4-51
Safety Tests
iControl AC
4
Ascending Car Overspeed Test - Machine Brake
This test is to be use for installations where one or more machine brakes are used for (desig-
nated as) the emergency brake. This test verifies that the emergency brake (machine brake) will
stop an empty car that is over-speeding in the up direction. Please refer to “Typical Brake Test
Circuit: Machine Brake Emergency Brake” on page 4-49.
1. Move the empty car to the bottom of the hoistway.
2. To enable the brake test, place jumpers from terminal FB1 to FB1X and from FB2 to
FB2X (see Figure 4.6).
3. To test the emergency brake, remove the brake coil wires of the main brake from their
normal terminals, e.g., B1 & B2, and connect them to terminals BT1 & BT2. Note: If the
machine has a set of two or more brakes designated as the main brake, move the brake
coil wires for all brakes not being tested to terminals BT1 and BT2.
4. Check the mechanical governor nameplate for its tripping speed. Check the Contract
Overspeed setting (Controller > View > Setup > Safety > Configuration tab).
5. On the iView Safety Tests tab, select the Electrical Governor Test (View > Safety Tests >
Test Name parameter).
6. Enter a Speed sufficient to trigger the Contract Overspeed but not high enough to trip
the mechanical governor.
7. Calculate the percentage of Contract speed represented by the test Speed and set up the
AC drive for an overspeed test (see “Running a Test” on page 4-43).
8. Acquire Write privilege and then click the Select button.
9. Follow the on-screen instructions “ELECTRICAL GOVERNOR TEST SETUP” and “To
perform and Electrical Governor test-”.
10. Once the test is “Armed”, press and hold the BRAKE TEST BUTTON to lift the brake(s)
not being tested, and then place a car call distant enough to allow the car to reach the
necessary speed.
11. When the electrical governor is activated the machine emergency brake will be
deployed. Power is removed from the driving machine and brake. Release the BRAKE
TEST BUTTON once the car has fully stopped. Place the car on Inspection and press the
iBox “Fault Reset” button to reset the fault.
12. Return the brake coil wires connected to terminals BT1 and BT2 to their normal termi-
nals.
13. Repeat the test for the main brake(s), leaving the brake coil wires for the main brake
connected to their normal terminals and moving the brake coil wires for the brake(s)
designated as the emergency brake to terminals BT1 and BT2. Repeat steps 5 through 11.
14. When the tests have been completed, return all brake coil wires to their normal termi-
nals and remove the jumpers from terminal FB1 to FB1X and FB2 to FB2X.
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