CPI CMP 200 - 2.10.2 Initial Voltage Measurements

2 Installation CPI Canada Inc.
CAUTION: ENSURE THAT DIP SWITCH SW3-8 SETTING ON THE DUAL-SPEED STARTER
BOARD (903132-02) IS SET ACCORDING TO SECTION 2.8.3 OF THIS DOCUMENT,
WHICH SHOULD MATCH THE LINE VOLTAGE AND THE SETTING OF THE
AUXILIARY TRANSFORMER TAP SELECTED HERE.
2.10.1 Auxiliary Transformer Line Voltage Tap Selection (Cont)
4. Based on the nominal line voltage, set the transformer primary voltage tap as follows:
• Loosen the clamping screws for the current line-voltage tap, and for the required line-voltage
tap.
• Connect to the 400 V tap if the line voltage is nominally 400 VAC.
• Connect to the 480 V tap if the line voltage is nominally 480 VAC.
• Retighten both of the clamping screws.
2.10.2 Initial Voltage Measurements
1. If the mains supply is compatible with the generator, switch on the main breaker and / or the
disconnect switch and check for the following voltages:
NOTE: DO NOT SWITCH THE GENERATOR ON AT THIS TIME (ONLY THE AC MAINS TO
THE GENERATOR IS TO BE SWITCHED ON).
WARNING: USE EXTREME CARE IN MEASURING THESE VOLTAGES. ACCIDENTAL CONTACT
WITH MAINS VOLTAGES MAY CAUSE SERIOUS INJURY OR DEATH.
MAINS VOLTAGE WILL BE PRESENT INSIDE THE GENERATOR CABINET, EVEN
WITH THE CONSOLE SWITCHED OFF.
THE DC BUS CAPACITORS MAY PRESENT A SAFETY HAZARD FOR A MINIMUM
OF 5 MINUTES AFTER THE GENERATOR HAS BEEN SWITCHED OFF. CHECK
THAT THESE CAPACITORS ARE DISCHARGED BEFORE TOUCHING ANY PARTS
IN THE GENERATOR.
2. Measure and record the voltage across the main line fuses in the generator. Single-phase units
will only use one set of voltage measurements.
L1 phase to L2 phase: ______ VAC.
L1 phase to ground: ______ VAC.
L1 phase to L3 phase: ______ VAC. L2 phase to ground: ______ VAC.
L2 phase to L3 phase: ______ VAC. L3 phase to ground: ______ VAC.
3. Are the line-to-line and line-to-ground voltages within specification for the unit? For single phase
230 V units, the line to ground voltage should be 99 – 127 V. For 3 phase units, the phase to
ground voltage should be 114 – 146 V for 208 / 230 V units, 230 V ± 10 % for 400 V units, and
277 V ± 10 % for 480 V units.
___ Check
4. Confirm that the auxiliary transformer line voltage taps are set to the appropriate position as per
the measured line voltage.
___ Check
Use and disclosure is subject to the restrictions on the title page of this CPI document.
Page 2-30 CMP 200

X-Ray Generator Service Manual Ch # 901476-02 Rev. P