Chapter 7 - Troubleshooting Your Impulse
7-2
The keypad is blank, but the
backlight is on. You have an older keypad that re-
quires new firmware. The Impulse
requires a keypad with Version 3.00
firmware or higher.
Call IDC for a free firmware upgrade
to your keypad.
The keypad is blank and the
backlight is off. The keypad is not receiving a good
+5VDC signal. Check wiring, verify that the +5VDC
is between 4.8 and 5.2V.
It is difficult to read the display The contrast potentiometer needs
adjustment Adjust the contrast with the pot on
the back of the keypad.
Can’t Communicate over
RS232, but keypad works. If the keypad works, the Impulse
RS232 port is working. Something
else is configured wrong (i.e. wiring,
configuration, address).
Refer to Chapter 5, RS232 Trouble-
shooting, for help on this subject.
Can’t Communicate over
RS232, and keypad does
NOT work.
Impulse is configured as RS485. Check the label to make sure you
don’t have an RS485 version. Either
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
motor. Call IDC for assistance.
2 LED flashes
(Undervoltage Fault) Indicates that the high-voltage pow-
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.
Verify power supply voltage integrity.
3 LED flashes
(Overvoltage Fault) Bus voltage is too high. This is usu-
ally caused by a regeneration event
that overwhelms the internal power-
dump circuit. It can also be caused
by high line voltage or voltage
spikes.
Eliminate the regen event by reduc-
ing the load or make the move less
aggressively by reducing the com-
manded acceleration or velocity.
Check your AC line voltage to verify
it is within the Impulse’s limits.
4 LED flashes
(Over Current Fault) The motor is mis-wired or internally
shorted. The Impulse is protected
against such shorts, but you will
need to correct the problem to pre-
vent the fault.
With power off recheck connections.
Check Impulse current setting to
make sure you did not accidentally
damage a winding by using a higher
current than the motor is rate d 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
(Interlock Fault) Motor connector does not contain
an interlock jumper, motor has been
disconnected, or interlock jumper is
loose.
Ensure interlock jumper is securely
wired into motor connector. Ensure
motor connector is securely plugged
into the motor jack on the drive.