Kübler SMC1.3, Safety Manual

Page: 189 / 235

R60047.0002 - Index 2 EN – page 69 / 115
12.6 Underspeed (Switch Mode = 5)
With parameter setting “Switch Mode” = 5, the frequency is monitored for underspeed.
The function is always active and considers the direction of rotation. The switching
point for underspeed is always at Frequency = Presel (no matter if with or without
hysteresis). If hysteresis is used, only positive Presel. values are allowed.
Relevant Parameters Remark
„Switch Mode “
= 5
„Pulse Time “
statically = 0 or pulse duration in x seconds
„Hysteresis “
hysteresis
„Startup Mode“ type of start-up delay
„Startup Output“ output assignment for start-up delay
„Lock Output“ lock function
„Output Mode“ homogenous or inverse output configuration (affects the Safety Integrity Level
SIL/PL)
„Presel. . “
switching point
„Delay “
shutter release delay
„Input Mode “
configuration of the control inputs (affects the safety level SIL/PL)
„ IN Function“
function of the control input
„ IN Config“
switching behaviour (single-channel, two-channel, inverse, homogeneous,
dynamic, static)
Relevant input functions Remark
Clear lock function, e.g. parameter „IN1 Function“ = 1 … 6 Only when lock function is active
Switchover switching points, e.g. parameter „IN2
Function“ = 13
Only when switchover is active
Example:
With Presel = 1000.0 Hz and Hysteresis = 10 %, frequencies f < 1000 Hz are declared as
underspeed. The underspeed output will be cleared with frequencies f > 1100 Hz.