Danfoss VLT 380-500 V Design Manual page 57

Specifications
Maximum voltage on input
Typical input current at 24 V
Typical input current at 20 V
Input capacitance
All digital inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
®
1) See VLT Frequency Converters – Safe Torque Off Operating Guide for further information about terminal 37 and Safe Torque
Off.
2) When using a contactor with a DC coil with STO, always make a return path for the current from the coil when turning it off.
The return path can be made by using a freewheel diode across the coil. Alternatively, use a 30 V or 50 V MOV for quicker
response time. Typical contactors can be bought with this diode.
Analog inputs
Number of analog inputs
Terminal number
Modes
Mode select
Voltage mode
Voltage level
Input resistance, R
i
Maximum voltage
Current mode
Current level
Input resistance, R
i
Maximum current
Resolution for analog inputs
Accuracy of analog inputs
Bandwidth
The analog inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
+24V
Control
18
37
Functional
isolation
RS485
Illustration 6.18 PELV Isolation
Pulse input
Programmable pulse
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 (0.1–1 kHz)
Encoder input accuracy (1–11 kHz)
The pulse and encoder inputs (terminals 29, 32, 33) are galvanically isolated from the supply voltage (PELV) and other high-
voltage terminals.
1) Pulse inputs are 29 and 33.
MG37N102
Design Guide
PELV isolation
Mains
High
Motor
voltage
DC-Bus
Danfoss A/S © 6/2016 All rights reserved.
28 V DC
50 mA
60 mA
400 nF
53, 54
Voltage or current
Switch S201 and switch S202
Switch S201/switch S202 = OFF (U)
-10 V to +10 V (scalable)
Approximately 10 kΩ
±20 V
Switch S201/switch S202 = ON (I)
0/4–20 mA (scalable)
Approximately 200 Ω
30 mA
10 bit (+ sign)
Maximum error 0.5% of full scale
20 Hz/100 Hz
1)
29 , 32/33
110 kHz (Push-pull driven)
5 kHz (open collector)
0–24 V DC
28 V DC
Approximately 4 kΩ
Maximum error: 0.1% of full scale
Maximum error: 0.05% of full scale
rms
rms
2
6 6
2/1
4 Hz
55