Chapter 7 – Maintenance
TestEquity TEC1 Thermoelectric Temperature Chamber
Page 7-5
Troubleshooting
SYMPTOM
CONDITION
POSSIBLE CAUSES
Chamber does not
function.
If POWER switch is ON and TEMP
switch is ON. Controller is lit up. Fans are
not running and doesn’t heat or cool.
a)
DC power supply is configured
for 230 V but chamber plugged
into 115 V.
b)
Defective DC power supply.
c)
Shorted Thermoelectric Module
d)
Shorted fan.
Does not heat up at all.
If controller light 1 is ON, fans are
running.
a)
Defective output 1 on
Temperature Controller.
b)
Defective SSR3 or SSR4.
Heats up too slow.
If controller light 1 is ON, fans are
running.
a)
One Thermoelectric Module is
open.
b)
One of the fans is not running
(defective).
c)
Chamber interior is overloaded.
Does not cool at all.
If temperature controller light 2 is ON,
fans are running.
a)
Defective output 2 on
Temperature Controller.
b)
Defective SSR1 or SSR2.
Cools too slowly or does
not cool down to 10°C.
If temperature controller light 2 is ON,
fans are running.
a)
One Thermoelectric Module is
open.
b)
One of the fans is not running
(defective).
c)
Chamber interior is overloaded.
d)
Test sample is energized, giving
off excessive heat.
e)
Back of chamber is pushed up
against a wall.
f)
Room temperature is over 27°C.
Temperature has
excessive overshoot or
undershoot.
If tuning PID control parameters in
temperature controller were changed.
a)
Re-enter values as shipped from
TestEquity.
If tuning PID control parameters in
temperature controller are as shipped from
TestEquity.
a)
Control parameters may need to
be changed for your unique test
conditions.
b)
Try to Autotune at the
temperature where you are
observing the overshoot or
undershoot.