Peter electronic VersiSafe, Assembly And Commissioning Instructions

Page: 19 / 30

18 VersiSafe
If it is not possible to switch in the star contactor after the motor is switched off, the measuring
inputs of the VersiSafe have to be connected like a single phase connection. L2-L3 are bridged
and connected to one end of a motor winding and L1 to the other end of the same winding.
For reversing circuits and multi speed motors please follow the same procedure.
If in a 3-phase connection of VersiSafe windings are switched over, and the interruptions of the
measuring circuits are longer then 2 s, the standstill monitor detects broken wire. In order not to
store this failure, the unit should work with auto reset.
Operation with DE motors
The VersiSafe can be used on DC motors if these generate a remanence voltage during run
down.
The connection is made similar as with a single phase motor.
As the remanence voltage in this case is normally a DC voltage the unit will detect a broken wire /
offset failure and indicate it on LED „ERR“ and semiconductor output „ERR“. Taking this in mind
and operating the unit with auto reset for these failures the unit can be used for safety standstill
monitoring.
Operation with electronic motor controller
(inverters, DC-brakes)
The operation of VersiSafe to detect standstill on motors with electronic motor control is possible
if the control units do not generate any voltage n standstill. (NO position control on inverters, no
DC voltage on brakes after standstill).
If the inverter produces a DC offset or a DC brake is active, an offset or broken wire failure is
indicated on LED „ERR“ and semiconductor output „ERR“. This error resets automatically if on
terminals X2-X3 automatic reset is selected.
When there are inverters in the installation it is recommended to use screened measuring wires
to the motor. The screen can be connected to the motor.
Attention
If the motor current is run down by inverters or softstop modules in a slow
way the motor may be de-magnetised. It is necessary to check if the
remaining remanence voltage is sufficient to guarantee a correct and safe
standstill monitoring. At high frequencies an increasing damping of the
measuring inputs has to be taken into account (see technical data
Measuring input „response value dependant on frequency“).