IAI America RCP2-CF - Manual (Page 49)

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4.2.3 Wiring the Power Supply/Motor Power Cutoff Relay
(1) Wiring the power supply
To connect multiple controllers, provide a relay terminal block.
Use a power cable satisfying the following specifications:
Item Specification
Applicable wire length Single wire:
1.0 / Stranded: 0.8 mm 2
, AWG size 18 (copper wire)
Stripped wire length 10 mm
Temperature rating of
insulating sheath
60
C or above
* Use a flathead screwdriver with a blade tip of approx. 2.6 mm to push in the wire.
 Notes on wiring the absolute-specification controller
[1] When connecting a relay to the 24-V line, be sure to install it on the positive side of the 24-V power supply.
Keep the negative side of the 24-V power supply connected without cutting it off with a relay.
If a relay is installed on both the positive and negative sides, an ABS error may generate.
[2] Connect a surge killer to the relay contact.
Chattering of the relay may have negative effect on the controller.
Connect a surge killer to prevent malfunction.
Recommended product: Spark Killer by Okaya Electric
Industries
Model number: CR-50500
Capacitance: 0.5
F  20%
Resistance: 50
 (1/2W)  30%
24V
0V
FG
S1
S2
MPI
MPO
24V
N
FG
Input power supply
24 VDC
(2 A max. per controller)
Surge killer
Relay
Do not install a relay on the negative side.
RCP2-
ABS
24V+
N
24VPS AC