MCi iControl User Manual page 333

Table 6.3 iControl Messages
Position Quadrature Fault, POSITION QUAD FAULT
Description: The quadrature signal from iLand is not being detected (one or both streams). When moving
above 30 fpm, the system expects to see proper transitions on both quadrature signals.This fault may be
bypassed on the Diagnostics > Fault Bypass tab.
Car Reaction: Emergency stop.
Troubleshooting:
1. Verify that both quadrature channels are arriving at the iBox.
2. On the Hoistway screen, verify that the absolute position increments when moving up and decrements
when moving down (on inspection). If absolute position does not change, there may be a problem with
the iBox.
Position Quadrature Reversed Fault, POSITN QUAD RVRSD FLT
Description: The arrival sequence of the quadrature pulse streams indicates travel in the opposite direction
of that requested by the system.
Car Reaction: None.
Troubleshooting:
1. Verify that the elevator moves in the requested direction.
2. On the Hoistway screen, verify that the cartop position increments when moving up and decrements
when moving down (on inspection).
3. On the Hoistway screen, verify that the absolute position increments when moving up and decrements
when moving down (on inspection).
Position Speed Deviation Fault, POSITN SPEED DVTN FLT
Description: The safety processor compares the distance travelled reported by the position quadrature with
the distance travelled according to motor rotation. If the quadrature reports 48" travelled but the motor
reports less than 32" travelled, this fault is generated. This fault may be bypassed on the Diagnostics > Fault
Bypass tab.
Car Reaction: Emergency stop: Motor contactor and brake contactor immediately dropped.
Troubleshooting:
1. Check velocity feedback from drive.
2. Check that Pattern Configuration/General tab Position Encoder Resolution is set to 256.
3. Check calibration of speed feedback signal.
Position Speed Threshold Fault, POSTN SPD THRSHLD FLT
Description: The quadrature synthesized speed exceeds 115% of contract speed. This fault may be bypassed
on the Diagnostics > Fault Bypass tab.
Car Reaction: Emergency stop: Motor contactor and brake contactor immediately dropped.
Troubleshooting:
1. On the iView oscilloscope, compare Pattern Command and Speed Feedback to see that they match.
2. Use a hand-held tachometer to verify car speed.
3. Run the car on inspection and check the speed displayed on the iBox display.
4. For SCR drives, verify that the programmed running motor field is close to the actual motor field value
when running at contract speed. If the value is higher, the system will have to weaken the motor field as
the elevator reaches contract speed. If the motor field is very inductive, this may cause an overshoot. If
the value is too low, excessive current may flow through the armature. Note that load will affect this
value. Running in the up direction with a full load in the car will yield the worst-case scenario. For an
empty elevator, running in the down direction produces the worst-case scenario (the value will be higher
than for the fully loaded car.)
5. For highly inductive motor fields, begin motor field weakening earlier and end motor field weakening ear-
lier. If the begin weakening percentage is too low, poor control will result when the elevator is approach-
ing the destination floor (spotting). If this is the case, reduce the end weaken percentage without
modifying (by much) the begin weakening percentage. Generally, begin is recommended around 50%
while end is recommended around 90% for normal motor fields.
6. Reduce high roll jerk.
iControl Messages
iControl Messages
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