Toshiba JKSSS Series Instruction Manual page 94

Basic Installation and Operation
Guide
Chapter 7 - Maintenance and Troubleshooting
The soft starter is designed to be a maintenance-free product; however, as with all electronic equipment, the unit
should be checked periodically for build-up of dirt, moisture or industrial contaminants. These can cause high voltage
arc-over, carbon tracking or prevent proper cooling of the SCR heat sinks. All bolts should be checked annually for proper
tightness using an accurate torque wrench. According to the manufacturer's manual, check the contactor for air gap
spacing of the vacuum bottles.
Note: If the unit is installed in a contaminated environment and forced air cooling is used, blower filters must be
checked and cleaned regularly to insure proper air flow and cooling of the enclosure.
7.1 Failure Analysis
When a fault occurs, the OLED will display the fault error while the listed LED and AUX Relay will be lit. Please clear
all faults before attempting to restart the unit.
Note: If the problem persists after the required programming changes have been made, and all corrective action has
been taken, please contact the factory for assistance.
Problem
External protection
TCB FAULT
relay tripped or
TRIP
TCB board failure.
SHORT
Short Circuit Trip
CIRCUIT TRIP
SINGLE
PHASE TRIP
Single Phase Trip
(Check OLED
display for
possible fault
indicators)
EXTERNAL
Thermostat trips
TRIP ON
during run
THERMOSTAT
TOSHIBA
CPU OLED
LED
Display
Trip
Trip
Trip
Trip
AUX
Possible Cause
Relay
Fault initiated by an
external relay (e.g.
AUX1
emergency bypass
protection relay)
Short circuit or ground
fault in motor/cabling
Phase Loss
Branch circuit protection
not correctly sized
AUX1
Faulty main circuit board
Faulty SCRs
Single phase incoming
power
AUX1
Faulty SCRs
Heatsink coated with
debris
Overcurrent on unit
AUX1
Environment temp. over
122°F (ambient for chassis
units) or over 104°F
(ambient for enclosed
version
Bypass failed to close
JKSSS Series Solid State Soft Starters
Correct trip cause and reset
external relay.
Locate and remove short or
ground.
Repair cause of phase loss.
Verify correct sizing of branch
circuit protection.
Remove power and replace
main circuit board.
Remove power and test
SCR(s). Refer to Section 7.1.1
for the SCR testing procedure.
Correct problem with incoming
power.
Remove power and test
SCR(s). Refer to Section 7.1.1
for the SCR testing procedure.
Remove power and clean
heatsink with high pressure air
(80 - 100 psi max clean and dry
air).
Verify that running current does
not
exceed unit rating.
Place unit in environment
temperature less than 122°F for
panel version or less than
104°F for enclosed version.
Check the bypass contactor
and wiring.
Solutions
Cont.
81