Parameter Unit Range Default
Parameter 42-51 Speed Limit RPM 1–9999 RPM 150 RPM
Parameter 42-52 Fail Safe Reaction n/a Safe Torque Off/Safe Stop 1 Safe Torque Off
Parameter 42-53 Start Ramp n/a No/Yes No
Parameter 42-54 Ramp Down Time s 0.1–3600.0 s 1.0 s
If the speed exceeds the limit, parameter 42-52 Fail Safe Reaction is activated. The safety function can either be STO or SS1 Ramp Time.
SS1 can only be triggered as error response if 1 digital input is selected as SS1 with ramp time function, set in parameter 42-40 Type.
3.6 Inputs and Output
An internal diagnostic function in the safety option cyclically tests the correct function of the output. A detected fault sets the safety
option into an alarm status. At the same time, the option output S37 goes low.
Shorts between the 2 lines of a dual channel input are not detected. Therefore the cables of the channels must be routed separately to
exclude short circuits.
NOTICE
Shield all proximity switch sensor/encoder cables. Connect the shielding to the chassis at both ends.
3.6.1 Inputs
The Dual-pole digital inputs are used to activate the safety functions. DI 1 can be:
• STO: Safe Torque Off.
• SS1: Safe Stop 1.
• SLS: Safely limited speed.
Signals at DI1:
• 1/0 transition at the input: Activates the safety function.
• 0 signal (0 V) at the input: Activates the safety function.
• 1 signal (+24 V) at the input: Does not activate the safety function.
DI2 can be:
• STO: Safe Torque Off.
• SS1: Safe Stop 1.
• SLS: Safely Limited Speed.
• Reset: Extra safe input to reset the safety option after an error, or after deactivating a safety function on input DI1.
Signals at DI2:
• 1/0 transition at the input: Activates the safety function.
• 0 signal (0 V) at the input: Activates the safety function.
• 1 signal (+24 V) at the input: Does not activate the safety function.
• 0/1 transition at the DI2 input if configured to reset: Resets the safety option.
Functions and Systems Overview
Installation Guide | VLT® Safety Option MCB 150/151
AQ279747441421en-000101 / 130R0292 | 31
Danfoss A/S © 2018.09
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