Motor Stop Waiting Time - Omron K7GE-MG User Manual

5-7

Motor Stop Waiting Time

Level Characters
Initial
mtwt
Setting
Set the wait time from trigger signal ON until the measurement
operation starts.
If the auxiliary contact of the contactor that turns ON/OFF the
power of the load is connected to the trigger input terminal, the
trigger signal for measurement start can be easily created.
However, since the auxiliary contact is linked to the contactor,
the trigger signal turns ON at the time when the contactor turns
OFF.
If the load is a motor, it does not stop immediately when it is
disconnected from the power, but stops gradually in due course
of time by slowing down. A line voltage is generated during the
time the motor is rotating, therefore, even if the trigger signal
turns ON, it is necessary to wait for the measurement to stop
completely.
The time until the stop of the motor varies depending on the
size of the motor and the inertia of the equipment being driven.
Therefore, first measure the time for the motor to be measured
to completely stop. Add some margin to that time to calculate
the setting value of the motor stop waiting time.
When measuring multiple channels, determine the setting
value from the motor that takes the longest time to come to a
complete stop.
The operation procedure for the Motor Stop Waiting Time setting parameter is shown as follows:
Procedure
1.
Press the Level Key for at least 3 seconds in the Operation
Level to move to the Initial Setting Level.
•
The LVL/CH display will indicate 0, and the LVL indicator will light
to show that the Initial Setting Level has been entered.
2.
Press the Mode Key several times to display mtwt.
Insulation Resistance Monitoring Device User's Manual (N224)
Range of Default
setting values value
0 to 299 (s) 10
5 Using Setting Parameters
Description
Wait time for the load to completely stop after
trigger signal ON
MC
Contactor
OFF
ON
Trigger signal
Motor speed
Measurement
3 seconds
Measurement
starts at auxiliary
MC-a
contact OFF
Measurement
start signal
L2
L3
PE
5
Complete stop
Motor stop
waiting time
CH1
TRIG FIN
LVL
mxch
0
MANU ERR AGE
TRIG FIN
LVL
mtwt
0
MANU ERR AGE
5 - 15