Sto Terminal; Analog Inputs - Danfoss VLT HVAC Drive FC 102 Operating Manual

Operating Guide | VLT® HVAC Drive FC 102
Programmable digital inputs
Terminal number (1)
Logic
Voltage level
Voltage level, logic 0 PNP
Voltage level, logic 1, PNP
Voltage level, logic 0 NPN
Voltage level, logic 1 NPN
Maximum voltage on input
Pulse frequency range
Input resistance, R
i
1
Terminals 27 and 29 can also be programmed as output.

9.6.2 STO Terminal 37

STO terminal 37 (terminal 37 is fixed PNP logic)
Voltage level
Voltage level, logic 0 PNP
Voltage level, logic 1 PNP
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.
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.

9.6.3 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
134 | Danfoss A/S © 2020.01
®
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)
AQ275556502253en-000101 / 130R0706
Specifications
4 (6)
18, 19, 27, 29, 32, 33
PNP or NPN
0–24 V DC
<5 V DC
>10 V DC
>19 V DC
<14 V DC
28 V DC
0–110 kHz
Approximately 4 kΩ
0–24 V DC
<4 V DC
>20 V DC
28 V DC
50 mA rms
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)