YORK YK — VSD Stop Contacts Open

The panel shows VSD Stop Contacts Open. The manual states that this fault appears on the panel display when 120 V AC is applied.

This is a VSD stop-contacts fault. The manual's troubleshooting path for it runs through the VSD logic board (fault LED near the J16 connector), the wiring between J4 on the 031-03958 board and J14 on the 031-02911 board, the 24 VDC power supply with its 120 V AC feed, the J1 connection on the 031-03958 board, and the cable between the two boards — the possible causes the manual lists all sit in this chain.

• The VSD logic board is indicating a fault (the fault LED near the J16 connector is lit).
• A wiring fault between J4 on the 031-03958 board and J14 on the 031-02911 board.
• The 24 VDC power supply output is outside 23-26 VDC, or the supply has failed.
• The 120 V AC feed to the power supply is missing — the HOT and NTRL wires are miswired or a fuse is open.
• J1 is not installed correctly, or polarity is reversed on the 031-03958 board.
• The cable between the boards is faulty.
• The 031-02911 board is in fault.
• The 031-03958 board has failed.

1. Check whether the fault LED near the J16 connector on the VSD logic board is lit.
2. If the LED is lit, the logic board is indicating a fault: go to form 160.78-M3 for the M1 motor application, to form 160.84-M3 for the M2 and M6 motor in YMC2 applications, or to form 160.00-M10 for YK applications with motors of up to 1100 HP (50 HZ) and 1300 HP (60 HZ).
3. If the LED is not lit, check all wiring between J4 on the 031-03958 board and J14 on the 031-02911 board and correct any problems found; if this does not correct the problem, continue.
4. Look at the LED on the 24 VDC power supply; it sits on the face of the supply, toward the inside of the drive.
5. If that LED is lit, measure the output voltage at the terminals marked + and -. A reading of 23-26 VDC means the 031-03958 board must be replaced. If the reading is outside that window, remove the J1 connector and measure again: 23-26 VDC points again to the 031-03958 board, while a reading outside 23-26 VDC means the power supply must be replaced.
6. If the supply LED is not lit, measure for 120 V AC at the power supply's input. If 120 V AC is present, replace the power supply. If it is absent, make sure the HOT wire runs to J2 pin 2 on the 031-03958 board and to the appropriate fuse (the fuse must not be open), and that NTRL is connected as the connection diagram shows.
7. Confirm that J1 is installed correctly on the 031-03958 board and measure DC between J1 pin 1 (red lead) and J1 pin 2 (black lead).
8. If 24 VDC is present but with negative polarity, check that the brown (POS) wire runs from the positive supply terminal to J1 pin 1 and the black (NEG) wire from the negative terminal to J1 pin 2; if the problem remains, replace the 031-03958 board.
9. If no 24 VDC is present, remove J1 and measure at the harness connector: 24 VDC there points to the 031-03958 board; without 24 VDC, correct the power-supply output wiring or replace the power supply.
10. Measure AC voltage from J4 pin 2 to ground on the 031-03958 board. If it is not 120 V AC, measure J14 pin 4 on the 031-02911 board: 120 V AC there means the cable (part number 571-09367-205) is corrected or replaced; no 120 V AC means the reason the 031-02911 board is in fault must be found.
11. If J4 pin 2 reads 120 V AC, measure from J4 pin 1 to ground: 120 V AC means the 031-03958 board is working properly; without it, the problem lies with the 24 VDC supply, the cable, or a failed 031-03958 board.
12. If the fault is still not solved, contact PTS.

• 120 V AC — the fault appears when 120 V AC is applied; the checks measure 120 V AC at the power-supply input, from J4 pin 2 to ground, and at J14 pin 4.
• 23-26 VDC — the acceptable output window of the 24 VDC power supply in the measurement steps.
• 24 VDC — the nominal DC level checked across J1 pin 1 and J1 pin 2, and at the harness connector with J1 removed.