KFU8-DW-1.D
Operation
129506 2012-12
23
The OFF delay causes the relay to operate immediately after the
upper limiting value is exceeded. Each time the measured parameter
falls below the lower limit, the timer is started and as soon as the timer
runs out the relay switches off (retriggerable).
defined ON time implies that the relay operates when the upper
hysteresis limit is exceeded and switches off again after the preset
time (not retriggerable) independently of further variations in rpm.
Pulse extension ensures that the relay operates when the upper limit
is exceeded and switches off again as soon as the preset time (not
retriggerable) elapses. see Figure 5.1 on page 26
Startup override
(factory preset: 1.5 s)
A startup override time between 0.1 s and 999.9 s can be
programmed in order to avoid false signals on the start-up of a drive
that is being monitored for underspeed. During this time the device
and the output relay behave as if the machine had already exceeded
the upper hysteresis limit.
The startup override time is started by a positive signal on terminal 2;
the positive signal must be at least as long as the override time. The
start signal can originate from a higher order control, or be generated
by the connection of the power supply to the rotational speed monitor.
In the latter case, terminals 2 and 3 have to be bridged.
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