Danfoss VLT AutomationDrive Design Manual page 87

FC 300 Selection
Maximum cross section to control terminals, flexible wire with cable end sleeves with collar
Minimum cross section to control terminals
1)
For power cables, see electrical data tables.
Protection and Features:
•
Electronic thermal motor protection against overload.
•
Temperature monitoring of the heatsink ensures that the frequency converter trips if the temperature reaches a
predefined level. An overload temperature cannot be reset until the temperature of the heatsink is below the
4 4
values stated in the tables on the following pages (Guideline - these temperatures may vary for different power
sizes, frame sizes, enclosure ratings etc.).
•
The frequency converter is protected against short-circuits on motor terminals U, V, W.
•
If a mains phase is missing, the frequency converter trips or issues a warning (depending on the load).
•
Monitoring of the intermediate circuit voltage ensures that the frequency converter trips if the intermediate circuit
voltage is too low or too high.
•
The frequency converter 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 frequency converter can adjust
the switching frequency and/ or change the switching pattern in order to ensure the performance of the
frequency converter.
Digital inputs:
Programmable digital inputs
Terminal number
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
(Duty cycle) Min. pulse width
Input resistance, R
Safe stop Terminal 37
Voltage level
Voltage level, logic'0' PNP
Voltage level, logic'1' PNP
Maximum voltage on input
Typical input current at 24V
Typical input current at 20V
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 3.8 Safe Stop of 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 50V 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
86
FC 300 Design Guide
2)
2)
i
3, 4) (Terminal 37 is fixed PNP logic):
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
2
0.5mm /20 AWG
2
0.25mm / 24AWG
1) 1)
FC 301: 4 (5) / FC 302: 4 (6)
18, 19, 27 1) , 29 1) , 32, 33,
PNP or NPN
0 - 24V DC
< 5V DC
> 10V DC
> 19V DC
< 14V DC
28V DC
0 - 110kHz
4.5ms
approx.4 kΩ
0 - 24V DC
< 4V DC
>20V DC
28V DC
50mA rms
60mA rms
400nF
2
53, 54
Voltage or current
Switch S201 and switch S202