Carlo Gavazzi PQT-90 - Manual (Page 31)

PQT-90 Instruction manual
Technical features
Output specifications
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61
59
PQT-90 Instruction manual
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Useful info
53
The variables measured by the instrument are cor-
rect if the inputs have been connected according
to the right polarities (see figure below). Should the
connection not be conforming to the right polari-
ties, measuring and retransmission errors may occur, both
due to the wrong direction of the current flowing in the pri-
mary/secondary of the ammeter transformer being connect-
ed.
■
What is ASY
The ASY variable allows you to control the asymmetry of
the delta voltages (for systems without neutrals) and star
voltages (for systems with neutral). The variable is calculat-
ed as follows:
where the first formula is to be applied to delta systems,
while the minimum value calculated between the two is to
be used for the star systems.
■ Input specifications
Number of analogue inputs
Current: 1 (1-phase; system code: 3)
3 (3-phase; system code: 3)
Voltage: 1 (1-phase; system code: 3)
4 (3-phase; system code: 3)
Digital inputs
AQ1038 No. of inputs: 3 (voltage-free). Purpose: W
dmd measure-
ment synchronisation + var
dmd
and PF
dmd
. Interfacing with watt-
hour meters (+kWh, +kvarh). Tariff selection: energy. Contact
measuring current: <8mA/ 17.5 to 25VDC
AQ1042 No. of inputs: 3 + excitation output
Purpose: W
dmd measurement synchronisation + var dmd ,
PF
dmd
. Interfacing with watt-hour meters (-kWh, -kvarh) and/or
measurements of gas /water m 3 . Tariff selection: energy or GAS.
Excitation output: 16V<+Aux<24VDC Max 15mA.
Contact measuring current: 15mA.
Common characteristics: Input frequency: Max 20 Hz, duty
cycle 50%. Close contact resistance:
≤ 1k Ω . Open contact
resistance: ≥ 100k Ω . Insulation: 4000V
RMS
Max input number:
6 in the configuration: AQ1038+AQ1042 or 2*AQ1042
Accuracy (RS232, RS485) In: 5A, If.s.: 6A, Un: 240VL-N, Vf.s.: 300VL-N.
Current (@25°C ±5°C, R.H.
≤ 60%, A
L1
, A
L2
, A
L3
) ±0,5% RDG (0.2
to 1.2 In), ±5mA (0.02 to 0.2 In). Current (An) @ 40 to 100Hz ±1%
RDG (0.02 to 1.2 In). Voltage (@25°C ±5°C, R.H.
≤ 60%) range AV5:
±0.5% RDG (from 48 to 300 V
L-N
) ±1% RDG (from 84 to 519 V
L-
L
); range AV7: ±0.5% RDG (from 80 to 480 V
L-N
) ±1% RDG (from
139 to 830 V
L-L
) includes also: frequency, power supply and out-
put load influences. Frequency: ±0.1% RDG
(40 to 440 Hz).
Active power (@ 25°C ± 5°C, R.H.
≤ 60%):
±0.5% (RDG + FS) (PF 0.5 L/C, 0.1 to 1.2 In, range AV5) or
±1% RDG (PF 0.5 L/C, 0.1 to 1.2 In, range AV5)
Reactive power (@ 25°C ± 5°C, R.H.
≤ 60%):