Danfoss EC-C1700B-420 User Manual page 58

User Guide
EC-C1700B-420
Installation
58 | © Danfoss | June 2023
A minimal wiring scheme is shown in the figure below. The main point is that the POWER_ON input is the
one that should be used to turn the electric device ON or OFF. In particular, shut-down by
disconnecting VIN_N or VIN_P may in some circumstances result in the corruption of the parameters of
the electric device or other data.
Example of the minimum connections
The switch (SW1) is used to turn the converter on and off. VIN_P and VIN_N are continuously connected
to the power supply. There is an internal pull-down in the POWER_ON input. Use appropriate fuse (F1) for
protection. See values and information for fuse selection from the product data sheets.
Disconnecting the power supply
Sufficient time should elapse between bringing the POWER_ON voltage down and bringing VIN_P down.
Use of the grounding pins
In addition to the aforementioned signals, there are various ground (GND) pins in the signal connector.
CAN and I/O features use separate GND pins. The difference between unisolated GND pins and VIN_N is
that VIN_N/VIN_P go through a common mode choke for the filtering of conducted
emissions. Connecting signal GND and VIN_N together effectively disables the common mode choke.
POWER_ON and STOP signals use device internal GND as their reference. If, externally, they are produced
with respect to VIN_N, a high level of common mode disturbance may throw POWER_ON and STOPs out
of their operating range and cause the converter to stop or reboot. This can be fixed by connecting
VIN_N and signal GND, but this comes at the cost of increased EMI. Finally, there is an enclosure ground
pin, which is connected to the enclosure (frame) of the converter and can be used to connect cable
shields.
General information
Connect VIN_P to the positive power supply and VIN_N to the negative power supply. POWER_ON and
STOP_1/STOP_2 are usually connected to positive power supply. If STOP signals are used connect the
emergency stop switch between the STOP and positive power supply.
STOP signal should go high at the same time or before the power supply is connected to VIN_P and
VIN_N. If STOP signals are connected after VIN_P and VIN_N the inverter will most likely register the STOP
BC454142332191en-000101