Trinity ACCUVAR, Руководство пользователя, Страница: 17 / 27

pg. 17
TRINITY
ACCUVAR - Operational Manual
Thus, in a fifteen-stage relay, alarm mode NO means a 15 stage Relay, while alarm mode
other than NO will make it as 15 stage Relay, with 16
th
stage used as an alarm contact. There
are two additional parameters which need to programmed. i.e. Alarm Limit and Alarm Delay.
In Alarm mode, if the selected parameter remains below/above the Alarm Limit, continuously
for Alarm Delay time, the alarm relay will become ON. The hooter connected to this stage can
be silenced by pressing any key. Alarm Mode can be set on PF, I_THD, V_THD or NO. Alarm
mode PF will cause alarm when PF remains below the limit. For alarm mode I_THD or V_THD,
alarm will occur when the THD values for current/voltage are above the programmed ALARM
LIMIT. The Alarm Limit is programmable from 0.800 to 0.999 for PF Mode. same can be set
between 10 to 80% of V_THD & I_THD. The sign of PF is not considered. Alarm Delay value
can be set from 20 to 180 seconds.
To set the above parameters, proceed the following instructions:
Once in the programming mode,
1. Set Arrow (>) to the desired parameters using and keys and press key. Now
Arrow (>) starts blinking which means value of this parameter can be set now. Set desired
value by using and keys and again press key to save its value.
2. If other parameters need to be changed, do so using similar method. Else, press key
for about four seconds continuously. The unit will restart and enter into run mode.
5. Setting Switch Delay, Damp, Reference Bank number and Auto Phase Input
Detection
Switch Delay is one type of digital dead band. In fast switching mode Value can be set from
1 to 10 and in normal switching mode value can be set from 40 to 120. The Damp value
should be set from 5 to 20 in normal switching mode and 1 to 10 in fast switching mode so
as to slow down the response of the control algorithm. Setting a higher value of DAMP will
slow down the response of the relay to transient jumps in system KVAR values. The unit
will switch ON and OFF the bank number selected by user in REF_BANK, in order to detect
phase sequence of inputs.
NOTE: Make sure to connect three phase capacitor bank on selected REF_BANK number.
Auto phase input detection can use to detect phase sequence error and correct all values
according to detection. In order that this feature works, the load current should have a value