▼
CPI – or Target Power factor setting
Set to the required target PF. Note if you press
▲
when the CPI is 1 you will go into a leading pf setting. You
can target up to 0,70 lead., which is an unlikely setting but when the PFC is on the LV side of a transformer
and the customer is paying for energy on the HV side it may be useful to target to about 0.99 lead so as to
compensate for transformer reactive current which is creating I²R losses in the windings on no load.
▼
St – Switching time per step
Adjustable from 1 second – 999 seconds. For longer times there is also the possibility to have 'k' ( x 1000 )
and 'M' x 1 Million if needed. If the switch time is set to 1 second per step, for a rapidly changing load, of
course it cannot switch back in again after a delay of only 2 seconds, due to the charge held on the
capacitor. In this case the relay will wait until the programmed discharge time set in menu 401. Default
setting on menu 401 is 75 secs.
▼
OUt – Setting of Output for each Step
This setting allows you to select each step setting either as:
Auto
– normal automatic relay controlled step switching
AL
– This step operates an alarm contact. When the temperature is above the target setting – this contact
can be used to start up the ventilation fan. If you select AL for one of the exit relays, the default switching
temperature is 30ºC, when this contact will close.
FOFF
– This step is permanently off (Fixed off)
FON
– this step is permanently on (Fixed on)
Default setting is
AUTO
4.0 MANUAL SWITCHING
4.1 Sometimes there is no load on the system when the relay is commissioned. In order to test everything is
working correctly, the best way is to switch steps in manually and watch the increase in the Cos Phi display
until a leading power factor is achieved, and then to return the relay to AUTO to make sure the relay
switches out to reach the target power factor.
Press
◄
repeatedly to get back to Cosphi in the display
▼
- INFO
▼
- MANUAL
Now enter manual mode ,
►
by holding down the
►
key for 3 secs
,
Scroll up
▲
and the figure 1 is in the
display. This is step 1 – to switch step 1 on key
►
., to switch off
►
again. Now move through the steps using
▲
to get to the next step and
►
to switch it on. Under low loads on the system this will create a leading
power factor.
To switch back to Automatic control, so as to check the relay is working correctly, press
◄
repeatedly until
MANUAL-INFO-SETUP disappear from the right hand side of the display, so the relay is now in its normal
AUTO switching function , and if the Cos phi is leading it should switch steps out to achieve the target
Cosphi
(as set in 3.8)
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