Safe jog in combination with SLS
130BC959.10
4
2
3
6
1
5
fr
eq
ue
nc
y
time
A
B
A
Actual frequency
B
SLS limit
1
SLS is activated
2
42-51 Speed Limit
3
42-50 Cut Off Speed
4
Delta speed limit
5
Activation of failure function set in
42-52 Fail Safe Reaction
6
Fixed value of 120 RPM in
42-19 Zero Speed Limit
Illustration 3.12 Safe Jog
Access under specific conditions of reduced risk
Under specific conditions of reduced risk, safe jog allows
for access to areas for fault-finding, commissioning, etc. On
machines where safe jog (jogging or inching) is needed,
this is also possible from zero speed setpoint.
By activating Safely Limited Speed, the motor can be
moved at safe jog resulting in a number of cycles and with
safely monitored movements. The motor can be started
and stopped continuously also from zero speed.
3.5.5.2 SLS with Ramp
If this safety function is needed, configure the safety
option for Safely Limited Speed (SLS). When the inputs DI1
or DI2 are selected as SLS, input is OFF, feedback velocity
is monitored and compared against a configurable safe
speed limit.
Select
42-53 Start Ramp
to configure an SLS Monitoring
Ramp. The ramping begins when SLS monitoring is
requested by the selected input for SLS transition from ON
to OFF. The safety option starts monitoring for safe limited
speed when the ramp-down times out. If the system speed
exceeds or is equal to the configured safe speed limit
during Safely Limited Speed monitoring, a Safely Limited
Speed fault occurs and the safety option initiates the
configured Safe Stop type selected in
42-52 Fail Safe
Reaction
.
The ramping begins at the absolute value of the actual
speed. If the actual speed is already below the Safely
Limited Speed limit, the limit comes into effect
immediately without ramping. When the Safely Limited
Speed function is deactivated, the speed limits are ramped
up back to the values defined in parameter group
3-1*
References
, and the actual speed returns to the reference
value if it was limited by this function.
Follow these steps to configure the Safely Limited Speed
operation
1.
If a safe speed limit must be monitored, set one
of the 2 safe digital inputs, DI1 or DI2, to
[1] SLS-a
or
[2] SLS-b
in
42-20 Safe Function
.
2.
Select input type in
42-21 Type
.
3.
Select
42-53 Start Ramp
to run Safely Limited
Speed with monitored braking ramp. The default
value is
[0] No
for applications without SLS Ramp
control.
4.
Set the time allowed to reach Safe Limited Speed
in
42-54 Ramp Down Time
.
When the safety option actively monitors Safely Limited
Speed, and the motor speed is at or below the configured
safe speed limit, the function monitors the speed until the
function is deactivated.
5.
Set the value in
42-50 Cut Off Speed
.
Functions and System Overvi...
Operating Instructions
20
Danfoss A/S © Rev. 2014-02-11 All rights reserved.
MG34W302
3
3
Summary of Contents for VLT Safety Option MCB 150
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