Chapter 7 – Maintenance
Page 7-14
TestEquity 1016H & 1027H Temperature/Humidity Chamber
SYMPTOM
CONDITION
CAUSES
Temperature readout on F4
Controller varies more than
±0.5°C or 1°C total.
1.
If tuning PID control parameters
in F4T/F4 Controller were
changed.
2.
If tuning PID control parameters
in F4T/F4 Controller are as
shipped from TestEquity.
3.
If tuning PID control parameters
in F4T/F4 Controller are as
shipped from TestEquity and
only occurs in cool mode.
1.
Re-enter values as shipped from
TestEquity.
2.
Control parameters may need to
be changed for your unique test
conditions.
3.
Solenoid valve SV1 (or SV4 if
in Humidity mode) may be
defective.
Compressors turn on and off
too frequently.
1.
If compressor control
parameters in F4T/F4 Controller
were changed.
2.
If compressor control
parameters in F4T/F4 Controller
are as shipped from TestEquity.
1.
Re-enter values as shipped from
TestEquity.
2.
Solenoid valve SV1 (or SV4 if
in Humidity mode) may be
defective in the open position.
Excessive noise and
vibration when the
compressor starts.
1.
Chamber has been off for
several hours or more and is not
connected to source of power,
or main disconnect switch is off
during that time.
2.
Chamber has been off for
several hours or more, and is
connected to source of power
and main disconnect switch is
on during that time.
1.
The chamber must be connected
to the power source AND the
main disconnect switch must be
on for 3 hours prior to operating
the chamber.
2.
Crankcase heater defective
(open).
