Analog Inputs; Pulse/Encoder Inputs - Danfoss VLT FC 102 Operating Manual

VLT HVAC Drive FC 102
Operating Guide
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.

8.9.3 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 33: PELV Isolation

8.9.4 Pulse/Encoder Inputs

Programmable pulse
Terminal number pulse
Maximum frequency at terminals 29, 33
Maximum frequency at terminals 29, 33
Maximum frequency at terminals 29, 33
Voltage level
Maximum voltage on input
Input resistance, R
i
Pulse input accuracy (0.1–1 kHz)
Encoder input accuracy (1–11 kHz)
Pulse inputs are 29 and 33.
1
The pulse and encoder inputs (terminals 29 and 33) are galvanically isolated from the supply voltage (PELV) and other high-voltage
terminals.
Danfoss A/S © 2023.09
PELV isolation
Mains
High
Motor
voltage
DC-bus
Specifications
Voltage or current
Switch S201 and switch S202
Switch S201/switch S202 = OFF (U)
-10 V to +10 V (scaleable)
Approximately 10 kΩ
Switch S201/S202 = ON (I)
0/4 to 20 mA (scaleable)
Approximately 200 Ω
10 bit (+ sign)
Maximum error 0.5% of full scale
20 Hz/100 Hz
110 kHz (Push-pull driven)
5 kHz (Open collector)
See 8.9.1 Digital
Approximately 4 kΩ
Maximum error: 0.1% of full scale
Maximum error: 0.05% of full scale
AQ267037536117en-000101 / 130R0083 | 99
2
53, 54
±20 V
30 mA
2/1
29, 33/33
(1)
4 Hz
Inputs.
28 V DC