Terminal number
18, 19, 27
(1)
, 29
(1)
, 32, 33
Logic
PNP or NPN
Voltage level
0–24 V DC
Voltage level, logic 0 PNP
<5 V DC
Voltage level, logic 1, PNP
>10 V DC
Voltage level, logic 0 NPN
(2)
>19 V DC
Voltage level, logic 1 NPN
(2)
<14 V DC
Maximum voltage on input
28 V DC
Pulse frequency range
0–110 kHz
(Duty cycle) minimum pulse width
4.5 ms
Input resistance, R
i
Approximately 4 kΩ
1
Terminals 27 and 29 can also be programmed as output.
2
Except STO input terminal 37.
5.3.2 STO Terminal 37 (Terminal 37 is Fixed PNP Logic)
Voltage level
0–24 V DC
Voltage level, logic 0 PNP
<4 V DC
Voltage level, logic 1 PNP
>20 V DC
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.
When using a contactor with a DC coil inside in combination with STO, it is important to make a return way for the current from the
coil when turning it off. This can be done 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.
5.3.3 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 (scaleable)
Input resistance, R
i
Approximately 10 kΩ
Maximum voltage
±20 V
Current mode
Switch S201/S202 = ON (I)
Current level
0/4 to 20 mA (scaleable)
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
100 Hz
The analog inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
AN354546796134en-000201 / 130R0954 | 31
Danfoss A/S © 2021.05
Specifications
VLT®AutomationDrive EZ FC 321
Installation Guide
