Toshiba CTX28 manual AC Power Ground Test, To perform the earth ground test procedure, Gmau

CTX28 Installation

AC Power and Grounding Requirements

AC Power Ground Test

Test the “wire ground” for continuity by either measuring the resistance between the TB3 terminal (earth ground) on the GMAU and a metal cold water pipe (maximum: 1 ohm), or by using a commercially available earth ground indicator. If neither procedure is possible, perform the following earth ground test procedure.

WARNING! Hazardous voltages that may cause death or injury are exposed during the following test. Use great care when working with AC power line voltage.

CTX28 Installation

To perform the earth ground test procedure

1.Obtain a suitable voltmeter, and set it for a possible reading of up to 250VAC.

2.Connect the meter probes between the two main AC voltage terminals (white and black wires) on the wall outlet. The reading obtained should be between 100~125VAC.

3.Move one of the meter probes to TB3 terminal (green wire ground). Either the same reading or a reading of zero volts should be obtained.

4.If the reading is zero volts, leave one probe on the ground terminal and move the other probe to the second voltage terminal.

CAUTION! If a reading of zero volts is obtained on both voltage terminals (white wire to TB3 wire, black wire to TB3 wire), the outlet is not properly grounded. Omit Steps 5 and 6, and see following CAUTION!

5.If a reading of zero volts on one terminal, and a reading of 100~125VAC on the other terminal is obtained, remove both probes from the outlet.

6.Set the meter to the “OHMS/Rx1” scale. Place one probe on the TB3 ground terminal, and the other probe on the terminal that produced a reading of zero volts. The reading should be less than one ohm.

CAUTION! If the reading is more than one ohm, then the outlet is not adequately grounded. If the above tests show the outlet AC voltage is not in range or is not properly grounded, the condition should be corrected (per Article 250 of the National Electrical Code) by a qualified electrician before the system is connected.

Table 1-2 Grounding Wiring Summary

Grounding Requirement	From	To	Description
System connects to earth ground	Earth ground	TB3 on GMAU
FG of HPFB-6 connect to GMAU	HPFB-6 FG Screw	TB1 on GMAU
			Less than 1 ohm
HPFB-6 Ground Feed	TB1 on GMAU	TB3 on GMAU
GETS connects green ground wire to	GETS ground wire	TB2 on GMAU
GMAU

Strata CTX I&M 06/04 1-5