Siemens MCC-3298 user manual Troubleshooting

4 Troubleshooting

4Troubleshooting the SAMMS-LV Device

This section discusses how to troubleshoot the SAMMS-LV device. The troubleshooting guide below lists basic errors that can occur while operating the SAMMS-LV device. Use the guide as necessary to solve error conditions as they arise. Do not attempt to solve any error condition that is not listed in the troubleshooting guide. Instead, contact your Siemens repre- sentative.

Note: When contacting your Siemens representative, refer to the SAMMS-LV production control label to identify production date, hardware version, and software version. This label is mounted on the right side of the unit when viewed from the front. For example, 93-250-456-01/03 represents a device that was produced in 93, the 250th day of the year, unit number 456, hardware version 01, and software version 03.

	Troubleshooting Guide
Error Condition	Main Cause		Remedy
Current Unbalance	Current unbalance LED is illuminated if	1.	Correct the cause of voltage or load unbalance.
	current unbalance exceeds 40%, or it
	flashes if current unbalance is between	2.	Verify current transformer secondary voltage is
	20 and 40%. Current unbalance may		unbalanced at SAMMS-LV terminals 1, 2, and 3 with
	be due to voltage or load unbalance.		reference to 4.
Overload Trip	Indicates motor exceeded winding,	1.	Verify that the full load current F4 and service factor
	housing, or rotor temperature		F6 on the HHC matches the full load current and the
	threshold.		service factor on the motor nameplate.
		2.	If the motor tripped during start, increment the
			overload class one step and start again. If still
			unsuccessful, the motor’s rotor may be locked or
			stalled. Correct motor malfunction before restarting.
		3.	If the motor tripped after running for a period more
			than the overload class selected, the trip may be due
			to a running overload such as excessive loading on a
			conveyor belt or bad bearings. Remove the cause of
			the overload before restarting the motor.
		4.	F16 on HHC displays the most recent overload trip
			current value.

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