Otis DSD 412 Elevator System

Code 117 indicates serial communication did not start within 10 seconds after drive reset or power-up. Code 118 indicates a valid serial communication message was not received for more than 150 ms.

This fault indicates that the DSD 412 drive has supplied excessive motor current for a significant duration. This condition does not automatically shut down the drive but is signaled via the ALARM relay output K2.

This fault signifies that the measured motor field current has exceeded 125% of the rated current, as defined by parameter #50. This condition can lead to motor field damage.

The DSD 412 drive detects that the Loop Contactor auxiliary contact failed to pick up or drop out within the expected timeframe. This behavior is governed by the setting of parameter #102.

This fault indicates that the Drive and Field Enable control circuit at terminal TB1-9 remained active for five minutes without the drive commencing operation. This condition can lead to burnout of the motor field winding.

This fault occurs when a large current error is detected in the armature circuit and persists for half a second. This indicates a break in the armature current path.

The DSD 412 drive detects that the Safety Circuit, connected between terminals TB3-1 and TB3-6 on the power supply, unexpectedly opened while the drive was in run mode. The safety chain must be closed for at least 100ms before enabling the drive. This fault is disabled if the speed is below the low speed threshold defined by parameter #64.

This alarm indicates that the input AC line voltage has sagged more than 10% below the nominal line voltage, as configured by parameter #9. This is a warning and does not automatically shut down the DSD 412 drive, but it suggests that preventative action may be required to avoid future F904 Low Line shutdown faults.

This fault indicates that the Counter-Electromotive Force (CEMF) of the motor has exceeded 109% of the measured AC input voltage supplied to the DSD 412 drive. This is a warning and does not cause an automatic drive shutdown.

The Counter Electromotive Force (CEMF) of the motor exceeded 118% of the rated VAC input voltage to the drive. This fault causes a drive shutdown to prevent fuse blowing.

The PCU processor was unexpectedly reset.

This fault causes an automatic drive shutdown when speed errors exceed the threshold defined by Function #100 for a duration longer than specified by Function #99 (Speed Error Trip Time).

This fault is triggered when an accumulation of five counted faults occurs. Once this fault is active, manual intervention is required to reset the drive and continue operation.

The actual field current failed to track the field current command by more than F192 (Default = 0.05) for 5 seconds. This condition is a warning and is not a shutdown fault.

The PCU (U13, U14) Version or Revision software is incompatible with the DCU (U39, U40) installed in the drive.

The contactor did not close or opened unexpectedly, or the motor voltage exceeded 30% of rated motor voltage #7 during Self-Tune #997. This fault sets the Severe Fault flag and forces the DSD 412 current reference to zero, leading to a drive shutdown.

Current flow in excess of 300% of the rated armature current has been detected.

The Low Voltage Power Supply (A4) output has dropped below 60% of the rated voltage. This fault requires a CPU Reset and will shut down the drive.

The Phase Locked Loop has lost synchronization with the 3 Phase AC input power supply. This sets the Severe Fault flag and forces the current reference to zero, shutting down the drive. It is generally caused by AC input power problems and is often self-correcting, frequently occurring with an F904 fault.

The AC input power has dropped below 80% of the Nominal AC Line Voltage #9 for 3 consecutive cycles or lower than 50% for one cycle. This sets the Severe Fault flag and forces the DSD 412 current reference to zero, shutting down the drive.

The field current feedback has dropped below 80% of the expected current during specific operating conditions: Field Weakening Mode (Top speed, #49), Full Field Mode (Accel or Decel, #50), or Standing Field Mode (not running, #53). This fault will shut down the drive.

The update of the Dual Port RAM from the Drive Control Unit (DCU) is unreliable. This fault will shut down the drive and requires a DSD 412 power down before attempting corrective actions.

The thermistor is found to be open or shorted. This fault can also occur if the machine room ambient temperature is below 0°C (as the resistance detected is too high) or if an open thermostat is present on larger drives. This fault will not shut down the drive.

The calculated SCR junction temperature is above 125 degrees Centigrade. This is derived from the thermistor heat sink measurement combined with the heating effects of measured armature output current on the SCRs. This fault will not shut down the drive.

Repeated high peak to average motor armature current is detected. This condition may be caused by defective hardware, poor regulator tuning, or other oscillatory operation conditions.

One or more of the three AC line fuses is open. This condition is checked on power-up and can be confirmed upon request through the PCU F#998 PCU Diagnostics function, via measurements on the Armature Interface PCB, A2.

One of the SCR/Doubler packs has a short circuit between the SCRs. This condition is checked only upon request through the PCU #998 Diagnostics CDU function. The optional handheld PCDU can identify which specific SCR pair is faulty. This fault requires a DSD Power Down.

One of the SCRs does not conduct current as expected. This condition is checked only upon request through the PCU #998 Diagnostics CDU function. The optional handheld PCDU can identify which specific SCR pair is faulty. This fault requires a DSD Power Down.

One of the following parameters is not within the acceptable range of the chassis hardware: Rated Volts #7 or #9, or Rated Current #3 or #50. This fault requires a DSD power down.

The prohibit rotation bit was removed while the loop was picked-up. This fault can only occur when using the handheld PCDU, indicating an incorrect operational sequence.

The polarity of the Armature Voltage Feedback wires is reversed or the wires are missing. This fault shows up during the F998 PCU Diagnostics Test and can cause F909 faults or very poor drive/ride performance if not corrected. This fault requires a DSD power down.

This fault is declared if a number entered for the Rated Line Voltage, #9, is outside the acceptable range of 150 to 525VAC. If 0 is entered, the rated line voltage defaults to 230 or 460 VAC depending on the line voltage sensed. This fault requires a DSD power down.

This fault is declared if the Rated Armature Voltage, #7, value is outside the acceptable range of 150 to 700 VDC. This fault requires a DSD power down.

The drive's computer cannot identify the drive size. The bridge type is determined by a sense resistor on the Cube ID PCB (plugged into the A2 Armature Interface PCB), which identifies the ampere rating and current feedback scaling of the physical hardware. This fault occurs if the sense resistor value is not recognized. This fault requires a DSD power down.

This fault is declared if a number entered for Rated Armature Current, #3, is outside the acceptable range of 0.125 to 2.0 times the bridge current rating. The bridge current rating is determined by the bridge sense resistor on the Cube ID PCB, located on the Armature Interface PCB. This fault requires a DSD power down.

This fault is declared if a number entered for Rated Field Current #50 is outside the acceptable range of the Field Interface board, A3, current rating. This rating is determined by the field sense resistor selected by SW1 on the Field Interface PCB. This fault requires a DSD power down.

The field bridge rating is determined by reading a sense resistor on the Field Interface board selected by SW1. If the resistance value is not recognized, a Field Sense Fault is declared, indicating a hardware fault. This fault requires a DSD power down.

A problem exists with either hardware or software on the Drive Control PCB, which can lead to a PCU watchdog timeout.

This fault indicates that the motor field current failed to reach near its rated amperes within 6 seconds during testing. This condition may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998) routines.

This fault occurs when the measured armature voltage is greater than 10% of the rated volts (parameter #7) during an open circuit test. It may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).

This fault indicates that the Armature CEMF voltage exceeds 20% of its rated value during a test. This condition may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).

This fault indicates that the motor armature current failed to reach near the specified test amperes within 6 seconds. This may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).

The DSD 412 drive will not perform Self-Tune if the calculated load inductance is less than 170 micro-henries. This fault may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).

This fault indicates a mismatch in calibration between the bus voltage and armature voltage feedback circuits. It may occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).

This fault indicates that the E-Stop circuit was opened during a Self-Tune (Function #997) or Self-Diagnostic (Function #998) test, rendering the test data invalid.

This fault indicates that a low voltage read-back is detected from the motor armature circuit. This can occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998).

This fault indicates that a low voltage read-back is detected from the DC bus circuit. This can occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998). For drives larger than 300 amps DC, this involves discrete wires.

This fault indicates a problem with the field control hardware. It may only occur during the power-up sequence.

This fault occurs when the Field Analog-to-Digital (A/D) converter reading remains saturated for more than 15 seconds, indicating an issue with the field current feedback circuit.

This fault indicates that the DSD 412 drive has detected an open motor thermostat circuit, specifically between terminals A4TB3(2) and A4TB3(8). This condition does not automatically shut down the drive but is annunciated via the ALARM relay output K2.

The motor speed has exceeded the trip level set in parameter #12, as measured by the encoder. Parameter #12 defines a percentage of the motor speed value set in parameter #11.

The drive does not detect encoder velocity in proportion to the armature voltage indication of speed. Refer to Function explanations for parameters #14 and #15.

The digital encoder signals and motor voltage signals do not agree in their detected direction of rotation.

This fault is detected by the PCU Diagnostics function (Function #998) and indicates that one or more AC line fuses are open within the DSD 412 drive power conversion unit.

This fault is detected by the PCU Diagnostics function (Function #998) and indicates that one or more SCRs (Silicon Controlled Rectifiers) or doubler packs within the DSD 412 drive are shorted.

This fault is detected by the PCU Diagnostics function (Function #998) and indicates that one or more SCRs (Silicon Controlled Rectifiers) or doubler packs within the DSD 412 drive are open, meaning they are not conducting current as expected.

This fault is detected by the PCU Diagnostics function (Function #998) and indicates that the Armature Feedback wires are either reversed or not connected at all.