5
Selection of Step Limitation
This position limits the number of steps in circuit. e.g. if you have a CX12, twelve step controller, but only
have nine steps connected, adjust this setting to 9.
Do not set to more than the number of steps on the
relay as the defective step alarm will be triggered.
6
Automatic display of failed Capacitors
Indication of either failed capacitor steps or unengaged outputs. Indication "Cd 05"
(Capacitor Defect No.5)
alternating with
"Cd 09"
indicates, that steps 5 and 9 are failing. "Alarm" (AL_ _) will be shown in the
display. Once the fault on the failed steps has been rectified, the alarm signal is cleared by pressing
b and – for longer than 20 sec.
"Cd 0"
will show in the display to indicate the alarm is cancelled
and there are no defective capacitors. (see also (Pos. 9 below)
7 Counter for the number of times each capacitor step contactor has switched.
The number of switching operations for each contactor are shown in the display, e.g. "OC_ 4" for capacitor
step No.4 for 2 sec., then "248". This indicates, that contactor no. 4 has completed 248 switching operations.
Other contactors can be selected by using the +/- buttons. The micro-processor stores the data for
every 10 contactor switching operations. The stored data of all steps can be cancelled by depressing the +/-
buttons together for more than 20 sec. Automatic control is active all the time!
8 Indication of Step kvar
This is a very useful way of keeping a check on capacitor step kvar outputs over a period of time.
The value indicated on display is
a unit of value proportional
to the step size, but is not the actual kvar.
This display will show for example,
"CC 10"
for the 10th step, followed by 2 numbers e.g.
"L 74" and "F
84".
"F"
stands for the first sensed capacitor size during commissioning and "L" for the last measured value
after, let´s say several months or years. In this way a check can be kept on the change in kvar output of
each step, if any. If the selected defective threshold level in pos.
0
, is exceeded due to a failed capacitor or
blown fuses, the CX or CXM eliminates this step from the control procedure and alarm
"AL",
appears in
the display. The
"L"
and
"F"
values for each step can be scrolled through with + or – button, and this is a
good check to do on regular capacitor bank maintenance. The stored values can be re-set by pushing
b and – together for longer than 20 sec. The regulator will store each step from the moment of
re-set. Automatic mode remains active whilst these checks are made.
The CXM regulators fitted with multi-meter option
"M"
(Indication of energy data) displays the measured
capacitor sizes in real kvar provided the correct CT ratio factor has been inserted (see page 5)
9 Selecting and cancelling the alarm you require
Four alarm types are available and these are selected by scrolling through using the + - buttons, when the
function switch is in position 9.
"A__0"
All alarm indications cancelled. No alarm will appear in the display.
"A__1"
Alarms will be shown , but will cancel themselves once the position has rectified itself.
"A__2"
Any alarm recorded will remain in the display until the fault is rectified and the alarm is manually
cancelled by pr - together for at least 20 secs.
"A_3"
The alarm stored on the display is cancelled by pressing the + - buttons together for at least 5
secs.
This will re-set alarms for :
Low PF for at least 75 times step switching time, – display indication "AL_"
Over Temperature if "L" option is fitted – display indication "HA" (Heating Alarm)
If both alarms are operating – i.e. Low PF and High Temp, the display will show "AH"
Once the alarm is cancelled the display will show "ArES"( alarm reset)
NB: if the Defective capacitor Step alarm has operated - with "AL_" in the display, this can only be
cancelled by going to Pos.6 on the function switch and pr - together for at least 20 secs,.
A
Selection of a 2nd Power Factor Target, or an alarm
Some tariffs allow a lower power factor at certain times. For example at night in order to compensate for a
leading pf on the system caused by the Capacitance of buried cable networks in cities. This position of the
function switch allows you to select a second target PF, and this second target PF will be triggered by
applying voltage between 150-240V 50/60Hz on NT1/NT2 – see wiring diagram. If option "L" is fitted, the
lower PF will automatically come into operation if the ambient temperature rises above 57º C.
3
