Danfoss VLT Ea4, Operating Manual

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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.
For further information about terminal 37 and Safe Torque Off, see the
VLT
®
FC Series- Safe Torque Off Operating Guide .
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 2
Terminal number 53 (201), 54 (202)
Modes Voltage or current
Mode select Switch A53 (S201) and switch A54 (S202)
Voltage mode Switch A53 (S201)/A54 (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 A53 (S201)/A54 (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.
Mains
Functional
isolation
PELV isolation
Motor
DC-bus
High
voltage
Control
+24 V
RS485
18
37
e
3
0
b
a
1
1
7
.1
1
Illustration 29: PELV Isolation
7.7.4 Pulse/encoder Inputs
Programmable pulse/encoder inputs 2/1
Terminal number (pulse) 29
(1)
, 33
Terminal number (encoder) 32, 33
(2)
Maximum frequency at terminals 29, 32, 33 110 kHz (Push-pull driven)
Maximum frequency at terminals 29, 32, 33 5 kHz (Open collector)
Maximum frequency at terminals 29, 32, 33 4 Hz
Voltage level See Digital Inputs .
Maximum voltage on input 28 V DC
Input resistance, R
i
Approximately 4 kΩ
Pulse input accuracy (0.1–1 kHz) Maximum error: 0.1% of full scale
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Specifications
VLT Ea4 Parallel Drive Modules
Operating Guide