ABB ACS 800 Series, Hardware Manual

Page: 58 / 101

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Motor Control and I/O Board (RMIO)
Digital inputs
With Standard Application Program six programmable digital inputs (common
ground: 24 VDC, -15% to +20%) and a start interlock input. Group isolated, can be
divided in two isolated groups (see
"Isolation and grounding diagram" below).
Thermistor input: 5 mA, < 1.5 kohm “1” (normal temperature), > 4 kohm “0”
(high temperature), open circuit “0” (high temperature).
Internal supply for digital inputs (+24 VDC): short-circuit proof. An external 24 VDC
supply can be used instead of the internal supply.
Isolation test voltage 500 VAC, 1 min
Logical thresholds < 8 VDC “0”, > 12 VDC “1”
Input current DI1 to DI 5: 10 mA, DI6: 5 mA
Filtering time constant 1 ms
Relay outputs
Three programmable relay outputs
Switching capacity 8 A at 24 VDC or 250 VAC, 0.4 A at 120 VDC
Minimum continuous current 5 mA rms at 24 VDC
Maximum continuous current 2 A rms
Isolation test voltage 4 kVAC, 1 minute
DDCS fiber optic link
With optional communication adapter module RDCO. Protocol: DDCS (ABB
Distributed Drives Communication System)
24 VDC power input
Voltage 24 VDC ± 10%
Typical current consumption
(without optional modules) 250 mA
Maximum current consumption 1200 mA (with optional modules inserted)
The terminals on the RMIO board as well as on the optional modules attachable to the board fulfil the Protective Extra
Low Voltage (PELV) requirements stated in EN 50178 provided that the external circuits connected to the terminals also
fulfil the requirements.