Table of Contents
Advertisement
VACON® 1000
Operating Guide
•
QS41 and QS42 are open.
•
KM41 and KM42 are open.
•
KM43 is closed.
The sequence in which the drive is switched from running to bypassed:
•
1. KM41 is opened.
•
2. KM42 is opened.
•
3. KM43 is closed.
Secondary Control Logic
The three switches KM41–KM43 use assistant contact interlock to ensure that the time course is followed.
•
KM41 does not open and KM42 does not act when the normally closed contactor of KM41 is connected into the opening circuit
of KM42.
•
The normally closed contactor of KM42 is connected to the MCB-closed circuit of KM43.
•
The normally closed contactor of KM43 is connected to the MCB-closed circuit of KM42.
•
KM43 is not able to close the MCB when KM42 is not opening.
•
KM42 is not able to close MCB when KM43 is not opening.
The status of the five switches KM41–KM43 and QS41–QS42 is monitored through the PLC.
•
If any switch is not at the right working position, the system does not allow the MCB to close, and powering up high voltage to
the system is forbidden.
•
If the drive goes into fault, the system breaks the switch automatically to cut off the HV input for safety, if KM41 is not able to
open during the process of VF switching to working frequency automatically.
The two switches KM42 and KM43 control the function of reserving postponed action in the circuit, which can adjust the action
interval of the switch during the process of VF switching to working frequency. It can be more convenient to calibrate the machine
on site according to the status of the electric motor and load, to switch speed reasonably to avoid an overcurrent malfunction be-
cause of the electric motor remanence.
26 | Danfoss A/S © 2021.06
Product Overview
AQ363633621020en-000201 / 172F3117
Advertisement
Table of Contents
