TCI HG7 - Manual (Page 41)

P O W E R M O N I T O R P A C K A G E O N L Y
POWER MONITOR OPTION HG7 I, O, & M Manual 39
HG2 Protection Monitor Calibration
Introduction
The HG2 has calibration adjustments, which can be used to calibrate the unit's filter current, line
voltage, and line current Operating Parameter displays. The HG2 should not be re-calibrated unless
re-calibration is indicated by the troubleshooting procedure or the installation of replacement parts
makes re-calibration necessary. The Calibration Mode is the same as the normal running mode except
that the HG2 does not trip in response to fault conditions.
HG2 Protection Monitor Calibration Procedure
Warning Only qualified electricians should carry out all electrical installation and
maintenance work on the HG7 Harmonic filter.
Personnel performing the calibration procedure must be capable of
safely working on powered equipment. To calibrate the HG2, it is
necessary to operate the drive and HG7 filter while measuring actual
operating currents and voltages inside the unit.
When in calibrate mode, the filter will not automatically disconnect upon
recognizing a fault condition. If a fault occurs during calibration, the
technician must be able to rapidly remove power from the filter to minimize
damaging components or blowing the filter fuses.
Required Equipment
♦ AC voltmeter and ammeter or multi-meter designed for true RMS measurements in a
harmonic rich circuit and suitable for the rated current and voltage marked on the
nameplate of the HG7 filter.
♦ Clamp-on current probe suitable for the rated current and voltage marked on the
nameplate of the HG7 filter.
♦ Clip-on voltage probes suitable for the rated voltage marked on the nameplate of the HG7
filter. Select probes that can be securely clipped on to the test points without shorting between
points or falling off.
Measuring Voltages and Currents
To locate the line current, filter current, and line voltage measurement points, refer to the schematic
diagram and outline and mounting dimension drawing for the specific unit that will be calibrated.
Some typical drawings are included at the end of this manual.
Warning The safest procedure is to attach and remove the voltage and current probes
only when power is disconnected from the equipment. Capacitors in the HG7
harmonic filter are equipped with bleeder resistors to automatically discharge
them to 50 volts or less within 1 minute after power is disconnected, but the
equipment should be considered to be "live" for at least 5 minutes.
Calibration Potentiometer Locations
The calibration potentiometers are located behind the right edge of the HG2 board as viewed from the
keypad side of the HG2. Refer to Figure 5 – HG2 Keypad View. When viewing the component side of
the HG2 board, the calibration potentiometers are on the left edge of the board. Refer to Figure 6 –
HG2 Board Component View.