3-2
Malfunctions Not Indicated by a Fault
Logic Control Malfunctions
Malfunction
Symptom
Solution
Drive Will Not Start.
External Start Command issued,
corresponding bit in Logic
Command does not change
states.
•
External wiring to the adapter or the PLC program is setting the wrong
bit. Look for other bits toggling in the Logic Command when initiating
the START command. The Discrete adapters digital inputs are
programmable to any of the 16 bit positions. Verify that the inputs are
properly linked to the desired bits of the logic command.
•
An incorrect configuration link may exist. Check the source parameter
from the adapter in the drive to determine if the correct bit is being set.
If it is, check that the source parameter is linked to the proper sink
parameter.
External Start Command issued,
proper bit is set in Logic
Command.
•
Check the READY status bit in parameter 100 “Logic Status” is set to
1. The drive will not start if the ready bit is set to 0. Any of the following
conditions will cause the READY bit to be set to 0: A fault, ECOAST
string open, any stop bit in any of the three logic commands is set or
Armature Voltage is greater than 10% of rated. If no ready bit and Stop
bit are set in Param 150 only, check Param 620. It must be set to zero
if TB3-3 is not used.
•
ECOAST string is open preventing the drive from starting. Check
ECOAST status parameter 101 Bit 1 when VP faults are selected
(parameter 630 = 1). Close ECOAST string prior to issuing the START
command.
•
A STOP bit is set in one of the three Logic Commands. Check
parameters 150, 151, and 152 bit 11 for a set condition. If the bit is set,
determine the cause, as the drive will not allow a START if any STOP
bit is set.
•
The Bulletin 1300 Programming Terminal has LOCAL control. Check
parameter 152 bit 8. If set, the Programming terminal has control,
release LOCAL control at the terminal.
•
The wrong Logic Command is selected. If bit 8 in parameter 152 is
clear and bit 8 is set in parameter 150, then parameter 150 issues the
logic commands. If bit 8 of parameters 152 and 150 are clear then
control reverts to the lowest priority logic command, parameter 151,
regardless of the status of bit 8 in parameter 151.
•
The drive is executing a CLEAR FAULT. If bit 14 in Logic Command is
set, the drive will execute a Clear Fault until the bit is cleared. A start
command will not be acknowledged when a CLEAR FAULT is active.
•
Contactor wiring is incorrect. If external circuitry is not required, verify
that a jumper is present between TB2-8 & 9 (Series A) or TB2-6 & 7
(Series B 3.6-110A). Parameter 622 Contactor Type may also be set
incorrectly, 1 = DC, 0 = AC.
Drive starts but stops
immediately.
•
An incorrect START type is selected in parameter 624 “Maintained
Start”. If parameter 624 = 1 the start command must be maintained. If
the START is removed, the drive will initiate a “Controlled Stop”. If
parameter 624 = 0, the Start command will be treated as a momentary
type input (rising edge triggered) and a STOP command is required to
stop the drive.
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