4
vacon • 28 Active Front End (AFE)
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
Control connections
Analogue input voltage
0…+10 V, R
i
= 200 kΩ.
Resolution 0.1% (12-bit), accuracy ±1%
Analogue input current
0(4)…20 mA, R
i
= 250 Ω differential
Digital inputs (6) Positive or negative logic; 18…30 VDC
Auxiliary voltage +24 V, ±15%, max. 250 mA
Reference voltage,
output
+10 V, +3%, max. load 10 mA
Analogue output (1)
0(4)…20 mA; R
L
max. 500 Ω; Resolution 10 bit;
Accuracy ±2%
Digital outputs Open collector output, 50 mA / 48 V.
Relay outputs
2 programmable changeover relay outputs
Switching capacity (resistive): 24 VDC / 8 A, 250 VAC
/ 8 A, 125 VDC / 0.4 A.
Min. switching load: 5 V / 10 mA.
Protection
Overvoltage protection
Undervoltage protection
NXA_5: 911 VDC; NXA_6: 1200 VDC
NXA_5: 333 VDC; NXA_6: 461 VDC
Earth fault protection
In case of earth fault in the supply cable, the earth
fault protection only protects the NX-AFE itself.
Input phase monitoring Trips if any of the input phases is missing.
Overcurrent protection Yes
Unit over-temperature
protection
Yes
Short-circuit protection
of +24 V and +10 V
reference voltages
Yes
Table 7. Technical specification for VACON
®
NXA Active Front End unit
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