Analog Inputs; Pulse/Encoder Inputs - Danfoss VLT Ea4 Operating Manual

VLT Ea4 Parallel Drive Modules
Operating Guide
Typical input current at 20 V
Input capacitance
All digital inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
For further information about terminal 37 and Safe Torque Off, see the VLT
When using a contactor with a DC coil inside with STO, it is important to make a return way for the current from the coil when
turning it off. The return way can be created by using a freewheel diode (or, alternatively, a 30 V or 50 V MOV for quicker response
time) across the coil. Typical contactors can be bought with this diode.

7.7.3 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.
+24 V
Control
18
37
Functional
isolation
RS485
Illustration 29: PELV Isolation

7.7.4 Pulse/encoder Inputs

Programmable pulse/encoder inputs
Terminal number (pulse)
Terminal number (encoder)
Maximum frequency at terminals 29, 32, 33
Maximum frequency at terminals 29, 32, 33
Maximum frequency at terminals 29, 32, 33
Voltage level
Maximum voltage on input
Input resistance, R
i
Pulse input accuracy (0.1–1 kHz)
70 | Danfoss A/S © 2023.01
PELV isolation
Mains
High
Motor
voltage
DC-bus
FC Series- Safe Torque Off Operating Guide.
®
Switch A53 (S201) and switch A54 (S202)
Switch A53 (S201)/A54 (S202) = OFF (U)
Switch A53 (S201)/A54 (S202) = ON (I)
Maximum error 0.5% of full scale
Maximum error: 0.1% of full scale
AQ434333248451en-000101 / 130R1286
Specifications
60 mA rms
400 nF
2
53 (201), 54 (202)
Voltage or current
-10 V to +10 V (scaleable)
Approximately 10 kΩ
±20 V
0/4 to 20 mA (scaleable)
Approximately 200 Ω
30 mA
10 bit (+ sign)
100 Hz
2/1
29 , 33
(1)
32, 33
(2)
110 kHz (Push-pull driven)
5 kHz (Open collector)
4 Hz
See Digital Inputs.
28 V DC
Approximately 4 kΩ