Figure 35. 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 ltering 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 xed 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 as active and be in emergency stop trip state. If this happens the wiring can be
changed connecting the power supply to VIN_P and VIN_N at same time or before the STOP
signals. The emergency state trip can also be cleared after every startup of the electric device.
CAN-network should be done using twisted pair shielded cable to minimize EMI for the CAN
signals. It is recommended to not use the shield of the CAN cable as the CAN ground, but to use a
separate ground wire.
EC-C1200-450
5. Installation
54 |
©
Danfoss | Produced By: Danfoss Power Solutions | January 2019
| BC265735231757en-000109
Summary of Contents for EC-C1200-450
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