Emerson MPR25 Troubleshooting, Systems equipped with NT5C10CO power shelf fault diagnosis

Appendix B: NT5C10CO shelf 111

The above settings will provide a delay of approximately 24 hours, which is sufficient to charge the batteries with a reserve of 80 to 120AH and at the same time supply power to a 10 A load. When the load is 6 A, or less on a battery reserve of less than 80AH, open SW1-4 and close SW1-3 for a delay of 12 hours.

Troubleshooting

The following are recommended steps for analyzing possible malfunctions of a system equipped with an NT5C10CO power shelf. This is in addition to the information contained in the “Troubleshooting” section of User Manual (UM) 167-9021-107.

Table 13 - Systems equipped with NT5C10CO power shelf fault diagnosis

Fault symptom	Possible causes
Delayed Start did not	•	No ACV at the power shelf input terminals.
activate (delayed start	•
LED is not lit):		Main rectifier has been removed or generates an RFA.
	•	Faulty circuit pack.
Incorrect time delay:	•	Verify that the SW1 switch is properly set.
	•	Faulty circuit pack.
		—end—

25A Switch Mode Rectifier NT5C06B / C Installation and User Manual