23
UG 6946 / 25.11.19 en / 188A
Preparation
•
Motor on standstill
•
Terminals L1-L2-L3 connected to the motor windings
•
Provide link on terminals X1-X2
•
Provide also link on X2-X3 on DC motors or DC braking
•
Adjust U
an
to minimum
•
Adjust t
s
to minimum (0.2 s)
Connect correct auxiliary voltage to terminals A1-A2
⇒
After 1 sec the LEDs „UH“ and „OUT“ light up green and the safety
contacts are switched on.
If standstill is not detected (LED „OUT“ lights yellow), possibly interfe-
rence is coupled on the measuring circuit. Adjust U
an
higher or screen the
measuring wires.
Start of motor
⇒
LED „OUT“ changes colour to yellow. The output relays switch off. On DC
motors the LED „ERR“ starts to flash after 2 s with flash code 2.
Stop of motor – run down DC braking off
The speed at which standstill is detected (yellow LED „OUT“ changes to
green/green flashing) can be adjusted on Potentiometer „U
an
“. When the
run down is slow or irregular the time delay must possibly be increased
to avoid switching on and off of the output relays. Possibly this effect can
also be avoided by slightly increasing Uan. During time delay ts the LED
„OUT“ flashes green.
If standstill detection shall only take place at very low speed of the motor,
U
an
is set normally to minimum. By increasing the delay time ts a possible
pulsing of the output relays can be avoided. A longer time delay will also
guarantee standstill detection only when the motor has already stopped
turning. (especially on motors that generate only a small remanence volta-
ge).
On slow decrease of motor speed it is possible that a simultaneity failure
occurs (see failure monitoring) when the measuring channels reach the
tripping values slowly and not within 2.5 sec. To avoid this failure a single
phase connection could be the solution (to make sure that both inputs get
the same signal) or the increase of the setting value U
an
.
If the run down time of the motor is short ts can be set to a minimum
(0.2 s). This is suitable in production systems to shorten machine cycles.
!
Attention
It is the responsibility of the user to adjust Uan and ts in a way
that standstill detection and enabling of the safety contacts in the
application is only possible when danger to men and material by
the rotating can be excluded.
Setup and Setting