Running on Machine Room Inspection
3-27
3
iControl DC
Verifying Quadrature Pulse Sequence and Encoder Resolution
Position Encoder Resolution
Verify that Position Encoder Resolution (Pattern Configuration/Common tab) is correct. When
the iLand landing system is mounted on the car top with the encoder wheel against the hoistway
rail, Position Encoder Resolution is 256 pulses/ft. Please refer to “iLand Landing System” on
page 3-2.
Quadrature Pulse Sequence
The quadrature pulse sequence must be verified before the hoistway can be learned.
1. Connect to the controller using iView.
2. Open the Hoistway screen. Display the Faults tab.
3. Move the car up the hoistway. Verify that Actual Position and Cartop Position increase.
4. Move the car down the hoistway. Verify that Actual Position and Cartop Position
decrease.
If the quadrature pulses are reversed, the Position Quadrature Reversed fault will appear in the
Faults display after the elevator moves about two feet. (The Actual position may decrease as the
car moves up and increase as the car moves down.) If indications are not correct:
• Check the DP1+/DP1- and DP2+/DP2- connections to the iBox and iLink (refer to the
job prints).
• If the connections are correct, use a multi-meter to test that the positive- and negative-
going pulses are arriving at the terminals. The streams should pulse between -15 and
+15 volts.
• If the signals are not arriving properly, check the cartop connection between the iLand
landing system and the iLink interconnect box. (Note that the Front Door/Front Mag-
nets cable must be present between the interconnect box and the landing system
regardless of your door/magnet configuration because it provides power to the landing
system.)
5. If iLand to iLink cabling is correct, first test the continuity of the cables, then check the
traveler connection between the iLink and the iBox for correct connections and continu-
ity.
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