DCS 500 manual Arm. curent ripple

Chapter 4 - Signals and Troubleshooting

Code		Text on		Definition /		Status			Remark
seven		LCD of control panel		Action		signal
segm.
		CDP 31x				(FAULT_WORD_1/2)
display
F 34	Arm. curent ripple		Armature current ripple		11102		bit 0	(3)
			One or several thyristors carry no current.
			Check: - Current feedback with oscilloscope						modified
				(6 pulses within one cycle visible?)
									in
				- Branch fuses, thyristor gate con
									S21.232
				nection; gate-cathode resistance.
				- Sensitivity of monitoring function:
				set CUR_RIPPLE_LIM [421] (de
				pending on methode; see A 137)
F 35	Field ex.2 overcurr		FIELD EXCITER 2 (field supply 2) overcurrent		11102		bit 1	(1)
			{See Fault Code F 32}
F 36	Field ex.2 comerror		FIELD EXCITER 2 communication error		11102		bit 2	(1)
			{See Fault Code F 33}
F 37		Motor overspeed	Motor overspeed		11102		bit 15	(3)
			Speed feedback higher than parameter
			[P 2204].
			Check: - Scaling of speed controller loop;
				- Drive speed;
				- Field refererence values;
				- Speed feedback and connection
				of speed feedback;
				- Was the motor accelerated by
				the load?
F 38		Phase sequence	Phase sequence fault of power section		11102		bit 3	(3)
		fault	Change supply phase sequency or make
			correction with parameter [P 506].
			Attention: Direction of rotation of 3-phase
				fan correct?
F 39	No field ack.		No field acknowledge from FIELD EXCITER		11102		bit 4	(1)
			This message is either caused by the field exciter´s
			missing „ready for operation“ signal (1) or the field
			current being lower than the threshold (2). Reasons
			for (1):
			-	field supply not in synchronism, or
			-	electronic power supply for the field unit not within
			-	permissible limits
				power supply for the field unit not within permissi-
				ble limits
			Reasons for (2):
			-	field supply unit is broken
			-	field reversal took too long time
			-	field current lower than threshold because

IV A 4 - 8 DCS 500B / DCP 500B Operating Instructions

3ADW000055R0401_DCS500B_Operating Instruction_e_d