| Error No. | Explanation | Corrective measures |
| 7507 | Motor-protective circuit-breaker of the fan has tripped | • Check function of the fans. • Clean the fans. • Clean dirty fan inlets and ventilation plates |
This fault occurs when the Stack Fan detects a problem with the incoming AC power. The fan will attempt to protect itself and generate this error. Power cycling the inverter for 5 minutes should resolve the issue. If not the heat sink fan will need to be replaced.
Heat Sink Fan Troubleshooting:
- Begin by trying to run the heat sink fan.
- You can simply pull a stack ribbon cable or jumper while control power is on and all fans should run at full speed.
- You could login to the SCCOM/Webbox and change TmpDrt parameters so that the fans run full speed.
- Listen to hear if it's running and feel for airflow at the back of the inverter.
- If the fan is running and airflow is low, be sure check the intake screens above and the air filter/screen underneath the inverter.
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| Potential airflow impedance below inverter | Potential airflow impedance above inverter |
4. If the over-voltage motor protection switch has activated, a power cycle should enable the fan to run.
5. If the fan still doesn't run, confirm all signals and voltage supply
a. Set the inverter so that it commands full speed (by removing a stack ribbon cable or jumper)
b. Check control signals are arriving at the correct points on the fan.
i. If not, trace back to the control board.
c. Check the voltage supply is arriving and within range for the fan.
i. If not, trace back to supply points.
d. If signals and supply are good, consider replacing the fan.
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| Stack ribbon cable connections | Heat sink fan signals and supply voltages |
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| Schematic for checking signals to/from the fan |
Replacing an EBM Pabst fan with a Rosenberg upgrade:
1. To begin, phase 1, 2, 3, and PE from the W614 cable should be landed appropriately.
2. Next, the W615 cable should have two wires. There is a very faint white label on the shielding which shows a number.
a. Number 1 should land in the COM port of the new fan.
b. Number 2 should land on the NC port of the new fan.
3. The W616 cable should have 5 wires. The same very faint white numbers are printed on each conductor.
a. Number 1 should land in the +10Vdc (6) port of the new fan.
b. Number 2 should land in the 0-10V/PWM (5) port of the new fan. Be sure this is landed in port (5) and not (8).
c. Number 3 should land in the GND (13) port of the new fan. Be sure this is landed in port (13) and not (4) or (7).
d. Number 4 should land in the GND (4) port of the new fan. Be sure this is landed in port (4) and not (13) or (7).
e. Number 5 should land in the OUT (12) port of the new fan.
f. Finally, a jumper should be added between +24V (10) and Enable (11) of the new fan.
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| Visual reference for making connections to the upgraded Rosenberg unit |