KEB COMBIVERT F5, Reference Manual, Page: 290 / 349

Analog Signal Failure
The Analog Signal Failure event will occur when no speed command is given within a certain time
period at the beginning of a run with external pr
ofile pattern generation US04 Control Type = Analog
(2,3) modes, and Serial (4,5) modes
The timer is defined as:
t = 2.5 x (LT01 + LT03)
= 2.5 x (Brake Release Delay + Speed Start Delay)
Default = 2.5 x (0.05s + 0.70s) = 1.875s
Maximum: 20.0 seconds
While the inspection bit is active (field-bus control word or digital input) the zero-speed timer is ignored.
If the inspection bit is released after 20 seconds, the Analog Signal Failure or Serial Command Speed
fault will occur as a typical zero-speed timeout fault. If a speed command is detected during the LT03
Speed Start Delay, the timer will automatically expire at the phase of the profile where pretorque speed
control gains (LC05, 10) are active and the drive will switch to the acceleration phase (LC03, 08, 11).
Brake Switch Failure
When a digital (LI04-11) or serial (Fb21-27) input is programmed for Brake Release Confirmation (18),
the drive checks if the brake opens or closes within a set amount of time. The timers are defined as:
Starting:
t = LT01 + LT03 + 2.5
= Brake Release Delay + Speed Start Delay + 2.5s
Default = 0.05s + 0.70s + 2.5s = 3.25s
Stopping:
t = LT10 + LT12
= Brake Drop Delay + Current Hold Time
Default = 0.10s + 0.50s = 0.60s
Two inputs can be programmed for the brake switch. During stop, the switches should be closed and
open during run. If the brake switch is open during the Idle Mode, then the Brake Switch Failure event
will also occur. If during the run, the brake switch closes, the Brake Switch Failure event will not occur.
Diagnostics and Troubleshooting
290