Danfoss VLT FC 280 Operating Manual page 123

VLT® Midi Drive FC 280
Operating Guide
37
Control
38
33
Functional
isolation
RS485
Illustration 52: Galvanic Isolation
HIGH ALTITUDE
-
For installation at altitudes above 2000 m (6562 ft), contact Danfoss hotline regarding PELV.
9.6.4 Pulse Inputs
Programmable pulse inputs
Terminal number pulse
Maximum frequency at terminal 29, 33
Maximum frequency at terminal 29, 33
Minimum frequency at terminal 29, 33
Voltage level
Maximum voltage on input
Input resistance, R
i
Pulse input accuracy
9.6.5 Digital Outputs
Programmable digital/pulse outputs
Terminal number
Voltage level at digital/frequency output
Maximum output current (sink or source)
Maximum load at frequency output
Maximum capacitive load at frequency output
Minimum output frequency at frequency output
Maximum output frequency at frequency output
Accuracy of frequency output
Resolution of frequency output
Terminal 27 can also be programmed as input.
1
The digital output is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
9.6.6 Control Card, 24 V DC Output
Terminal number
Maximum load
The 24 V DC supply is galvanically isolated from the supply voltage (PELV). However, the supply has the same potential as the ana-
log and digital inputs and outputs.
Danfoss A/S © 2022.02
PELV isolation
Mains
High
Motor
voltage
DC bus
N O T I C E
Specifications
32 kHz (push-pull driven)
5 kHz (open collector)
See the section on digital input
Approximately 4 kΩ
Maximum error: 0.1% of full scale
Maximum error: 0.1% of full scale
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2
29, 33
4 Hz
28 V DC
1
27
(1)
0–24 V
40 mA
1 kΩ
10 nF
4 Hz
32 kHz
10 bit
12, 13
100 mA