CHECKLIST
; Never connect either of the thermoelectric cooler leads to ground! This results in excessive current to flow
causing possible damage to the cooler. Note: slightly overrated fuses have been installed in the Series
800/850 TEC Controllers that should protect the TEC against most faults. However, there is no guarantee.
See Chapter 3 for details on the fuse.
; Never put a direct short across the thermoelectric cooler leads when power is applied. This will cause
excessive currents to flow and could generate a significant spark.
; Always set the output Current Limit(s) of the Series 800/850 TEC Controllers to approximately 10% less than
that specified by the manufacturer of the thermoelectric cooler.
; Caution: If a thermoelectric cooler melts down due to excess current in all likelihood it will become a direct
short. Note: Current to the thermoelectric cooler can be adjusted by using the Current Limit settings:
[IL`A], [IL`b] and [ILSP]. See Chapter 5 under “Detailed Parameter Descriptions” for details.
INSTRUMENT FUSES
Series 800
The Series 800 TEC Controller is equipped with a 5 Ampere 250 Volt AC Line fuse
within the modular AC Input receptacle. If the Instrument does not power up when the
power switch is turned ON, or ceases operation while powered ON, place the power
switch in the OFF position and remove the modular AC Power Cord. Access the fuse
holder by prying the fuse holder open gently with a small screwdriver. Once the fuse
is removed, measure the continuity of the fuse with an ohmmeter. If the fuse is failed
(open), be sure to replace it only with a fuse of the same rating (5 Ampere 250 Volt,
Instrument rating). If the fuse continues to fail in operation, please contact the factory
about returning the unit for service.
The Series 800 TEC Controller is also equipped with a fuse mounted at the rear of the
analog controller PCB, providing protection for the TEC load. Since each Series 800
TEC Controller can be configured for different amounts of load current, this fuse will be
different for each configuration. If power is not being delivered to the TEC and this
fuse is suspected, place the power switch in the OFF position and remove the modular
AC Power Cord. Then remove the instrument cover, and access this fuse by rotating
the fuse cover 180 degrees with a small straight bladed screwdriver. Please be sure
to replace a failed fuse only with a value consistent with the load rating of the
instrument and the TEC you are using. Replace the instrument cover, and insert the
modular AC power cord into the receptacle. Check your instrument connections, and
turn the power ON. If this fuse continues to fail under load, insure that the
replacement fuse you insert is equal to or slightly greater than the rated load of the
instrument, and check the current limit programming of the instrument controller. If the
problem persists, please contact the factory.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 15
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