Protection and Features
•
Electronic thermal motor protection against overload.
•
Temperature monitoring of the heatsink ensures that the adjustable frequency drive trips if the temperature
reaches a predefined level. An overload temperature cannot be reset until the temperature of the heatsink is
below the values stated in the tables on the following pages. Note that these temperatures may vary for different
power sizes, frame sizes, enclosure ratings, etc.
•
The adjustable frequency drive is protected against short-circuits on motor terminals U, V, W.
•
If a line phase is missing, the adjustable frequency drive trips or issues a warning (depending on the load).
•
Monitoring of the intermediate circuit voltage ensures that the adjustable frequency drive trips if the intermediate
circuit voltage is too low or too high.
•
The adjustable frequency drive constantly checks for critical levels of internal temperature, load current, high
voltage on the intermediate circuit and low motor speeds. As a response to a critical level, the adjustable
frequency drive can adjust the switching frequency and/or change the switching pattern in order to ensure the
performance of the adjustable frequency drive.
Digital Inputs
Programmable digital inputs
4 (6)
1)
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 ranges
0–110 kHz
(Duty cycle) Min. pulse width
4.5 ms
Input resistance, R
i
Approx. 4 kΩ
Safe Torque Off Terminal 37
3, 4)
(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.
1)
Terminals 27 and 29 can also be programmed as output.
2)
Except safe torque off input Terminal 37.
3)
For more information on terminal 37 and safe torque off, see chapter 3.12 Safe Stop.
4)
When using a contactor with a DC coil inside in combination with safe torque off, 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.
Selection
Design Guide
MG34S222
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
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Summary of Contents for VLT AutomationDrive FC 300
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