HeatSeal 625ES, Руководство по эксплуатации и обслуживанию

Страница: 9 / 16

9
Revised 2017
HOT ROD CIRCUIT BOARD TEST
ELECTRICAL REQUIREMENTS

The Model 625-ES requires 115 volts, 19 amps.
(20A breaker, GFCI protected circuit)
HOT ROD CIRCUIT BOARD EXAMPLE
HOT ROD CIRCUIT BOARD TEST

A standard 115 volt neon circuit tester can be used for these tests.
CHECKING 1 AMP FUSES

Remove the fuses from their housing units located on the front of the electrical box. If a visual inspection does not verify a
blown fuse check for continuity by using the meter to read across the two terminals of the fuse.

If the meter reading does not show continuity, replace the fuse.
CHECKING THE HOT ROD

With the power turned OFF, remove the hot rod red wires from Terminals 1 and 2. Using the meter, measure the resistance
of the rod by connecting the leads of the meter to the red wires.

The meter should read between 130-136 ohms. If the reading is out of this range, replace the hot rod.
CHECKING THE THERMISTOR OF THE HOT ROD

With the power turned OFF, remove the hot rod black wires from Terminals 5 and 6. Using the meter, measure the re-
sistance of the thermistor by connecting the leads of the meter to the black wires.

The resistance of the thermistor is heavily dependent on the temperature (higher temperature, lower resistance). At a room
temperature of 70˚ F, the reading should be in the range of 260-270 kΩ, 90˚ F yields about 230 kΩ, and 40˚ F yields about
340 kΩ.

If the reading at a given temperature is off by more than 50 kΩ or if an infinite resistance is recorded (an open circuit) the
thermistor is bad and the rod needs to be replaced.
CHECKING THE HOT ROD CIRCUIT BOARD

After the hot rod and both the fuses have passed the above testing procedures, the circuit board can be tested.

With all the wires shown in the example circuit board (above) properly connected and the power ON, use the meter to test
the voltage across Terminals 1 and 2. If there is no voltage being read, the board needs to be replaced.
For board location in machine see page 13, #2