Impulse PCW-5181 user manual Troubleshooting Your Impulse

Chapter 7 - Troubleshooting Your Impulse

Symptom	Possible Causes	Possible Remedies
The keypad is blank, but the	You have an older keypad that re-	Call IDC for a free firmware upgrade
backlight is on.	quires new firmware. The Impulse	to your keypad.
	requires a keypad with Version 3.00
	firmware or higher.
The keypad is blank and the	The keypad is not receiving a good	Check wiring, verify that the +5VDC
backlight is off.	+5VDC signal.	is between 4.8 and 5.2V.
It is difficult to read the display	The contrast potentiometer needs	Adjust the contrast with the pot on
	adjustment	the back of the keypad.
Can’t Communicate over	If the keypad works, the Impulse	Refer to Chapter 5, RS232 Trouble-
RS232, but keypad works.	RS232 port is working. Something	shooting, for help on this subject.
	else is configured wrong (i.e. wiring,
	configuration, address).
Can’t Communicate over	Impulse is configured as RS485.	Check the label to make sure you
RS232, and keypad does		don’t have an RS485 version. Either
NOT work.		connect to RS485 or call IDC (or your
		distributor) to exchange units.
	The keypad is disabled.	Enable keypad through DIP switch
		on back of keypad and try again.
	The serial port is not working.	Call IDC (or your distributor) for ap-
		plication assistance.
Steady Red LED	Motor not probed.	If using Application Developer, use
		the Project Wizard or select Run >
		Probe Motor from the main menu. If
		using a keypad, select RUN >
		PROBE.
1 LED Flash (Stall)	Motor stalled.	Motor may not produce enough
		torque for the application.
	“Nuisance fault” - using a non-IDC	Call IDC for assistance.
	motor.
2 LED flashes	Indicates that the high-voltage pow-	Verify power supply voltage integrity.
(Undervoltage Fault)	er supply has fallen below 110 VDC
	for more than 3 seconds. This pre-
	vents the drive from trying to operate
	a motor with insufficient power to
	meet speed-torque performance ob-
	jectives.
3 LED flashes	Bus voltage is too high. This is usu-	Eliminate the regen event by reduc-
(Overvoltage Fault)	ally caused by a regeneration event	ing the load or make the move less
	that overwhelms the internal power-	aggressively by reducing the com-
	dump circuit. It can also be caused	manded acceleration or velocity.
	by high line voltage or voltage	Check your AC line voltage to verify
	spikes.	it is within the Impulse’s limits.
4 LED flashes	The motor is mis-wired or internally	With power off recheck connections.
(Over Current Fault)	shorted. The Impulse is protected	Check Impulse current setting to
	against such shorts, but you will	make sure you did not accidentally
	need to correct the problem to pre-	damage a winding by using a higher
	vent the fault.	current than the motor is rated for.
		Check to see the motor phases are
		not shorted to one another or to the
		case of the motor. The resistance in
		each phase should be about the
		same; only a few ohms. If the phas-
		es are open or have large resistanc-
		es, the motor is probably damaged
		and should be replaced.
5 LED flashes	Motor connector does not contain	Ensure interlock jumper is securely
(Interlock Fault)	an interlock jumper, motor has been	wired into motor connector. Ensure
	disconnected, or interlock jumper is	motor connector is securely plugged
	loose.	into the motor jack on the drive.

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