wihle the old reel is stopped, and connect it to across the terminals
[SC] and [SN].
• Do not short circut across the terminals [PN] and [S2], for current control of power amplifire and for
detection of over-current.
For this reason, use a bipolar ( negative / positive ) switching curcuit.
• Be sure to connect a sires resistor ( RA, RB ) to the commutation diode ( DA, DB ) used for protection
of changeover swich, by which the normal commutation current flows in the diode built in the power
amplifire, which allows the current to be detected correctly.
Type LE-30CTN, LE-40MTA, LE-40MTB tension controller
PP
12V
PA
DA、RA
PB
DB、RB
DA、DB：200V 5A
RA、RB：10W 47Ω
PN
S1
S2
SP
SN
SG
SC
SN
LE-30CTN
LE-40MTA
LE-40MTB
0～5V
Old reel stop
Reel change
LE-50PAU
Class D grounding
( 100Ωor less )
Control signal for
servo amplifier
power amplifier

15
5.1 Setting procedure / Input signal level
• Turn on the DIP SW1 to set the power amplifire mode.
• Turn on the DIP SW4 to SW10 to set the output to full-scale (
0.2 to 0.4A ) or 24VDC.
• When the DIP SW2 and SW3 are turned on, the output is de-
fined to be set to 0 to 5V.
• When the DIP SW2 is turned on and SW3 is turned off, the out-
put is defined to be set to 0 to 8V.
• When the DIP SW2 is turned off and SW3 is turned on, it is pos-
sible to adjust the input signal level to 0 to Vmax (Vmax = 0.5 to
8V ). The adjustment procedure in this case is described as be-
low.
• Set the non-linear characteristic in accordance with the proce-
dure shown on the next page. It is teated as a linear character-
istic unless the setting is made.
• Set the [RC] input logic, stop gain, stop bias, stop timer and
aux.power output timer as reqierd in accordance with the pro-
cedure given on page 25, 26.
The adjustment is executable at any time, and it is validated when the DIP SW1 is turned on, SW2 is
turned off, SW3 is turned on and the power source is closed.
• When the power source of LE-50PAU is closed, the output cur-
rent or output voltage is displayed soon in accordance with the
sequence shown on page 23.
• When the [MODE] key is pressed with the [INCS] key pressed,
the input signal level adjustment mode is turned on.
• [ L ] indicate that the input signal level adjustment mode is
turned on, in which the current adjustment value is indicated.
• Press the [INCS] key or [DECT] key several times to display
the target tnput signal level ( 0.5 to 8.0V ).
When the key is kept pressed, the numeric value is incremented
or decremented at high speed automatically.
• The drawing given at left shows a screen of numeric value dis-
played by operation of [INCS] key or [DECT] key, in which the
value is set to 4.3V for instance.
• When the [SET] key is pressed, the numeric value set in this
case is updated and stored in the EEPROM memory within the
LE-50PAU power amplifire.
When the [INCS]] key is pressed with the [MODE] key pressed, the
input signal adjustment mode is reset.
• If only the [MODE] key is pressed before the operation, it is pos-
sible to correct the input signal level again.
1. Setting procedure
Setting of DIP switch
( See page 5.)
Adjustment of input signal level
Adjusutment of non-linear
characteristic
Special setting
Power OFF
Power ON
2. Input signal level
Output
display
MODE
S
INC
S
INC
T
DEC
SET
MODE
MODE
S
INC
Power
ON
5. Initial setting

16
5.2 Non-linear compensation
• The exitation current vs. transmission torque character-
istic of clutch / brake is of non-linear characteristic as
shown at right, and may be different, depending on the
type name of each clutch / brake.
Set the transmission torque value at 10%, 20%, 40%
and 80% current for non-lineare data.
• In this case, “100%” current is a rated current of clutch /
brake, and “100%” torque is a transmission torque at
the rated current, and is greater than the value of nom-
inal torque of clutch / brake for new product.
• The following shows a setting example based on the ex-
ample shown in the drawing at right.
The practical clutch / brake setting value is as shown in
the list given no the page 21,22.
• When the [INCS] key or [DECT] key is pressed, the numeric value displayed is increased or de-
creased.
• When the key is kept pressed, the numeric value is incerment or decrement at high speed automatically.
• When it is not necessary to change the numeric value, press the [SET] key as it is, by which the step
is advanced to the succeeding step. The last step is resumed each time when the [MODE] key is
pressed.
1. Non-linear characteristic
100
72
(47)
25
8.9
3.1
10 20 40 (60) 80 100
→Excitation current (%)
→Transmission torque (%)
100%=Torque ata rated current
100%= Rated current
2. Setting procedue
Output display
MODESET MODE SET
When the MODE key is pressed with the SET key
pressed, the non-linear data setting mode is turned on.
When the same operation is performed again, the mode
is reset and the output display mode is serumed.
S
INC
T
DEC
S
INC
T
DEC
S
INC
T
DEC
S
INC
T
DEC
SET MODE
SET MODE
SET MODE
SET MODE
10% current 10% torque 10% current 3.1% torque
Dsiplay of memory value
20% current 20% torque 20% current 8.9% torque *
* : When the value exceeds 19.9, the decimal point disappears and the
2-digit interger is displayed automatidally .
80% current 80% torque 80% current 72% torque
40% current 40% torque 40% current 25% torque
Correction
Display of memory value
Correction
Correction
Correction
Display of memory value
Display of memory value