Danfoss VLT Design Manual page 114

General Specifications and ...
(Duty cycle) Min. pulse width
Input resistance, R
i
3, 4)
Safe Stop 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.
1)
Terminals 27 and 29 can also be programmed as output.
2)
Except Safe Stop input Terminal 37.
3)
See for further information about terminal 37 and Safe Stop.
4)
When using a contactor with a DC coil inside in combination with Safe Stop, 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 or 50 V MOV for
quicker response time) across the coil. 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
Max. voltage
Current mode
Current level
Input resistance, R
i
Max. 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.
Illustration 8.1
Pulse inputs
Programmable pulse
Terminal number pulse
Max. frequency at terminal 29, 32, 33
Max. frequency at terminal 29, 32, 33
Min. frequency at terminal 29, 32, 33
Voltage level
Maximum voltage on input
®
VLT Refrigeration Drive Design Guide
®
MG16G102 - VLT is a registered Danfoss trademark
4.5 ms
approx. 4 kΩ
0-24 V DC
<4 V DC
>20 V DC
28 V DC
50 mA rms
60 mA rms
400 nF
53, 54
Voltage or current
Switch S201 and switch S202
Switch S201/switch S202 = OFF (U)
-10 to +10 V (scaleable)
approx. 10 kΩ
±20 V
Switch S201/switch S202 = ON (I)
0/4 to 20 mA (scaleable)
approx. 200 Ω
30 mA
10 bit (+ sign)
Max. error 0.5% of full scale
100 Hz
1) 2)
29, 33 /32
110 kHz (Push-pull driven)
5 kHz (open collector)
see 8.1.2 Digital Inputs
28 V DC
2
8 8
2/1
2)
, 33
4 Hz
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