Moons' SRAC2 User manual

SRAC2
AC Input Step Motor Drive
User Manual
Rev. 1.1
AMP & MOONS’ Automation

2
Rev. 1.2
10/6/2021
SRAC2 User Manual
Contents
1 Introduction.................................................................................. 3
1.1 Features.............................................................................................3
1.2 Block diagram ....................................................................................4
2 Mounting the Drive ...................................................................... 4
3 Connections ................................................................................ 5
3.1 Connecting to Power .........................................................................6
3.3 Connecting the Inputs and Outputs ...................................................8
3.3.1 Step & Direction Inputs..............................................................................8
3.3.2 EN input.....................................................................................................9
3.3.3 Fault Output.............................................................................................10
4 Switch Selection ........................................................................ 11
4.1 Microstep Resolution ....................................................................... 11
4.2 Running Current ..............................................................................12
4.3 Idle Current ......................................................................................12
4.4 Step Input Signal Filter ....................................................................12
4.5 Anti Resonance................................................................................12
4.6 Step Smoothing Filter ......................................................................13
4.7 Self Test ...........................................................................................13
4.8 Step/Direction Mode and CW/CCW Mode Jumper..........................13
5 Motor selection .......................................................................... 14
5.1 Recommended motors ....................................................................15
5.2 Torque-Speed Curves .....................................................................15
6 Error Codes ............................................................................... 16
7 Reference Materials .................................................................. 17
7.1 Mechanical Outline ..........................................................................17
7.2 Specications...................................................................................18
7.2.1 Electrical Specications...........................................................................18
7.2.2 Environmental Specications ..................................................................18
8 Contacting MOONS’.................................................................. 19

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SRAC2 User Manual
1 Introduction
Thank you for selecting the MOONS’ SRAC2 Step Motor Drive. The SRAC2 series AC input drives
are based on advanced digital current control technology and provide high torque, low noise and
low vibration. Many of the operational paramteres are switch selectable. We hope our dedication
to performance, quality and economy will make your motion control project successful.
1.1 Features
• Advanced digital current control provides excellent high speed torque
• Auto Setup measures motor parameters and congures motor current control and anti-
resonance gain settings
• Uses universal AC input 80 to 265 VAC, AC Input Voltage must be selected by switch
• Speed Range - up to 50 rps
• Microstep Resolution - switch selectable, 16 settings: 200, 400, 800, 1600, 3200, 6400,
12800, 25600, 1000, 2000, 4000, 5000, 8000, 10000, 20000, 25000 steps/rev
• Running Current - peak setting, switch selectable, 8 settings: 0.6A, 0.8A, 1.0A, 1.2A, 1.6A,
1.8A, 2.0A, 2.5A.
• Idle Current - automatic reduction of running current 1 second after the motor stops, switch
selectable, 2 settings: 50%, 90% of running current
• Anti Resonance - raises the system-damping ratio to eliminate midrange instability and allow
stable operation throughout the speed range of the motor, switch selectable, 2 settings for low
to high inertia loads
• Control Modes - Step/Direction pulse input or CW/CCW pulse input, internal jumper switch
selectable
• Input Signal Filter - lters out unwanted noise that can cause extra steps, switch selectable,
2MHz or 150KHz
• Step Smoothing Filter (Microstep Emulation) - performs high resolution stepping by
synthesizing coarse steps into ne micro-steps, switch selectable, ON or OFF
• Self Test - performs a1 rev, 0.5RPS, CW/CCW move test, switch selectable, ON or OFF
• Motor Selection - a 16 bit rotary switch is used to select the desired motor database which is
pre-loaded at the Factory

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1.2 Block diagram
2 Mounting the Drive
The SRAC2 drive can be mounted only on the narrow side of the chassis. M4 screws should be
used in the two holes at the back of the drive.
The ampliers in the drive generate heat. To operate the drive continuously at maximum power
forced air cooling, as from a fan, should be provided.
Never use the drive in a space where there is no air ow or where other devices can cause the
surrounding air to be more than 40 °C. Never put the drive where it can get wet or where metal
particles can fall into it.
Never use the drive in a space where there is no air ow or where other devices can
cause the surrounding air to be more than 40 °C
Never put the drive where it can get wet or where metal particles can fall into it
STEP
DIR
OUT
EN
Gate
Drivers
(3)
Optical
Isolation
output
Optical
Isolation
output
Over
Current
Det.
DSP
5V
switching
reg
MOSFETs
(6) motor
Voltage
Det.
10V
reg
3.3V
reg
LED
SRAC2
Block Diagram
Step Noise Filter
Load Inertia
Smoothing Filter
Self Test
Step Res 1
Step Res 2
Step Res 3
Step Res 4
Current Set 1
Current Set 2
Current Set 3
Idle Current
80～135VAC
AC Input
135～265VAC

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3 Connections
To use the SRAC2 Step Drive, the following items are needed:
• Universal AC input of 80 to 265 VAC
• Pulse & Direction signal
• A compatible step motor
• AC input voltage must be selected by switch

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3.1 Connecting to Power
Use the supplied connector to connect to the AC supply according to the diagram below. Use 16
AWG wire for Line (L) and Neutral (N). Use 14 AWG for Earth Ground (G).
AC input voltage must be selected by switch.Check input voltage avoiding damage
before power on!
80Vac<Input AC Voltage<135Vac: set the switch on 115V Status
135Vac<Input AC Voltage<265Vac: set the switch on 230V Status
The SRAC2 contains an internal 5A fast acting fuse.
Care should always be taken when working with high voltages.
3.2 Connecting to a Motor
Motor connections should be made according to the following diagrams.
Earth Ground (green)
Neutral (white)
Line-hot (black)

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White
Green
A
C
B
D
Brown
Yellow
Gray Blue
Red
Pink
A
Brown
Green
Pink
Blue
White
C
Yellow
D
Red
B
Gray

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3.3 Connecting the Inputs and Outputs
3.3.1 Step & Direction Inputs
The SRAC2 Step Drive has two high speed optically isolated inputs called STEP and DIR. They
accept 5 to 24 volt single-ended or di󰀨erential signals, up to 2MHz. The maximum voltage that can
be applied to the input is 28V.
The motor executes one step when the STEP input closes.
The direction of rotation is controlled by the DIR input state. A closed input (logic “0”) will result in
clockwise rotation, and an open input (logic “1”) will result in counterclockwise rotation.
SRAC2
SRAC2
SRAC2

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3.3.2 EN input
The EN input enables or disables the drive amplier. It is an optically isolated input that accepts
a 5 to 24 volt single-ended or di󰀨erential signal. The maximum voltage that can be applied to the
input is 28V.
When EN input is closed, the driver amplier is deactivated, all the MOSFETs will shut down, and
the motor will be free. When EN input is open, the drive is activated.
When the drive has encountered an error and the fault is removed from the system, a falling signal
into the EN input will reset the error status and activate the drive amplier again.
SRAC2
SRAC2
SRAC2

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3.3.3 Fault Output
The FAULT Output is optically isolated. The maximum collector current is 100mA, and the
maximum collector to emitter voltage is 30 volts. The output can be wired to sink or source current.
When drive is working normally, the output is open. When the drive encounters an error, the output
closes.
SRAC2
SRAC2
SRAC2
SRAC2

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4 Switch Selection
Many of the operational parameters of the SRAC2 can be set or changed by position switches -
either by a single switch or a combination of ON/OFF settings of 2 or more switches.
4.1 Microstep Resolution
The microstep resolution is set by the SW1, SW2, SW3 and SW4 switches. There are 16 settings.
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
Running Current Microstepping
SW9 SW10 SW11 SW12
Idle Current
Anti Resonance
Step Input Signal Filter
Self Test
Smoothing Filter
SW1
SW2
SW3
SW4
1234
1234 1234 1234 1234
1234 1234 1234 1234
1234 1234 1234 1234
1234 1234 1234 1234
Microstep(steps/rev) SW1 SW2 SW3 SW4
200 ON ON ON ON
400 OFF ON ON ON
800 ON OFF ON ON
1600 OFF OFF ON ON
3200 ON ON OFF ON
6400 OFF ON OFF ON
12800 ON OFF OFF ON
25600 OFF OFF OFF ON
1000 ON ON ON OFF
2000 OFF ON ON OFF
4000 ON OFF ON OFF
5000 OFF OFF ON OFF
8000 ON ON OFF OFF
10000 OFF ON OFF OFF
20000 ON OFF OFF OFF
25000 OFF OFF OFF OFF

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4.2 Running Current
The output current is set by the SW5, SW6 and SW7 switches. There are 8 settings.
Current (Peak) SW5 SW6 SW7
0.6A ON ON ON
0.8A OFF ON ON
1.0A ON OFF ON
1.2A OFF OFF ON
1.6A ON ON OFF
1.8A OFF ON OFF
2.0A ON OFF OFF
2.5A OFF OFF OFF
4.3 Idle Current
The running current of the SRAC2 drive is automatically reduced
whenever the motor isn’t moving. The SW8 switches control the
percentage of the running current the idle current is reduced to. The
90% setting is useful when a high holding torque is required. To
minimize motor and drive heating it is highly recommended that the idle current reduction feature
be set as low as the application can tolerate.
4.4 Step Input Signal Filter
SRAC2 Drive selects the digital signal lter frequency by SW9. Setting switch to “OFF” will select
high frequency 2MHz, and setting switch to “ON” will select low frequency 150 KHz.
Note: The power must be cycled each time the position of SW9 is changed.
4.5 Anti Resonance
The SW10 switches select the load inertia. There are 2 settings. The inertia selection can help the
SRAC2 drive to calculate the current control parameter. If the load inertia is close to that of the
motor rotor, the low setting should be selected. If the load inertia
is higher than that of the rotor, a proportionally higher setting
should be selected.
SW5
SW6
SW7
567 5 6 7 8 5 6 7 8 5 6 7 8 5 6 7 8
5 6 7 8 5 6 7 8 5 6 7 8 5 6 7 8
0.6A 0.8A 1.0A 1.2A
1.6A 1.8A 2.0A 2.5A
Idle SW8
50% ON
90% OFF
Option SW10 Inertia
0 ON Low
High
1 OFF

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4.6 Step Smoothing Filter
Command signal smoothing can soften the e󰀨ect of immediate changes in velocity and direction,
making the motion of the motor less jerky. An added advantage is that it can reduce the wear on
mechanical components. SW11 selects this function - ON enables it, OFF disables it.
This function can cause a small delay in following the control signal, and it should be used with
that in mind.
Note: The power must be cycled each time the position of SW11 is changed.
4.7 Self Test
Setting SW12 to ON after the drive is powered up, will cause the drive to perform a Self Test move
of 2 revolutions both CW and CCW at .5 rps. Setting SW16 to OFF will disable this feature.
4.8 Step/Direction Mode and CW/CCW Mode Jumper
Most indexers and motion controllers provide motion commands in the “Step and Direction“
format. The Step signal pulses once for each motor step and the direction signal commands
direction. However, a few PLCs use a di󰀨erent type of command signal: one signal pulses once
for each desired step in the clockwise direction (called STEP CW), while a second signal pulses
for counterclockwise motion (STE[ CCW). The SRAC2 drives can accept this type of signal if you
remove the drive cover and move jumper J10 from the “1-2“ position to the “2-3” position CCW
mode, the CW signal should be connected to the STEP input an DIR input.
1-2: Step & Direcion 2-3: Step CW & Step CCW

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5 Motor selection
Each position of the 16-bit rotary switch selects a di󰀨erent motor, and
automatically sets the conguration parameters in the drive. The SRAC2 drive
comes programmed with up to 16 typical motors as factory defaults. Drives
can be customized with specially selected motors when required.
When the motor selection is changed, the drive power supply will need
to be cycled.
BDC Position Motor Wiring Rated Current
Setting(A)
0 Reserved None
1 Reserved None
2 Reserved None
3 Reserved None
4 Reserved None
5 Reserved None
6 Reserved None
7 AM23HS2459 1
8 AM23HS3466 1
9 AM24HS5411 1
A AM34HD0802 Series Connected 1.8
B AM34HD1802 Series Connected 1.8
C AM34HD2805 Series Connected 1.8
D AM34HD4802 Series Connected 1.8
E AM34HD6801 Series Connected 1.8
F Motor_SRAC2 1.8
Note: The rated current of motor is RMS value. The output current of MOONS’ drive is the peak
of sine value. Drive peak current = the rated current of drive * 1.4

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5.1 Recommended motors
Model Shaft Wiring
Length“L” Holding
Torque
Rated
Current Resistance Rotor
Inertia
Motor
Mass Dielectric
Strength
mm N·m A/Phase Ω/Phase g·cm2Kg
AM23HS2459-01
Single Shaft
4 Leads
54 1.1
1
16.6 260 0.6
1500V AC
1 minute
AM23HS3466-01 76 1.8 25.4 460 1.0
AM24HS5411-01N Single Shaft 85 2.5 15.4 900 1.4
AM34HD0802-01 Single Shaft
8 Leads
Series
Connected
66.5 3
1.8
3.4 1100 1.6
AM34HD0802-02 Double Shaft
AM34HD4802-01 Single Shaft 75 3.5 3.6 1350 1.9
AM34HD1802-01 Single Shaft
96 5 3.6 1850 2.7
AM34HD1802-03 Double Shaft
AM34HD6801-01 Single Shaft 115 6.5 4 2400 3.5
AM34HD2805-01 Single Shaft
125.5 7.1 4.2 2750 3.8
AM34HD2805-03 Double Shaft
Note: The “Drive Current Setting” shown here di󰀨ers from the rated current of each motor
because the rated current is RMS and the drive current setting is peak sine. If you are using a
motor not listed here, for best results set the drive current at the motor’s rated current x 1.2.
5.2 Torque-Speed Curves
Speed(rps)
2
1.6
1.2
0.8
0.4
0
0 10 20 30 40
50
AM23HS3466
Drive: SRAC2
Microstep：10000 steps/rev
)mN(euqroT
.
1A(Rated Current)@ 220V
Speed(rps)
2.5
2
1.5
1
0.5
0
0 10 20 30 40
50
AM24HS5411
Drive: SRAC2
Microstep：10000 steps/rev
)mN(euqroT
.
1A(Rated Current)@ 220V
Drive: SRAC2
Microstep：25000 steps/rev
AM34HD4802
0 10 20 30 40 50
3.5
3.0
2.5
2.0
1.5
1.0
1.5
0
Speed(rps)
)
mN
(euqroT
.
1.8A(Rated current)@ 220V
Drive: SRAC2
Microstep：25000 steps/rev
AM34HD1802
0 10 20 30 40 50
6.0
5.0
4.0
3.0
2.0
1.0
0
Speed(rps)
)
mN
(euqroT
.
1.8A(Rated current)@ 220V
1.8A(Rated current)@ 220V
Drive: SRAC2
Microstep：25000 steps/rev
AM34HD2805
0 10 20 30 40 50
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
Speed(rps)
)
mN
(euqroT
.
Speed(rps)
1.5
1.2
0.9
0.6
0.3
0
0 10 20 30 40
50
AM23HS2459
Drive: SRAC2
Microstep：10000 steps/rev 1A(Rated Current)@ 220V
)mN(euqroT
.
Drive: SRAC2
Microstep：25000 steps/rev
AM34HD0802
0 10 20 30 40 50
Speed(rps)
3.0
2.5
2.0
1.5
1.0
0.5
0
)
mN
(euqroT
.
1.8A(Rated current)@ 220V
Drive: SRAC2
Microstep：25000 steps/rev
AM34HD6801
0 10 20 30 40 5
0
6.0
5.0
4.0
3.0
2.0
1.0
0
Speed(rps)
)
mN
(euqroT
.
1.8A(Rated current)@ 220V

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6 Error Codes
The SRAC2 Drive has two LEDs to indicate status. When the motor is enabled the green LED
ashes slowly, when the green LED is solid the motor is disabled. If the red LED ashes, an error
has occurred. Errors are indicated by combinations of red and green ashes as shown below:
Code Error
Solid green Motor Disabled
Flashing green Motor Enabled
3 red, 1 green Over Temperature
3 red, 2 green Bad Internal Voltage
4 red, 1 green Supply Voltage High
4 red, 2 green Supply Voltage Low
5 red, 1 green Over Current
5 red, 2 green Excess Regen
6 red, 1 green Open Motor Phase

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7 Reference Materials
7.1 Mechanical Outline
141
Status
IN/OUTMOTORLINE
OUT -
OUT +
EN -
EN+
DIR -
DIR+
STEP -
STEP +
A+
A -
B+
B -
L
N
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
SW11
SW12
SW
STEP MOTOR DRIVE
Made in China
LED C odes
SOLID GRE EN
GR - G R - GR
1GR + 4RD
1GR + 5RD
1GR + 6RD
2GR + 3RD
2GR + 4RD
1GR + 3RD
2GR + 5RD
GR=Green
RD=R ed
MO TOR DIS ABL ED
MO TOR ENA BLE D
SU PPLY V OLTAGE HIGH
OP EN MO TOR P HAS E
IN TER NAL V OLTAGE BAD
SU PPLY V OLTAGE LOW
OV ER CURRENT
OV ER TE MPE RATURE
EX CES S REG EN
Mo tor S elect
A
A
B
B
+
-
+
-
L
N
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
SW11
SW12
+
-
STEP
STEP
DI R +
DIR -
EN +
EN -
OUT+
OU T -Microstep Table
MS TE P SW 1 SW2 SW 3 SW4
200
400
800
16 00
32 00
64 00
12800
25600
10 00
20 00
40 00
50 00
80 00
10000
20000
25000
ON
ONON
ONON
OF F
ONON
ONON
ON O N
ONO FF
OF F
OF F
ON
ON
ON
OF F
ON
ON
ON O N
ONO FF
OF F
OF F
OF F
OF F
OF F
OF F
ON
ON
ON
OF F
ON
ON
ON O N
ONO FF
OF F
OF F
OF F
OF F
OF F
OF F
OF F
OF F
OF F
OF F
ON
OF F
ON O N
ONO FF
OF F
OF F
OF F
OF F
OF F
OF F
Cu r r ent Table
Cu rr ent S W5 SW 6 S W7
0. 4A
0. 8A
1. 2A
1. 5A
1. 8A
2. 0A
2. 2A
2. 5A
ON
ON
ON
OF F
ON
ON
ON O N
ONOF F
OF F
OF F
ON
OF F
ON O N
ONOF F
OF F
OF F
OF F
OF F
OF F
OF F
SW 12
ON
Se lf Tes t
OF F Di sable
Enab le
Smoothin g Fi lterSW 11
ON
OF F Di sable
Enab le
SW 8
Idle Cur re nt
ON 50 % Cu rr en t
OF F 90% Cu rr ent
SW 9
ON
Step N oise Fi lter
OF F 2M Hz
150K Hz
SW10
ON
Load I nerti a
OF F Hi gh
Low
Serial No Part No
AC i npu t vol tage be
in put v olt age
avoid ing d amage !
must
.
selected
by s wit ch Check
befo re pow er on
WARNIN G
SRAC
RoHS
110
Unit:mm
47.5
10.5
130.7
4.5
4.5

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7.2 Specications
7.2.1 Electrical Specications
Electrical Specications
Parameter Min. Typ. Max. Unit
Power Supply 80 - 265 VAC
Output Current (Peak) 0.6 - 2.5 A
Step Frequency 2 - 2M Hz
STEP Minimum Pulse Width Hi and Low 250 - - ns
DIR Minimum Pulse Width 62.5 - - us
Under Voltage Protection - 75*/135* - VAC
Over Voltage Protection - 145*/295* - VAC
STEP/DIR Input Signal Voltage 4.0 - 28 V
OUT mxinmum output current - - 100 mA
OUT maximum voltage - - 30 V
* Note: when the input switch is on 115V status, under voltage protection point is 75VAC, over voltage
protection point is 145VAC.
when the input switch is on 230V status, under voltage protection point is 135VAC, over voltage
protection point is 295VAC.
7.2.2 Environmental Specications
Environmental Specications
Heat Sinking Method Natural cooling or fan-forced cooling
Surrounding Air Conditions Avoid dust, oily mist and corrosive air
Operating Temperature 0 - 40°C (32 - 104°F)
Maximum Ambient Humidity 90% non-condensing
Shock 5.9m/s² maximum
Storage Temperature -10 - 70°C (14 - 158°F)

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8 Contacting MOONS’
400-820-9661
Customer Service Center
https://www.moonsindustries.com/
E-mail:[email protected]
MOONS’ Headquarter
Domestic Offices
Shenzhen
Rm.401, Building 53, Zhongchuang Park, Jiyue City, No.13,
Xinyi 5th Road, Taoyuan Street, Nanshan Dist, Shenzhen
518000, P.R. China
Nanjing
Room 1101-1102, Building 2, New Town Development
Center, No.126 Tianyuan Road, Moling Street,
Jiangning District, Nanjing 211106, P.R. China
Qingdao
Room 1710, Zhuoyue Tower, No.16 Fengcheng Road,
Shibei District, Qingdao 266000 P.R. China
Beijing
Room 1206, Jing Liang Mansion, No.16 Middle Road of East,
3rd Ring, Chaoyang District, Beijing 100022, P.R. China
Wuhan
Room 3001, World Trade Tower, 686 Jiefang Avenue,
Jianghan District, Wuhan 430022, P.R. China
Chengdu
Rm. 3907, Maoye Plaza, No.19, Dongyu Street,
Jinjiang Distrit, Chengdu 610066, P.R. China
Xi’an
Room 1006, Tower D, Wangzuo International City,
1 Tangyan Road, Xi’an 710065, P.R. China
Ningbo
Room 309, Tower B, Taifu Plaza, 565 Jiangjia Road,
Jiangdong District, Ningbo, 315040, P.R. China
Guangzhou
Room 4006, Tower B, China Shine Plaza, 9 Linhe Xi Road,
Tianhe District, Guangzhou 510610, P.R. China
Chongqing
Rm. 2108, South yuanzhu Buliding 20, No.18 Fuquan Rd.,
Jiangbei District, Chongqing 400000, P.R. China
North America Company
MOONS’ INDUSTRIES (AMERICA), INC.
(Chicago)
1113 North Prospect Avenue, Itasca, IL 60143 USA
MOONS’ INDUSTRIES (AMERICA), INC.
(Boston)
36 Cordage Park Circle, Suite 310 Plymouth, MA 02360 USA
APPLIED MOTION PRODUCTS, INC.
404 Westridge Dr. Watsonville, CA 95076 USA
LIN ENGINEERING, INC.
16245 Vineyard Blvd., Morgan Hill, CA 95037 USA
European Company
MOONS’ INDUSTRIES (EUROPE) S.R.L.
Via Torri Bianche n.1 20871 Vimercate(MB) Italy
AMP & MOONS’ AUTOMATION (GERMANY) GMBH
Börsenstr. 14
60313 Frankfurt am Main Germany
South-East ASIA Company
MOONS’ INDUSTRIES (SOUTH-EAST ASIA) PTE. LTD.
33 Ubi Avenue 3 #08-23 Vertex Singapore 408868
Japan Company
MOONS’ INDUSTRIES JAPAN CO., LTD.
Room 602, 6F, Shin Yokohama Koushin Building,
2-12-1, Shin-Yokohama, Kohoku-ku, Yokohama,
Kanagawa, 222-0033, Janpan
India Company
MOONS' INTELLIGENT MOTION SYSTEM INDIA PVT. LTD.
Rm. 908, 9th Floor, Amar Business Park,
Tal. Haveli, Baner, Pune-411045, Maharashtra, India
168 Mingjia Road, Minhang District, Shanghai
201107, P.R. China
• All the specifications, technical parameters of the products provided in this catalog are for reference only, subject to change without notice.
For the latest details, please contact our sales department.