Setting The Ramp-Down Monitoring Function; Setting Up Setpoint/Actual Value Monitoring - Siemens SIMOTRAS 6SG7050 Operating Instructions Manual

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7.6.17 Setting the ramp-down monitoring function

When the travel command is cancelled, SIMOTRAS HD will brake the drive electrically. The
SIMOTRAS HD cancels the "Release brake" signal when the speed drops to below a minimum
value (P370). A time stage is started at the beginning of the braking operation. If the time stage
elapses before the minimum speed has been reached, a fault message is activated (and the firing
pulses are disabled immediately and the "Release brake" signal cancelled)
• The time stage (U444) should be set to the value "parameterized ramp-down time + short safety
time (e.g. 10% of the ramp-down time)".
Travel command
(B0160)
Output of
ramp-function
generator
(K0190)
"Release brake"
signal
(B0250)
Fig. 7.6.17.1

7.6.18 Setting up setpoint/actual value monitoring

The setpoint/actual value monitoring system constantly checks whether or not the actual speed is
deviating from the setpoint speed (according to the ramp-function generator).
A time stage (P390) is started if the response threshold (P388) for the setpoint/actual value
monitoring system is exceeded. The time stage is reset if the speed value does not drop below the
response threshold again before the time stage elapses. Fault message F031 is activated when the
time stage elapses.
In the controlled range, the setpoint/actual value monitoring system is not active. When switching
back to the controlled range, a delay time (P387) will be running. The monitoring system will be
active again after the delay time has elapsed.
• The following settings affect the setpoint/actual value monitoring system:
P388 Response threshold
P390 Time taken for time stage to activate the fault message F031
P387 Delay time when changing back from open-loop to closed-loop range
7-20
U444 Monitoring time
Time characteristic of ramp-down monitoring
Brake contactor must drop out
within specified monitoring time
SIEMENS AG
SIMOTRAS HD
01.04
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t
t
6SG7000-0BA76
Operating Instructions