Kraft Power CCKSD-QD, Operation And Maintenance Manual, Page: 28 / 33

SAFETY DEVICES
OPERATION
26
OVERLOAD CONTROLLER
When load torque increases, slip also increases and output
speed consequently decreases.
The said speed variation can be measured by means of a sensor
sending a pulse train to the speed controller. If the rotating speed
goes lower than the set threshold (see diagram) on the controller,
a signal is given through the activation of the controller’s relays.
The device has got a “TC” timer with a blind time before starting
(1 - 120 s) avoiding the alarm intervention during the starting
phase, and another “T” timer (1 – 30 s) preventing from
undesired relay intervention during sudden changes of torque.
The device also provides a speed proportional analogic output
signal (0 – 10 V), to be forwarded to a display or a signal
transducer (4 – 20 mA).
Standard supply is 230 V ac, other supplies are available upon
request: 115 V ac, 24 V ac or 24 V dc, to be specified with the
order.
CONTROLLER PANEL (Fig. 8)
TC Blind time for starting
Set screw regulation up to 120 s.
DS Speed range regulation
Programmable DIP-SWITCH (5 positions), selecting relay status,
proximity type, reset system, acceleration or deceleration.
Programming speed Dip-Switch with 8 positions allows to choose
the most suitable speed range, according to the application being
performed.
SV Speed level (set point)
Set screw regulation with digits from 0 to 10. The value 10
corresponds to full range set with Dip-Switch.
R Reset
Local manual reset is possible through R button, or remote reset
by connecting a N.O. contact at pins 2-13.
SS Threshold overtaking
(RED LED) It lights up every time that the set threshold (set point)
is overtaken.
A Alarm led
(RED LED) It lights up when alarm is ON and the inner relay is clo-
sed.
E Enable
(YELLOW LED) It lights up when the device is enabled.
T Delay time
Set screw regulation up to 30 s.
ON Supply
(GREEN LED) It shows that the device is electrically supplied.
FOR FURTHER DETAILS, ASK FOR TF 5800-B.
RPM
1490
RPM
1490
Diagram
Fig. 8
Fig. 7
SPEED
ST
AR
T-UP
O
VERLO
A
D
OPERA
TION
LED TIME
RELAY