APC 20 - 200 KVA user manual Measurement system, Voltage measurements, Current measurements

Control-panel display (cont.)

Measurement system

The display 23 may be used to read a number of input and output measurements made at different points in the system. See, in the Appendix, figure 23.

◗normal AC source 1

◗phase-to-phase voltages,

◗currents of the three phases,

◗frequency;

◗bypass AC source 2

◗phase-to-neutral voltage,

◗phase-to-phase voltages,

◗frequency,

◗currents of the three phases;

◗battery 3

◗voltage;

◗charge or discharge current;

◗remaining battery time (for the UPS unit concerned);

◗battery temperature;

◗inverter output 4

◗frequency;

◗total load 6

◗phase-to-neutral voltage,

◗phase-to-phase voltages,

◗currents of the three phases,

◗frequency,

◗active and apparent power.

Note:

Frequency converters without batteries are not concerned by the battery measurements. The displayed battery voltage corresponds to the DC voltage at the rectifier/charger output.

Bypass AC source 2 measurements are not displayed on frequency converters

1	3	4	6
U - I - F	U - I	F	U - V - I - F - P
A		B
Q1			Q5N
1
	QF1
2		D
U - V - I - F		C
Q4S
2

Fig. 23

Voltage measurements

These measurements may be accessed by pressing the "V" key 14 . The following data is displayed.

Note:

M1: normal AC source

M2: bypass AC source

Current measurements

These measurements may be accessed by pressing the "A" key 15 . The following data is displayed.

Note:

CF: crest factor

Power and frequency measurements

These measurements may be accessed by pressing the "W.HZ" key 16 . The following data is displayed.

Note:

PF: power factor

RMS	M1	M2	LOAD	RMS	M2	LOAD
U12	----	----	----	V1	----	----
U23	----	----	----	V2	----	----
U31	----	----	----	V3	----	----
RMS	M1	M2	LOAD	FC-LOAD I-LOAD/I-NOM
I1	----	----	----	-.--	----	%
I2	----	----	----	-.--	----	%
I3	----	----	----	-.--	----	%
LOAD	KW	KVA	PL/PN	= --- %	FREQ.HZ
P1	----	----			M1	--.-
P2	----	----			M2	--.-
P3	----	----	FP.LOAD = -.-		INV --.-

24 - E-51028230XT/BG