more than 140 volts, and power will not be applied to the IT-1210's outlets. If the unit has been
operating with an acceptable input voltage and then that voltage goes out of the acceptable range,
the IT-1210 will shut off power to the outlet and this LED will begin flashing.
NOTE. If the mains power is below 80 volts and has caused the IT- 1210 to remove power from its
outlets, the IT- 12 10 will not restore power to the outlets until the mains voltage is more than 90
volts. If the mains power is above 140 volts and has caused the IT- 12 10 to remove power from its
outlets, the /T- 12 10 will not restore power to the outlets until the mains voltage is less than 130
volts. The reason for this is to prevent the power oscillating on and off in marginal conditions.
LED Voltmeter: This three-color, 20-LED bar graph is an accurate, self-checking AC voltmeter that
continually measures the IT-1210's input voltage. The meter reads from 90 to 128 volts in two-volt
steps. The normal range voltages are indicated in green, moo with moderate and extremely high or
low voltages in yellow and red respectively (see chart on the previous page). The voltmeter provides
three special flashing patterns to indicate abnormal power conditions:
1. If only the single LED located beneath the number 90 on the voltmeter flashes, voltage at the IT-
1210 input is below 90 volts. Power to the IT-1210 outlets will remain on unless the incoming voltage
falls below 80.
2. If all of the LEDs on the voltmeter flash, voltage at the input is between 130 and 140 volts. Power
to the IT-1210's outlets will remain on unless the incoming voltage exceeds 140.
3. If none of the LEDs on the voltmeter are lit, and the Extreme Voltage LED indicator is flashing
continuously, then the IT-1210 has shut down power to its switched outlets due to input voltage
below 80 volts or above 140 volts. The IT-1210's voltmeter has a basic accuracy of plus or minus
two volts, and extreme cold or heat may cause an additional one volt of error. Please note that the
voltage reading is advisory only. The IT-1210 does not compensate for high or low line voltage. If
you frequently move your rack to different locations, derive power from generators, use long
extension cords, travel internationally, or are in an area prone to brownouts, you may benefit from
the use of one of Furman's AC Line Voltage Regulators.
NOTE: Because the voltmeter reads the input voltage BEFORE the circuit breaker on/off switch, its
LEDs stay on whenever the IT- 1210 is plugged in, even when the power switch UAW s off this
feature allows you to check voltage before powering up your equipment. The LEDs are designed for
continuous, ongoing use. They consume little power, just a few cents worth a month, like a clock.
Ground Fault Interrupter (GFCI): The GFCI on the IT-1210's front panel is a special kind of
circuit breaker that detects an imbalance in the current flowing in the two hot legs. The .missing"
current is presumed to be flowing through the ground conductor (the round pin on an AC outlet).
Ground current often indicates a dangerous partial or full short circuit. If an imbalance is detected,
the GFC1 trips and cuts off power not only to itself, but to all the IT-1210's outlets. If this occurs, the
button on the GFCI marked "R" (Reset) will pop out. To restore operation, correct the fault and push
the button in.
You may test the proper operation of the GFCI at any time by simulating a ground fault by pushing
the button marked "T" (Test). If the GFCI is working properly, this will cause the "R" button to pop out
and cut off power. You can restore operation after a test by pushing the "R" button in.
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