Varedan Technologies LA-1500 Series Product manual

LA Series Linear Servo Amplifier
LA-800 Series
LA-1500 Series
Technical Reference Manual
Manual Revision: D
3870 Del Amo Blvd. Suite 503, Torrance CA, 90503
www.varedan.com
代理商：北京慧摩森 电子系统技术有限公司
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LA Series Linear Servo Amplifier Technical Reference Manual
2
Original Manual Revision December 5, 2011
Copyright 2011 Varedan Technologies
Corporate Office:
Varedan Technologies
3870 Del Amo Blvd., Suite 503
Torrance, CA 90503
Phone: [phone]
Fax: [phone]
Eastern Region Sales & Support
Phone: [phone]
www.varedan.com
This document contains proprietary and confidential information of Varedan Technologies, LLC
and is protected under Federal copyright law.
The information in this document is subject to change without notice. No part of this document
may be reproduced or transmitted in any form without the express written consent of Varedan
Technologies, LLC.
Document Change History
Revision Description
A Original for new board design from LA manual rev G.
B Add part numbers for LA1500 and VMC-3000
C Transconductance table for different models, Revise mechanical dimensions
D Correct ABSI time in jumper description.

LA Series Linear Servo Amplifier Technical Reference Manual
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 Warning! Potentially lethal voltages exist within the amplifier when power is
applied. Never attempt to handle or probe the amplifier with power applied.
 This product contains static sensitive devices and requires proper handling with
ESD protection.
 These amplifiers are capable of producing large amounts of energy. Serious
injury or death can result from improper motor or load movement. The amplifier
requires an external controller for Sinusoidal mode operation to commutate the
motor properly. In Trapezoidal mode operation, the amplifier requires properly
phased Hall sensors for commutation. Verify proper Hall sensor phasing and
motor direction before connecting any load to a motor.
 Do not connect the motor to the system load during initial testing and installation.
 These amplifiers require customer supplied airflow for proper operation.
Operation of the amplifier without proper cooling will void the warranty. Contact
the factory for information on adequate airflow for your application.
 Be sure power is off when inserting or removing connectors or connections.
 For motors with a phase to phase inductance of less than 250uH, please consult
the factory. A special set of current loop bandwidth components will need to be
installed for safe operation of the amplifier.
CAUTION! READ THIS SECTION BEFORE PROCEEDING.
!

LA Series Linear Servo Amplifier Technical Reference Manual
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Contents
1 INTRODUCTION ...................................................................................................................................7
1.1 SAFE OPERATING AREA ....................................................................................................................7
2 SPECIFICATIONS.................................................................................................................................8
3 MODEL NUMBERING ...........................................................................................................................9
4 PROTECTIVE FEATURES .................................................................................................................10
5 OPERATIONAL DESCRIPTION .........................................................................................................11
6 JUMPER SETTINGS...........................................................................................................................11
6.1 LA-800 SERIES JUMPER SETTINGS ..........................................................................................12
6.2 LA-1500 SERIES JUMPER SETTINGS ........................................................................................13
6.3 JUMPER DESCRIPTIONS ..............................................................................................................14
7 CONNECTOR CONFIGURATIONS....................................................................................................15
7.1 J1 SIGNAL CONNECTOR ..............................................................................................................15
7.2 J2 BIAS POWER CONNECTOR ....................................................................................................15
7.3 J3 MOTOR FEEDBACK CONNECTOR .......................................................................................15
7.4 J4 BUS POWER CONNECTOR ....................................................................................................16
7.5 J5 MOTOR CONNECTOR ..............................................................................................................16
7.6 J6 INTERFACE P-BOARD CONNECTOR ...................................................................................16
7.7 J7 INTERFACE P-BOARD CONNECTOR ...................................................................................16
7.8 J8 STATUS OUTPUT CONNECTOR ............................................................................................17
7.9 J9 MOTOR TEMPERATURE SWITCH CONNECTOR ..............................................................17
7.10 J10 SERIAL COMMUNICATION CONNECTOR ........................................................................17
7.11CONNECTOR PART NUMBERS ..................................................................................................18
8 USER INTERFACES ...........................................................................................................................19
8.1 PUSH BUTTON ................................................................................................................................19
8.2 LED DISPLAY ...................................................................................................................................19
8.3 SOFTWARE VERSION DISPLAY .................................................................................................19

LA Series Linear Servo Amplifier Technical Reference Manual
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8.4 L.E.D. ERROR CODES AND MEANING ......................................................................................20
8.5 STATUS INDICATOR/REMOTE DISPLAY PORT ......................................................................22
8.6 SERIAL PORT ...................................................................................................................................22
8.6.1 SERIAL COMMANDS..................................................................................................................23
8.6.2 SERIAL PARAMETER SETTINGS .............................................................................................25
8.6.2.1 SOFTWARE PARAMETER SETTING TABLE SUMMARY ........................................................26
9 BALANCING ........................................................................................................................................27
9.1 AUTOBALANCE ...............................................................................................................................27
9.2 MANUAL BALANCE .........................................................................................................................28
10 TEST POINTS .....................................................................................................................................29
APPENDIX A. SERIAL COMMUNICATION MESSAGES...........................................................................37
10.1 SIGN ON MESSAGE ......................................................................................................................38
10.2 ALARM MESSAGES .......................................................................................................................38
10.3 AUTOBALANCE MESSAGES .......................................................................................................38
10.4 ENABLE STATUS MESSAGES ....................................................................................................39
10.5 FACTORY DEFAULT MESSAGE .................................................................................................39
10.6 HELP MESSAGES ..........................................................................................................................39
10.7 LIST MESSAGES ............................................................................................................................40
10.8 MODE COMMAND MESSAGES ..................................................................................................40
10.9 SAVE PARAMETERS MESSAGE ................................................................................................40
10.10 FAULT HISTORY MESSAGES ..............................................................................................41
10.11 CLEAR FAULT HISTORY MESSAGE ..................................................................................41
10.12 SOA FAULT HISTORY MESSAGES ....................................................................................42

LA Series Linear Servo Amplifier Technical Reference Manual
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List of Figures
Figure 1. Jumper Locations...................................................................................................... 12
Figure 2. Jumper Locations...................................................................................................... 13
Figure 3 – Location of Jumpers, Balance Potentiometers and Test Points ............................... 30
Figure 4. Functional Block Diagram – All Models ..................................................................... 31
Figure 5. Installation Drawing Details ....................................................................................... 32
Figure 6. Typical Connections Single-Phase Models with “S” suffix.......................................... 33
Figure 7. Typical Connections Three-Phase Models with “T” suffix .......................................... 33
Figure 7. Typical Connections Three-Phase Models with “T” suffix .......................................... 34
Figure 8. LA-800 Series Mechanical Dimensions ..................................................................... 35
Figure 9. LA-1500 Series Mechanical Dimensions ................................................................... 36

LA Series Linear Servo Amplifier Technical Reference Manual
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1 Introduction
The LA series of Linear Amplifiers are the perfect choice for systems requiring low
radiated noise and zero distortion from the drive electronics. These high power current mode
linear amplifiers are well suited to drive low inductance/resistance loads such as brushless and
brush servo motors or voice coils. Commutation options include externally commutated 2-phase
sine input, trapezoidal commutation using motor mounted hall sensors, or single-phase control.
With their true class AB linear output stage, their design features pure analog control
from input to output. The on-board DSP only provides monitoring functions and does not get
involved in the current control of the output stage.
The LA amplifiers are both extremely quiet and provide the ultimate in zero cross-over
distortion for smooth output positioning. The design of these amplifiers includes an on board
high speed DSP which monitors all key system functions in real time and provides protection for
the outputs by only allowing output power within the “Safe Operating Area” of the output
transistors. An intelligent user interface allows setup and storage of all system parameters via
the serial interface. Non-volatile memory provides storage of the parameters during power off
conditions.
1.1 Safe Operating Area
The LA amplifiers include a sophisticated algorithm that protects the outputs from over
power conditions. This algorithm is matched to the power characteristics of the output
transistors in each amplifier model. With linear servo amplifiers (as opposed to PWM amplifiers),
it is very important to provide over-power protection (rather than simple over-current protection)
due to the linear nature of the output control. In the case of PWM amplifiers, only over-current
protection is required since the outputs are operating in saturation mode or “full on mode”. This
mode provides very little voltage drop across the output transistors, so simple current monitoring
is sufficient to provide protection of the outputs.
With linear servo amplifiers, the outputs are operating in their linear region, so the
voltage across the output transistors can be a substantial contribution to the total power
dissipated by the device. To properly protect the amplifier from damage, the amplifier must
provide protection by monitoring the power (voltage * current) in the output devices. To put this
in perspective, the outputs used in our LA-415 (5A continuous, 15A peak) can handle 60A under
the proper conditions! It’s the power that has to be kept under control.
The DSP in the LA series amplifiers monitors the power of each output device in real
time as the device is switched on by the control circuitry. This instantaneous power
measurement is compared with the transistor manufactures recommended “safe operating area”
curve (published in all transistor specifications) stored in the DSP memory. The amplifier is shut
down in the event the measured power exceeds the recommended ratings of the output
devices.
Our Safe Operating Area (SOA) algorithm has proven to be very effective in protecting
the amplifier from damage due to over power conditions. While the user may experience
“nuisance” tripping of the SOA protective function during system development and testing, be
aware that the conditions that caused the “nuisance” trip may have very well have destroyed an
amplifier without this SOA protection.

LA Series Linear Servo Amplifier Technical Reference Manual
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2 Specifications
2.1 LA-800 Series
LA-830 LA-835 LA-840
Peak Output Current 30A 35A 40A
Continuous Output Current 15A 18A 20A
Peak Output Power (25°C) 3000W 4500W 6000W
Continuous Power Dissipation (25°C) 800W 800W 800W
Size - Length x Width x Height 8.00 in. x 8.16 in. x 4.8
Motor Bus Voltage – Bipolar +/-12 to +/-150VDC
Bias Supply Voltage - Bipolar +/-14.5 to +/-16.0V (@300mA each)
Max. Heat Sink Temperature 70°C
Current Loop Bandwidth* up to 10kHz
Operating Modes 2-Phase Sine, Trapezoidal, Single-Phase
Absolute Overcurrent Trip Time 50ms
Hall Sensor Supply (+5 Ext.) +5V @ 100mA max.
Command Signal (A and B inputs) +/-10V Single-Ended, +/-20V Differential
2.2 LA-1500 Series
LA-1535 LA-1545 LA-1555
Peak Output Current 35A 45A 55A
Continuous Output Current 20A 25A 30A
Peak Output Power (25°C) 3000W 4500W 6000W
Continuous Power Dissipation (25°C) 1500W 1500W 1500W
Size - Length x Width 8.00 in. x 8.16 in. x 5.75
Motor Bus Voltage – Bipolar +/-12 to +/-150VDC
Bias Supply Voltage - Bipolar +/-14.5 to +/-16.0V (@300mA each)
Max. Heat Sink Temperature 70°C
Current Loop Bandwidth* up to 10kHz
Operating Modes 2-Phase Sine, Trapezoidal, Single-Phase
Absolute Overcurrent Trip Time 50ms
Hall Sensor Supply (+5 Ext.) +5V @ 100mA max.
Command Signal (A and B inputs) +/-10V Single-Ended, +/-20V Differential
*This setting can be customized. Please contact the factory for details.

LA Series Linear Servo Amplifier Technical Reference Manual
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3 Model Numbering
3.1 Amplifier Module
The LA Series Linear Amplifier modules are available in various power options and in either
single-phase or 3-phase models.
800 Series
Model Number Breakdown: LA-830-T
Linear Amplifier
Power Level (see table)
S=Single Phase, T= 3 phase
1500 Series
Model Number Breakdown: LA-1530-T
Linear Amplifier
Power Level (see table)
S=Single Phase, T= 3 phase
3.2 Motion Controller Module
The LA series is designed to accept our VMC-3000 plug-in motion controller module that
transforms the amplifier into a complete single-axis motion controller. For brushless 3-phase
motors, this module provides commutation from a motor-mounted encoder and can perform
position, velocity or torque mode control. For brush motors, this module provides position and
velocity modes using a motor-mounted encoder for position information. Please refer to the
VMC-3000 Technical Reference Manual for more information.
The VMC-3000 option adds a “1” to the part number as shown below:
800 Series Motion Controller
Model Number Breakdown: LA-8130-T
Linear Amplifier
VMC-3000 motion controller
Power Level (see table)
S=Single Phase, T= 3 phase
1500 Series Motion Controller
Model Number Breakdown: LA-15130-T
Linear Amplifier
VMC-3000 motion controller
Power Level (see table)
S=Single Phase, T= 3 phase

LA Series Linear Servo Amplifier Technical Reference Manual
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4 Protective Features
DSP Fault – Set when the internal DSP checksum fails following reset
NVM Fault – Set when NVM checksum fails following reset. Parameter defaults set.
External +5V – Set when on board +5V supply for Halls is out of range
Autobalance Fault – Set when autobalance can’t balance amplifier outputs
ABS Overcurrent – Set when instantaneous overcurrent condition is detected
SOA – Set when Safe Operating Area protection detects an over power condition
5 VDC Reference error – Set when internal +5 reference supply is out of range
Bus Over Voltage – Set when Bus voltage is greater than maximum allowed (75 Vdc)
Hall Error – Set when hall sequence is invalid (0 or 7 value is read on hall inputs)
Fatal Error – Set if the DSP encounters an unidentified problem.
Amplifier Over Temp – Set when amplifier heat sink temperature exceeds 70 C.
Motor Over Temp – Set when motor temperature input is open
Overcurrent – Set when amplifier detects an overcurrent condition
Bus Under Voltage – Set when Bus voltage is less than the minimum allowed (10 Vdc)
Bias error – Set when Bias voltage input +/-15 is outside allowable range
2.5V Reference error – Set when internal 2.5V supply is out of range.

LA Series Linear Servo Amplifier Technical Reference Manual
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5 Operational Description
Before applying power to the amplifier be sure to read all sections in this document.
Upon power up of the +/- 15V bias supply, the amplifier derives all the necessary internal
voltages for operation related to the logic and output drivers. Once the proper levels are
achieved, the DSP is released from reset and begins operation. A series of internal checks are
done to insure the DSP is operating correctly. The I/O is initialized for operation if these checks
pass. The NVM is then read and the stored checksum is verified. If the system is setup to use
jumpers, the jumpers are read; otherwise the parameter information from NVM is used. The
analog balance network is set to the stored balance values. The version and revision number
for the software is flashed on the display and the serial sign on message is sent.
The state of the Enable input is read to determine whether the hardware enable input or
the software serial enable command should be used to enable the drive. If the hardware Enable
input is open (high) the system allows software to control the Enable operation via the E
command. If at anytime during operation the Enable input goes low, the software mode is
cancelled and the hardware Enable input is used for control. The initialization process is now
complete and the software enters main loop processing.
During main loop processing, the software runs in an endless loop performing the tasks
necessary for drive operation. Once per pass in the main loop, the 7-segment LED and status
port are updated, the inputs are scanned and the protective algorithm calculations are
performed. In addition to the main loop processing, interrupts are enabled to handle such
actions as Limit input processing for Hall mode, A/D processing for all system voltages and
currents, and serial communication if used.
If at anytime during operation a fault occurs, the drive will immediately disable the motor
windings, set the Fault output active and display the fault code on the LED display. A message
will also be sent over the serial interface annunciating the fault. The “A” command can also be
used to obtain fault information.
Note that bias power (+/-15V) is always required for the drive to operate. Bus power is
only required if a motor is to be used. This allows the drive to be set up away from the actual
system using only the bias supply.
6 Jumper Settings
The next few pages define the jumper settings for each model amplifier. The settings for the
over current trip levels are different for each model, depending on the number of outputs and
the heatsink configuration. All other settings are identical for each model.
Jumper settings are only updated following a reset or POR of the drive.
If no jumpers are installed on JP1, JP2 and JP3, the parameters will be set via software.
Note 1: If using jumpers in Sine Mode with minimum settings (no jumpers), install a jumper on
JP1-G to force the drive to use the jumper settings. This prevents the drive from using software
settings as described in Note 2.
Note 2: JP1H and JP2-A are not used in single-phase mode models.

LA Series Linear Servo Amplifier Technical Reference Manual
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6.1 LA-800 Series Jumper Settings
JP1 JP2
A B C D E F G H A B C D E F
JP3
Figure 1. Jumper Locations
JP1
Continuous Overcurrent
Trip Level Amps (model specific)
LA-830 LA-835 LA-840 JP1-A JP1-B
5 5 5 Open Open
8 10 10 In Open
12 15 15 Open In
15 18 20 In In
Overcurrent Trip Time
Trip Time JP1-C JP1-D
1.25 Sec Open Open
2.5 Sec In Open
5 Sec Open In
10 Sec In In
Absolute Overcurrent
Trip Level Amps (model specific)
LA-830 LA-835 LA-840 JP1-E JP1-F
10 20 25 Open Open
15 25 30 In Open
25 30 35 Open In
30 35 40 In In
JP1-G, Normally Not Used. See Note 1
Motor Reverse Selection (Hall Mode)
Mode JP1-H
Normal Open
Reverse In
JP2
Sine/Hall Mode Selection*
Mode JP2-A
Sine Mode Open
Hall Mode In
*See Notes 1&2
Input Filter Setting
Filter JP2-B JP2-C
500 Hz Open Open
800 Hz In Open
15 kHz Open In
32 kHz In In
Transconductance Ratio Setting (Amps/Volt)
LA-830 LA-835 LA-840 JP2-D JP2-E
2.0 2.0 2.0 Open Open
3.0 3.0 3.0 In Open
4.0 4.0 4.0 Open In
5.0 5.0 5.0 In In
Input DAC Selection
DAC Input JP2-F
Differential (Bipolar) Open
Single Ended (Unipolar) In
JP3
Current Loop Bandwidth Setting
Bandwidth JP3-A JP3-B
Contact Open Open
Factory In Open
For Open In
Settings In In
A B

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6.2 LA-1500 Series Jumper Settings
JP1 JP2
A B C D E F G H A B C D E F
JP3
Figure 2. Jumper Locations
JP1
Continuous Overcurrent
Trip Level Amps (model specific)
LA-1535 LA-1545 LA-1555 JP1-A JP1-B
5 10 15 Open Open
10 15 25 In Open
15 20 25 Open In
20 25 30 In In
Overcurrent Trip Time
Trip Time JP1-C JP1-D
1.25 Sec Open Open
2.5 Sec In Open
5 Sec Open In
10 Sec In In
Absolute Overcurrent
Trip Level Amps (model specific)
LA-1535 LA-1545 LA-1555 JP1-D JP1-E
10 15 25 Open Open
15 25 35 In Open
25 35 45 Open In
35 45 55 In In
JP1-G, Normally Not Used. See Note 1
Motor Reverse Selection (Hall Mode)
Mode JP1-H
Normal Open
Reverse In
JP2
Sine/Hall Mode Selection*
Mode JP2-A
Sine Mode Open
Hall Mode In
*See Notes 1&2
Input Filter Setting
Filter JP2-B JP2-C
500 Hz Open Open
800 Hz In Open
15 kHz Open In
32 kHz In In
Transconductance Ratio Setting (Amps/Volt)
LA-1535 LA-1545 LA-1555 JP2-D JP2-E
2.0 2.0 2.0 Open Open
3.0 3.0 3.0 In Open
4.0 4.0 4.0 Open In
5.0 5.0 5.0 In In
Input DAC Selection
DAC Input JP2-F
Differential (Bipolar) Open
Single Ended (Unipolar) In
JP3
Current Loop Bandwidth Setting
Bandwidth JP3-A JP3-B
Contact Open Open
Factory In Open
For Open In
Settings In In
A B

LA Series Linear Servo Amplifier Technical Reference Manual
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6.3 Jumper Descriptions
JP1-A, B – Continuous Overcurrent Level – This setting determines the continuous level of current allowed
by the amplifier. Any phase current value above this setting causes an internal timer to run. If the timer
reaches the set value for Overcurrent Trip Time, the drive disables and the “L” error is displayed. The
decimal point on the LED display is lit when any phase current is above the Overcurrent setting. The
Overcurrent Timer accumulates time for any value of phase current that exceeds the Overcurrent threshold
value. The Overcurrent Timer is decremented for any phase current value less than the Overcurrent
threshold value. The decay rate of the timer is 2x the attack rate. This means that if the timer has
accumulated for 2 seconds, it takes 1 second for the timer to return back to 0.
JP1-C, D – Continuous Overcurrent Trip Time – This setting establishes the time that any phase current is
allowed to be above the Overcurrent setting. When the Overcurrent time is exceeded, the drive disables
and the Overcurrent error is reported (“L” on the display). The timer decays at a rate of 2x the attack rate.
JP1-E, F – Absolute Overcurrent – This setting establishes the maximum allowable current. If the current
exceeds the set value, the drive disables and the error is reported (“5”on the display). The amplifier is
designed to trip within 50mS of detecting the event.
JP1- G – Not used. Install this jumper if the desired amplifier setup requires no other jumpers. This will
prevent the software from using the stored NVM settings.
JP1-H – Motor Reverse – When this jumper is installed, the motor rotation in Hall mode is reversed for a
given input signal.
JP2- A – This jumper establishes the mode of operation for commutation, either Sine or Hall. In Sine
mode, the user must provide 2 analog input signals 120°out of phase, representing motor currents for
Phase A and Phase B. The amplifier internally derives the current for Phase C based on these inputs. In
Hall mode, the user provides a current reference command on Phase A input only. External Hall sensors
must be connected for motor commutation. The amplifier drives current to two of the three phases
depending on the Hall sequence input on the J3 Motor Feedback connector.
JP2- B, C – These jumpers establish the Input Filter setting. The cutoff frequency for low pass filtering of
the analog input command signals is set according to the values shown above.
JP2-D, E – Transconductance Ratio – These jumpers determine the amount of output current, in amps, for
a given input voltage, in volts, on the reference input(s) Command A and Command B. (Volts to amps
ratio).
JP2 – F – Input DAC Selection – This setting establishes the voltage configuration for the Command A and
Command B input signal reference. In Single Ended mode, the Command+ inputs accept a +/-10vdc input
with respect to ground (common). In Differential mode, the Command +/-inputs accept a +/-20vdc signal
terminal-to-terminal, non-grounded.
JP3 – A,B - Current Loop Bandwidth – This setting establishes the current loop bandwidth setting. Use
caution when changing from one setting to the next. The user does not normally set these jumpers. Please
contact the factory for details before changing these settings.

LA Series Linear Servo Amplifier Technical Reference Manual
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7 Connector Configurations
7.1 J1 Signal Connector
Pin Function
1 DAC Phase A+ Input Used in both Single Ended and Differential modes .
2 DAC Phase A- Input Used only in Differential mode .
3 DAC Phase B+ Input Used in both Single Ended and Differential modes. Not used in Hall Mode.
4 DAC Phase B- Input Used only in Differential mode. Not used in Hall Mode.
5 I Out – Output voltage representing 1V=6.6A Output Current. See note in Test Points section.
6 Common (Ground)
7 Limit+ - Active high input, Internally pulled high (3.3V), set low to enable travel. Not used in Sine Mode.
8 Common (Ground)
9 Limit – - Active high input, Internally pulled high (3.3V), set low to enable travel. Not used in Sine Mode.
10 Common (Ground)
11 Enable – Ground to enable amplifier. Internally pulled high (3.3V). See Operation Description.
12 Common (Ground)
13 Fault – High output indicates fault, low normally (no fault). Internally pulled high (5V)
14 Common (Ground)
15 Reset – Ground input to reset drive. Internally pulled high (3.3V)
16 Common (Ground)
Note: Inputs with 3.3V pull ups are 5V input compatible
7.2 J2 Bias Power Connector
Pin Function
1 +15 Volts DC in
2 Common (Ground)
3 Common (Ground)
4 –15 Volts DC in
7.3 J3 Motor Feedback Connector
Pin Function
1 No Connect
2 No Connect
3 Common (Ground)
4 Hall C Input
5 Hall A Input
6 Hall B Input
7 +5 Volts DC Output (100mA max)
8 No Connect
9 Common (Ground)
10 No Connect

LA Series Linear Servo Amplifier Technical Reference Manual
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7.4 J4 Bus Power Connector
Pin Function
1 +Bus Power
2 Bus Common (Ground)
3 –Bus Power
7.5 J5 Motor Connector
Pin Function
1 Phase A Output
2 Phase B Output. Note: For Single-phase operation, use Phases B and C.
3 Phase C Output
4 Motor Ground (for cable shield and/or FG connection if used)
(J5 pin 4 is internally connected to amplifier common or ground)
7.6 J6 Interface P-Board Connector
Pin Function
1 N/C
2 N/C
3 Common (Ground)
4 Common (Ground)
5 N/C
6 Command A
7 Command B
8 N/C
9 +3.3Vdc
10 Command Select 2
11 Command Select 1
12 Common (Ground)
7.7 J7 Interface P-Board Connector
Pin Function
1 N/C
2 N/C
3 N/C
4 N/C
5 N/C
6 N/C
7 N/C
8 +5Vdc
9 Common (Ground)
10 –15Vdc
11 Common (Ground)
12 +15Vdc
1
1

LA Series Linear Servo Amplifier Technical Reference Manual
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7.8 J8 Status Output Connector
Pin Function
1 7 Segment display – A
2 7 Segment display – B
3 7 Segment display – C
4 7 Segment display – D
5 7 Segment display – E
6 7 Segment display – F
7 7 Segment display – G
8 7 Segment display – DP
9 +5 Volts DC
10 Common (Ground)
7.9 J9 Motor Temperature Switch Connector
Pin Function
1 Motor Temperature switch +. Normally Closed to enable amplifier.
Internally pulled up to 5vdc. Jumper J9 pins 1-2 if input is not used.
2 Motor Temperature switch common. (Internally connected to Common)
7.10 J10 Serial Communication Connector
Pin Function
1 Receive (RxD)
2 Transmit (TxD)
3 Common (Ground)
4 Do Not Connect

LA Series Linear Servo Amplifier Technical Reference Manual
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7.11 Connector Part Numbers
Connector Manufacturer P/N Mate P/N Digi-Key #
J1 3M 3408-1302 3452-7600 MSD16K-ND
J2 Phoenix 17-59-03-3 17-57-035 277-1013-ND
J3 3M 3793-1302 3473-7600 MSD10K-ND
J4 Thomas & Betts 4PCR-03-008 N/A
J5 Thomas & Betts 4PCR-04-008 N/A
J6 Molex 90147-1212 Contact Factory
J7 Molex 90147-1212 Contact Factory
J8 3M 30310-6002HB 3473-7600 MSD10K-ND
J9 Molex 22-05-3021 *22-01-3027 WM2000-ND
J10 Molex 22-05-3041 22-01-3047 WM2002-ND
*Note: J9 can be shorted with a standard 0.100” jumper if motor temp switch not used.

LA Series Linear Servo Amplifier Technical Reference Manual
19
8 User Interfaces
8.1 Push Button
The push button is used for both the Reset and Autobalance functions. The DSP measures the amount
of time the button is active (pressed). If the button is active for less than 1 second, the drive is reset upon
release of the button. If the button is active for more than 1 second, the drive enters Autobalance mode.
The switch is debounced to prevent multiple entries into the Autobalance routines if the switch is held
down for longer than 1 second.
Pushbutton
> 1 Second = Autobalance
< 1 Second = Drive Reset
The push button can also be used during a power-on-reset to display the full part number of the software.
To use this feature, hold the push button in while applying bias power. The display will begin flashing the
full part number. Release the button before the part number display completes. See the section on
Software Version Display below.
8.2 LED Display
The LED Display indicates the status of the drive. Following a reset or POR, the LED will flash all
segments as a check to make sure they are working. The software version and revision are shown next.
The display will blank briefly (1/2 sec.) and the drive status or a system fault will be indicated. The drive is
fully functioning when the status is shown (“C” or “0”). When a fault is shown, the drive is disabled and
cannot be enabled until the fault is cleared. For most faults, a reset or AR 1 command is needed to reset
the fault. A Bus Undervoltage (U) fault will be automatically cleared when the bus is at the proper operating
voltage. A Fatal Error (F) can only be cleared by a power on reset of the amplifier.
8.3 Software Version Display
The software version is shown only following a power-on-reset (not after a pushbutton reset). The version
information is presented as follows:
Example: Display shows 2.1.0-4
“2” = Upper level part number designator
“1” = Major Software Version
“0” = Minor Software Version
“4” = Number of current loop bandwidth settings
The full part number of the software can be displayed during power-on-reset by holding in the push button
and applying bias power. The part number will be displayed in the following format:
Example: 4002-12.2.0-2
“4002”= Varedan Technologies product code
“12” = Upper level part number designator
(“10”=LA-400, “11”=LA-525,“12”=LA4-07,13”=LA-200 )
“2” = Major Software Version
“0” = Minor Software Version
“2” = Number of current loop bandwidth settings
.

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8.4 L.E.D. Error Codes and Meaning
The following table lists the L.E.D. error codes and their meaning. If multiple errors are present, the
display will cycle through all the error codes, displaying each for ½ second.
Amp ok, motor current enabled. This is the “normal” display when enabled.
DSP Fault – Set when the internal DSP checksum fails following reset
NVM Fault – Set when NVM checksum fails following reset. Parameter
defaults are set.
Hall Supply +5vdc – Set when on board +5v supply for Halls is out of range
Autobalance Fault – Set when autobalance can’t balance amplifier outputs.
ABS Overcurrent – Set when instantaneous overcurrent condition is detected
SOA – Set when Safe Operating Area protection detects an over power
condition.
5 VDC Reference error – Set when internal +5 reference supply is out of range
Bus Over Voltage – Set when Bus voltage is greater than +/-75 Vdc. `
(Note: Each leg (+ and -) is checked against this value.)
Amp ok, not enabled (Output is Clamped off). This is the normal display when
the amplifier is not enabled.
2.5 Vdc Reference error – Set when internal 2.5vdc supply is out of range.