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POWER FACTOR REGULATOR

Computer-8d -96
Computer-8d -144

INSTRUCTION MANUAL
( M 981 601 / 98C )
(c)

CIRCUTOR S.A.

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-------- POWER FACTOR REGULATOR COMPUTER- 8 d ---------

POWER FACTOR REGULATOR COMPUTER- 8 d
1.- POWER FACTOR REGULATORS COMPUTER-8d-96 & COMPUTER-8d-144
Power factor regulator Computer-8d series permit the visualization on a digital display of powersystem cos ϕ, and the automatic connection and disconnection of capacitors in function of this
cos ϕ.
Built with a microprocessor and based on the FCP system (FAST Computerized Program), the
power factor regulator becomes an intelligent instrument, able to accurately inform about the
power system status, and to take complex decisions that most times require a high quantity of
calculations. Thisseries compiles the CIRCUTOR’s large experience with power factor regulators,
so improving their previous features by the application of latest technology.
Main features:
- True r.m.s. measurements: The regulator measure the reactive power in the facility, and will
connect or disconnect available capacitors according to setup data.
- Regulator from 3 to 8 output relays, with the possibilityof an additional alarm relay.
- Led Display with THREE seven segment digits.
- 4 quadrant, three-phase regulator (single-phase mode user-selectable through internal jumper)
- Setting actions from a frontal keyboard (4 keys).
- Alarms for current harmonic distortion and for improper power factor correction.
- Two sizes as per DIN 43 700 :

l
l

COMPUTER-8d-144 :
COMPUTER-8d-96 :

144 x144 mm
96 x 96 mm

1.2.- Connection instructions
The manual you hold in your hands contains information and warnings about the Computer 8d
that the user should respect in order to guarantee a proper operation of all the instrument
functions and keep its safety conditions.

-------- POWER FACTOR REGULATOR COMPUTER- 8 d --------2.- GENERAL DESCRIPTION
2.1.- VISUALIZATION OF PARAMETERS :The regulator provides following indications from a frontal panel:

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-------- POWER FACTOR REGULATOR COMPUTER- 8 d ---------

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Computer-8d display :
Parameters visualized on this display are:

- cos ϕ : x.xx
- Current measurement ( in A or
in A x 10 )
- Current distortion factor ( d % )
Parameter on display can be switched just pressing the key
parameter shown ondisplay.

. 4 leds on the right indicate the

When the last parameter is reached, whether this key is pressed again, the "SCAN" mode is
accessed, which provides an automatic and sequential visualization of all parameters (3 s
cadence). Pressing it again, the regulator turns back to "normal" mode.
ALARM messages are also displayed (see pertinent section).
Note : The regulator works at fourquadrant measuring mode. That way, whether a negative
sign is shown at the first digits of the display, it means that the power system is a generator
one. Check connection of phases and setup whether the indication is not correct. ( SET-UP phase ) .

cos ϕ > 0 - system consuming energy
ex.: 0.96 L inductive ( + kW & kvarL )
cos ϕ > 0 - system consuming energy
ex.: 0.95 C capacitive ( + kW &kvarC )
cos ϕ < 0 - system generating energy
ex.: - .85 L inductive ( - kW & kvarL )
cos ϕ < 0 - system generating energy
ex.: - .95 C capacitive ( - kW & kvarC )

-------- POWER FACTOR REGULATOR COMPUTER- 8 d ---------

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2.2.- KEYBOARD
The regulator is equipped with following keys on its frontal panel:

Diverse functions are assigned to each key according to the operation mode.- Pressing the key (SET ) the regulator configuration can be visualized, but this
cannot be modified (see setup procedure section). Led "SET" is on.

F The key permits to access diverse configuration sections.
F Press the key (SET ) again to exit. (whether no key is press for more than 3
minutes, setup visualization is automatically exited).
Note: during this visualization mode, the...
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