Acorn CNC

Relay Board Kit

Centroid Acorn CNC Relay Board Kit

Software version: CNC12 V.4.12+
Models: Acorn CNC

Plug and Play Relay Outputs with the Acorn CNC Relay Board kit.

This kit will convert Acorn’s six open collector outputs into Relay Outputs in under a minute. The kit uses an off the shelf
SainSmart “8 Relay Module” combined with Centroid’s Relay Module Adapter Card and a ribbon cable for easy installa-
tion. The adapter card simply inserts into the Acorn Output Connector header screw terminals. Powered by 5 Volts DC the
Adapter card comes with a pre-installed 5 VDC pig tail which connects to the 5 VDC terminal on the Acorn Logic Power
supply. This allows CNC controlled connections to various CNC devices such as VFD’s, solenoids, lights, fans, pumps,
motors, other larger relays and contactors in a compact format. The 8 relay module contains eight SPDT (Single Pole
Double Throw) high current relays (10 AMPS at 250 VAC,and 10 amps at 30 VDC) which can directly control any device
rated at or below the maximum rating of the relays. If higher current devices are required these relays can then in turn
control larger relays or contactors to control the higher current device.

Acorn Relay Board Kit Includes:

- SainSmart “8 Relay Module”
- Ribbon Cable
- Acorn Relay Adapter Card with 5 vdc pig tail.

acorn_relay_board_kit.pdf 10-22-18 rev5 Copyright © 2018 CENTROID

www.centroidcnc.com Page 1
 Acorn Outputs Numbers 3 through 8 are utilized to control the relays on the SainSmart 8 Relay Module

SainSmart Relay # Identification

Output LED indicators

Spare Relay 1

Spare Relay 2

Acorn Open Collector Output #’s

Relay #3
COM
#8 -
#7 - Relay #4
COM
#6 -
#5 -
Relay #5
COM
#4 -
#3 -
Relay #6

Relay #7

Relay #8

Acorn on-board Relay Output 1

Acorn on-board Relay Output 2

To +5 VDC

Acorn Output Number ...controls SainSmart Relay Number

3 3
4 4
5 5
6 6
7 7 and 2 *
8 8 and 1 *

* Note: Acorn Output #7 activates both SainSmart Relay #7 and Spare Relay #2
Acorn Output #8 activates both SainSmart Relay #8 and Spare Relay #1

Page 2
Installation of the Acorn Relay adapter card.
1.) Bench Test the Acorn CNC control board without the Relay board connected to verify CNC12 Communication to
Acorn. See videos on the forum for Acorn Bench Test procedure. After successful Acorn Bench test,
with the power off, insert the Centroid Adapter card into the Acorn connector and tighten down the terminal screws.

2.) Reinsert the Acorn Output connector onto the Acorn board.
Be sure to make sure the ribbon cable is connected “straight through” from the Centroid Relay Adapter card to the
SainSmart relay module. Both connectors are labeled at the base of the connector for your reference.
Do not flip the ribbon cable.

3.) With the power off, connect the red pig tail wire from the Centroid Relay Adapter card to the 5 VDC terminal on the
Logic power supply.

+5 VDC

Page 3
4.) Bench Test the Relay Kit: Power up Acorn wait for heart beat and then start CNC12. At the main screen press
<Alt i> to enter the PLC diagnostic menu. Navigate the cursor box to the Output #3 indicator LED and toggle the
output with the hot keys < CRTL ALT F> and observe the LED’s on the SainSmart Relay Module, do the same for
outputs 4,5,6,7 and 8. When you toggle you will see the LED on the SainSmart module light up and hear a distinct
click” noise from the relay(s). Cycle through each one and verify that the Relays and Outputs are working.
< CTRL ALT F> is a 3 step cycle: force on, force off, and normal. Press < CTRL ALT F > again to cycle through.

= Output OFF = Output ON

< CTRL ALT F > to toggle the outputs

Page 4
On the SainSmart Relay Module when the LED is ON (Red) the Acorn Output is ON and the Relay is energized. When the
SainSmart Relay Module LED is off the Acorn Output is off and the relay is not energized.

Acorn Outputs #3 through #8 are ON

SainSmart Relay #’s 3 thru 8 are ON

(as well as Spare Relay #1 and #2)

Page 5
5.) Use the Acorn CNC setup Wizard to configure the Relays for a particular purpose. When selecting a Drive Type
the I/O map automatically populates with the Centroid Acorn defaults for the input and output definitions that match
the corresponding Acorn schematic for that drive type. Use the defaults I/O map as is or customize it by selecting
any one of the custom output labels in the drop down box.

The example above shows the standard Leadshine input and output map with Output 8 customized.
We used the drop-down list for Output 8 and selected the generic output label “OUTPUT8”.
These generic output labels are available for the case where the output drop down list does not contain an output label
to match a particular application. These are general purpose Labels that use M codes M61 thru M68 and M81 thru M88.
For example: You may use the generic label “OUTPUT3” for Output 3 and then use M63 to activate the #3 relay and M83
to turn off relay #3, you may use the generic “OUTPUT4” for Output 4 and use M64 to activate the #4 relay and M84 to
turn off relay #4, and so on for outputs 5,6,7..and 8. Use generic “OUTPUT8” for Output 8 and use M68 to activate the #8
relay and M88 to turn off relay #8.

Page 6
6.) Connect devices to be controlled to the Relay Module terminals.

The relays on the SainSmart Relay Module are single pole double throw (SPDT) relays. Relays are just a switch. SPDT
relays are a switch with connections on either side of the switch so when the switch is ON two of the terminals are con-
nected and when the relay is OFF the other two of the terminals are connected. That is, a common terminal connects to
either of two others, never connecting to both at the same time. Each relay has three connection terminals as see in the
image below.

110 VAC Flood Pump wiring example using Output 7 set to “Flood”. The number 7 relay will be energized when “Flood” is
activated by either manually using the Coolant controls on the VCP or by using the M-code “M8”.

Relay Terminal #3 NC
Relay Terminal #2 Common
Relay Terminal #1 NO

Ground

110 VAC
Flood Motor
110 VAC Neutral
From Terminal
distribution

LED ON = Relay Energized = Terminal #2 (cen- 110 VAC Hot

ter common) and Terminal #1 are closed and the from fused terminal
Flood motor is running distribution

Page 7
 VFD OPTIONAL CONNECTIONS ARE BLUE Title:

FAULT RESET VFD RESET GROUNDS ARE GREEN ACORN_rev3, 4 BIT Gray Code Turret Lathe
SPIN REVERSE 110VAC IS VIOLET
SPIN REVERSE Date: 180904 Ver: 1
Drawn by: CEM
SPIN FORWARD
SPIN FORWARD
INPUT COMMON VFD COMMON Filename: TURRET_LATHE-DRAFT.DWG Sheet 1 of 1
VFD CABLE
0-10VDC COMMON
0-10VDC COM How to tell the difference between Acorn_rev2 and Acorn_rev3
0-10VDC ANALOG Acorn_rev2 has FIXED green screw terminal blocks
0-10VDC Acorn_rev3 has REMOVABLE green screw terminal blocks
SPINDLE OK
FAULT RELAY
NORMALLY COM
CLOSED
BIT1 BIT1 BIT1 TURRET
BIT2 BIT2 B1
BIT2 B2
BIT3 BIT3 BIT3
BIT4 B3
BIT4 BIT4 B4
COM COM 24V COM
COM E-STOP SIGNAL +24VDC +24VDC +24VDC +24VDC
SPINDLE OK VFD CABLE

+24VDC
24V COM
HOME ALL SWITCHES

FG TURRET
MOTOR
COM

Z-AXIS X-AXIS
DRIVE DRIVE
E-STOP SIGNAL

OPTIONAL E-STOP
CONTACTOR
DIRECTION

DIRECTION
COMMON

COMMON
DRIVE OK

A1 A2
ENABLE

ENABLE
COIL
L4 T4
+24VDC

STEP

STEP

L3 T3

COM
5VDC NPN L2 T2 CNT1
RELAY BOARD NC
L1 T1
T1 L1 +24VDC TURRET
H1 H2 H3 T2 L2 24V COM MOTOR
POWER
EN2
EN1

DR3
EN3
COM

EN4
COM
DR1

COM
DR2

ST3

ST4
COM
ST1

ST2

DR4
24 IN
IN5
IN6
IN7
IN8

T3 L3

H4 H5 NC REVERSE 22NC 21NC

+24VDC 24 IN COM A2
COIL
A1
COIL POWER
BIT4 IN4 OC8 SUPPLY

ADAPT8RLY REV 180629

GND
GND T1 L1
BIT3 IN3 OC7 IN1 T2 L2
RY1
BIT2 IN2 IN2

ACORN
COM RY2 IN3
T3 L3

BIT1
RY3 IN4 SPIN FORWARD FORWARD 22NC 21NC
IN1 OC6 RY4 IN5 A2 A1
REV 180131 RY5 IN6
COIL
OC5
H6 PN:14445 RY6 IN7 VFD COMMON
RY7 VFD CABLE
COM 25
13 Input 4 COM
RY8
IN8 SPIN REVERSE CNT2
H6 12 Input 3 VCC
13
24
11 Input 2 OC4 5V
23
10 Input 1
25
22 OC3 5V
21
9 Direction 4 VFD RESET RELAY COIL POWER
8 Step 4
20
7 Direction 3
19 NC2 CONTACTOR COIL POWER
+24VDC

6 Step 3
18
Direction 2 FLOOD PUMP CONTACTOR
COM

Output 4 17
5 P10 NO2
4 Step 2
Output 3 16 PIN 5 = B\
3 Direction 1 PIN 9 = +5VDC GND
Input 5 15
2 Step 1 PIN 8 = B PIN 4 = A\ RL2
Output 2 14 Output 1 PIN 7 = A PIN 3 = Z\ VCC
1
PIN 2 = COM NC1 JD-VCC
PIN 6 = Z
Chassis GND PIN 1 = N/C
NO1
P10 5 RL1
CHASSIS

14 9
ETHERNET
AN GND
AN OUT

+24VDC
+24VDC

1
H7
COM
COM

6
1 SNUBBER
H8 H9
BLK MEANWELL
FROM SPINDLE ENCODER L
RD-35B
110VAC WHT ACH LUBE
VFD CABLE 0-10VDC COM GRN
N
0-10VDC GRN ACN PUMP
YEL YEL ACG
SHIELDED ETHERNET CABLE FROM PC V2 (+24 VDC) 1.0A
COM COM BLK BLK COM
+24VDC +24VDC RED V1 (+5 VDC) 2.2A 110VAC