Maximum voltage on input
28 V DC
Typical input current at 24 V
50 mA
rms
Typical input current at 20 V
60 mA
rms
Input capacitance
400 nF
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
2
Terminal number
53, 54
Modes
Voltage or current
Mode select
Switch S201 and switch S202
Voltage mode
Switch S201/switch S202 = OFF (U)
Voltage level
-10 V to +10 V (scalable)
Input resistance, R
i
Approximately 10 k
Ω
Maximum voltage
±
20 V
Current mode
Switch S201/switch S202 = ON (I)
Current level
0/4–20 mA (scalable)
Input resistance, R
i
Approximately 200
Ω
Maximum current
30 mA
Resolution for analog inputs
10 bit (+ sign)
Accuracy of analog inputs
Maximum error 0.5% of full scale
Bandwidth
20 Hz/100 Hz
The analog inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
Mains
Functional
isolation
PELV isolation
Motor
DC-Bus
High
voltage
Control
+24V
RS485
18
37
130BA117.10
Illustration 6.18 PELV Isolation
Pulse input
Programmable pulse
2/1
Terminal number pulse
29
1)
, 32/33
Maximum frequency at terminal 29, 33
110 kHz (Push-pull driven)
Maximum frequency at terminal 29, 33
5 kHz (open collector)
Minimum frequency at terminal 29, 33
4 Hz
Voltage level
0–24 V DC
Maximum voltage on input
28 V DC
Input resistance, R
i
Approximately 4 k
Ω
Pulse input accuracy (0.1–1 kHz)
Maximum error: 0.1% of full scale
Encoder input accuracy (1–11 kHz)
Maximum error: 0.05% of full scale
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.
Specifications
Design Guide
MG37N102
Danfoss A/S © 6/2016 All rights reserved.
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Summary of Contents for VLT 380-500 V
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