TENNEY ENVIRONMENTAL
-
LINE VOLTAGE
I
One of the most common causes of chamber malfunction is low line voltage as the power
source to the chamber. Ordinarily in this condition, the compressor motors would operate
erratically, eventually overheat and shut down. You must be certain that your equipment is
connected to a circuit with an adequate voltage and current source. An oversupply voltage
would also cause erratic operation and eventual shutdown or damage to your equipment.
The Tenney Series test chambers are designed to operate with a nominal
230VAC, 60
Hz
power supply. Optional equipment is available to allow operation with 208 or460VAC, 60
Hz
supplies or, for foreign use, operation with 200, 220, 380 or415VAC. 50
Hz
power supplies.
The allowable minimum and maximum voltages at each of these nominal voltages is tabulated
below:
Nominal Voltaae Minimum Voltaae Maximum Voltaae
60
Hz
Power Supplies
198 21 8
207 253
414 506
50
Hz
Power Supplies
180 220
198 242
342
418
374 456
Operation outside these limits can result
in
damage to the system's motors.
OPERATING WITH-AN
ACTIVE
HEAT LOAD
When operating with an active heat load, such as introduced by a powered test unit, this heat
must be removed or the chamber temperature will rise. The internal logic of the controller will
automatically turn on the refrigeration system to maintain a set temperature. Although a
cooling system failure is not likely to occur, it is always a possibility when mechanical systems
are used. In the event of a cooling system failure that results
in
an out of limit over temperature
condition, one or more of the system safeties will remove power from the system. However,
heating
will
continue if power remains applied to the active load. To guard against this
continued heating, the product should be powered through the spare contact of the master
contactor (ICON) which is described in the Alarm And Shutdown Circuit section.
PAGE
9
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