Allen Bradley IntelliVAC 1503VC Series E Control Module

If external capacitors are connected or multiple IntelliVAC share a control fuse, the recommended maximum fuse value should be selected to prevent the fuse from melting due to surge currents.

Coordination between DIP configuration and release time

Series E has 16 DIP switches, divided into two groups, SW1 and SW2, located at the front edge of the circuit board, with position 1 near the circuit board part number label. Changing DIP must be powered off, and the new settings will only take effect after being powered on again. The factory default is usually: altitude 0-1000 m, release time 130 ms, 400 A electrical hold, no TDUV, external capacitor TDUV 0.2 s, Power Up Safety enabled.

DIP is used to set altitude, release time, contactor configuration (400 A/800 A, electrical hold/mechanical lock), TDUV enable, external capacitor TDUV time, power on safety, etc. When the altitude exceeds 1000 meters, the rating should be reduced according to the table. In principle, for every 1000 meters increase, the rating should be reduced by about 2 ° C. The 400 A contactor can be electronically compensated for altitude through DIP, and the 800 A contactor can adapt to altitude through mechanical return springs. The release time should be coordinated with the upstream fuse, and a value equal to or greater than the intersection point of the rated breaking current of the contactor and the melting curve of the fuse should be selected. If the fuse is not the recommended model, the release time may need to be recalculated. The bypass contactor is usually set to release 50 ms in medium voltage soft start applications.

LED status and fault codes

The green module status light indicates that the power supply is normal and the configuration is valid; Red indicates a fault; Yellow or flashing yellow indicates a warning or specific status in different series. The status light of the contactor is yellow, which lights up upon receiving the CLOSE command and remains on until the contactor opens; When the contactor is not closed or the power supply is insufficient, it will turn off. The flashing codes of Series C, D, and E are different, and the color and flashing frequency should be recorded during troubleshooting.

In Series C, if the module status red light flashes 1, it indicates that the power on configuration is invalid; A flashing red light of 2 indicates that the contactor has been closed (electrically held) when powered on; Green light but contactor status red light flashing 1 indicates that the contactor has not been engaged; Green light but red light flashing 2 indicates that the contactor has fallen during the holding process; Green light but red light flashing 3 indicates that the contactor has been released for too long; The module status red light and contactor status red light indicate a microcontroller fault; The module status red light and contactor status off indicate undervoltage and the presence of the CLOSE command.

In Series D/E, the distinction between warnings and faults is more detailed: a module status with a constant yellow light may indicate the presence of invalid commands; Yellow plus one red flashing (Yellow-R1) indicates that the contactor failed to engage; Yellow-R2 stands for keep falling; Yellow-R3 indicates that the release time is too long; Red flashing 2 indicates that the contactor has been closed when powered on; Red flashing 1 indicates invalid DIP configuration; Red flashing 3 indicates that the contactor cannot be released (clearly a fault in Series E); The microcontroller malfunction is red. The warning will be cleared after the input status changes and the condition disappears; Faults usually require a power outage and restart.

Common fault handling

The contactor does not engage at all. First, check if both status lights are off: if they are off, check if the control power supply, internal fuse, power plug are securely plugged in, and if the control circuit is disconnected. Module status red light: It may be due to invalid configuration, undervoltage, or module failure. First, check whether the DIP contactor configuration is consistent with the actual product, and then power off and restart; If it still turns red, replace the module. If the module is green but the contactor is not engaged, check if the CLOSE command has reached terminal 9/10, if the auxiliary contacts are connected incorrectly, and if the contactor coil and harness are open.

The contactor instantly closes and no longer overlaps. The common reasons are coil damage or loose wiring, improper adjustment of auxiliary contact components, control voltage falling below the release point when there is no TDUV, and foreign objects between the armature and the iron core surface. First measure the instantaneous voltage of the suction, and then check the auxiliary contact settings and coil resistance; After a module failure, it is usually necessary to power off and restart for a reset. If the CLOSE command is revoked within 500 ms, it will also trigger a fault, and the command should be kept long enough during operation.

The contactor is open during operation. Check if the motor protection is activated, if the STOP command is mistakenly sent, if the control power supply is under voltage, and if the TDUV delay is shorter than the actual power loss time. If the red light of the contactor status flashes 2 (Series C) or Yellow-R2 (Series D/E), it indicates that the auxiliary feedback of terminals 11/12 has been closed, and the module considers that the contactor has been opened and releases the coil. It should be checked whether the auxiliary contacts are misoperated or the wiring is loose.