Overspeed; Testing The Safety Gear - Intec MLC 8000 Operating Manual

INTEC GmbH
Lift controller MLC 8000
22/12/2016
Operating manual V2.0

6.1.4 Overspeed

6.1.4.1 Moving with overspeed
In order to really test the burst pipe protection (hydraulic lifts) or the safety gear it is
necessary to run the lift with overspeed.
By lifts with CANopen connection this test may be done fully automatic, because the lift
controller directly sets the moving speed by CAN bus. By this test the moving speed is set to
150% of the nominal speed.
For lifts without CANopen connection the moving speed must be increased manually, e.g. by
adjusting the hydraulic valve or by changing the nominal speed parameter inside the VVVF.
During this test the speed monitoring of the lift controller is deactivated (otherwise the lift
would do an emergency stop before the lift reaches the set speed.
When starting the menu item "Technical check"" -> „Speed limit" ->„Overspeed trip" the
actual floor is displayd in 1st line. In 2nd line the target floor must be entered. After pressing
ENTER the lift starts the trip to the selected floor. In 2nd line the actual lift state is displayed
now. In the 3rd line the actual speed is displayed while 4th line shows the maximum speed
reached (only lifts with digital positioning like AWG or encoder).
6.1.4.2 Testing the speed monitoring
The lift controller constantly monitors whether or not the rated speed of the lift is exceeded by
more than 20%.
The test can only be done in lifts with digital positioning (like AWG or encoder). An important
requirement for this test is, that the parameter "v Nominal" is set correctly (see "General
parameters" -> "v nominal"; automatically measured during teach-in).
The lift must be in normal operation. For testing ,the menu item "Technical check"" -> „Speed
limit" ->„Speed check" must be started.
In the display of the HSE the actual floor is displayed. In the 2nd line the current controller
state is displayed (normally "Standstill", "Moving" or "Arrival").
If the lift is in "Standstill" state, the controller sets a car call to any other floor. When starting
the trip to this floor the parameter "v nominal" is automatically set to 80% of its original value.
After exceeding the speed threshold an emergency stop is carried out and the new state
"Overspeed" is displayed.
Exiting the menu item with ESC, the parameter "v nominal" will be set back to the old value
and the error will be deleted.

6.1.5 Testing the safety gear

The automated testing of the safety gear is only possible if:
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