Trinity ACCUVAR, Руководство пользователя, Страница: 22 / 27

pg. 22
TRINITY
ACCUVAR - Operational Manual
2. Resetting Average PF
The integrated average PF can be reset by pressing key in Run Mode for about 5
seconds continuously. This integrated average PF is basically the ratio of KWh & KVAh
energy consumption since last reset of energy or Average PF value. After reset the value
will go to 1.00.
3. Freezing and unfreezing the AutoScroll
The Run Mode displays will always auto scroll by default with an interval of about 5 to 6
seconds. Each display can be frozen or unfrozen by pressing key and also be moved
up and down by pressing and keys. When the display is frozen at one page, the
display will show a ‘F’ in the lower right corner of display.
Control Outputs
The relays are protected by snubbers against fast voltage transients which occur when
inductive loads are switched off and therefore, the following points should be taken care when
using these relay contacts:
•
Use 230V AC coils only in the contactors. DO NOT use 440V AC coils.
•
DO NOT switch small loads like electronic Hooters, small relays with 230V AC coils etc.,
directly from the relay contact of ACCUVAR. If done so, the small leakage current from
the snubbers will not allow these loads to be switched off fully. The electronic hooters
thus will give a low hum continuously, and the small relays will switch on but not switch
off.
•
Use these relay contacts to switch an Auxiliary contactor and put the load on the
contactor contacts.
For correct operation, various points in the system need attention and unless these are
correctly set up, proper operation cannot be expected.
These points are noted in section (A) and (B) such as subsequent sections deal with
operational checks, setting up and trouble shotting.
System Considerations:
The Relay senses the total resultant power factor of the system and switches the Capacitors
through the appropriate control gear in the panel so as to correct the power factor to the
required level.