Appendix A – ACS/ACC/ACP 601 Technical Data
A-16 ACS/ACC/ACP 601 Frequency Converters
Digital Inputs
ACS/ACP 600: Six Programmable Digital 
Inputs (Common Ground): 24 VDC, -15 % to 
+20 %
ACC 600: Six Digital Inputs (Common 
Ground): 24 VDC, -15 % to +20 %
Logical Thresholds: < 8 VDC   “0”, 
> 12 VDC   “1”
Input Current: DI1 to DI 5: 10 mA, DI6: 5 mA
Filtering Time Constant: 1ms
Thermistor Input: 5 mA, < 1.5 kΩ “1” 
(normal temperature), > 4 kΩ   “0” (high 
temperature), Open Circuit   “0” (high 
temperature)
Internal Supply For Digital Inputs 
(+24 VDC): Short circuit proof, group isolated
Isolation Test Voltage: 500 VAC, 1 minute
Input Updating Time: 12 ms (ACS 600), 
44 ms (ACC 600), 4 ms (ACP 600) 
An external 24 VDC supply can be used 
instead of the internal supply. 
12 Programmable Digital Inputs (Common 
Ground): 24 VDC, -15 % to +20 %
Logical Thresholds: < 8 VDC   “0”, 
> 12 VDC   “1”
Filtering Time Constant: ≤ 50 µs 
DI 11 and DI 12 can be used for time 
measurement between two external events 
(PROBE1 and PROBE2).
Internal Supply For Digital Inputs 
(+24 VDC): Short circuit proof, group isolated
Isolation Test Voltage: 500 VAC, 1 minute
Input Updating Time: 1 ms  
An external 24 VDC supply can be used 
instead of the internal supply. 
Filtering Time Constant: ≤ 100 µs 
Digital Outputs
-
Four Programmable Digital Outputs: Short 
circuit proof, Overload protection
Maximum Load: 10 mA with internal 24 V 
supply, 100 mA with external supply
Output Updating Time: 2 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
Contact Material: Silver Cadmium Oxide 
(AgCdO)
Isolation Test Voltage: 4 kVAC, 1 minute
Output Updating Time: 100 ms (ACS 600), 
44 ms (ACC 600), 8 ms (ACP 600)
One Relay Output
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
Max Continuous Current: 2Arms
Contact Material: Silver Cadmium Oxide 
(AgCdO)
Isolation Test Voltage: 4 kVAC, 1 minute
Output Updating Time: 2 ms
DDCS Fibre Optic 
Link
Protocol: DDCS (ABB Distributed Drives Communication System)
Modbus 
Communication 
Link
RS 485
Transmission Rate: Max. 9600 bit/s
Parity: Selectable
Connectors: Shielded modular 
telecommunication socket
ACS/ACC/ACP 600
NIOC-01 Board 
ACP 600
NIOCP-01 Board