Toshiba VF010H05 - Manual (Page 86)

JKSSS+ Series - 80
JKSSS+ Series 2.3 - 4.2KV
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 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 annu-
ally 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 LCD will display the fault error and 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 CPU LCD Display LED
Aux
Relay
Possible Cause Solutions
Short circuit between the
inputs
Locate and remove short
Faulty SCRs
Remove power and test SCR(s). Refer to
Section 7.1.1 for the SCR testing
procedure
Short circuit or ground fault
in motor/cabling
Locate and remove short or ground
Phase Loss Repair cause of phase loss
Branch circuit protection
not correctly sized
Verify correct sizing of branch circuit
protection
Faulty main circuit board
Remove power and replace main circuit
board.
Faulty SCRs
Remove power and test SCR(s). Refer to
Section 7.1.1 for the SCR testing
procedure
Single phase incoming
power
Correct problem with incoming power
Faulty SCRs
Remove power and test SCR(s). Refer to
Section 7.1.1 for the SCR testing
procedure
Fan(s) not functioning
(If supplied)
If fans have power, remove power and
replace fan(s). If fans do not have power,
find cause of power loss and repair.
Heatsink coated with dirt
Remove power and clean heatsink with
high pressure air (80 - 100 psi max clean
and dry air)
Overcurrent on unit
Verify that running current does not
exceed unit rating
Environment temperature
over 122° F (ambient
temperature for chassis
units) or over 104°F
(ambient temperature for
enclosed version
Place unit in environment temperature
less than 122°F for panel version or less
than 104°F for enclosed version.
Bypass failed to close Check bypass contactor and wiring
AUX1
AUX1
Thermostat trips
during run
EXTERNAL TRIP ON
THERMOSTAT
Trip AUX1
Short Circuit Trip
SHORT CIRCUIT TRIP
Single Phase Trip
SINGLE PHASE TRIP
(Check LCD display for
possible fault indicators)
One of the main
fuses blows or
circuit breaker
opens when the
power is applied
or disconnect is
open
TCB FAULT TRIP Trip AUX1
Trip
Trip