M98228201-03-14A computer MAX 6 / computer MAX 12
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The available programs of Computer
MAX regulator are listed in table 5.2. The default factory setting of
Computer
MAX devices is 1:1:1:1
Table 5-2.- Available configuration programs for Computer
MAX devices
Screen Indication Stage’s configuration
111 1:1:1:1:1….
122 1:2:2:2:2….
124 1:2:4.4:4….
248 1:2:4:8:8….
112 1:1:2:2:2….
224 1:2:2.4:4….
123 1:2:3.3:3….
234 1:2:3.4:4….
236 1:2:3.6:6….
246 1:2:4.6:6….
5.6 Connection and re-connection time settings:
To set-up this parameter, use the keys
until the cursor points to the option , then push
This parameter sets up the delay times of the device. The setting value, Tc, is the delay time between the
connection or disconnection of successive capacitor stages. The parameter also sets up the called re-
connection delay, Tr, which is the minimum time that must elapse between the disconnection of a C stage
and its following connection. The range of Tc settings goes from 4 s to 999 s. Tr is automatically set to 5
times Tc (Notice that Tr is needed to guarantee the capacitors discharge). The default setting of Tc is
10 s.
5.7 Selection of the number of stages.
To set-up this parameter, use the keys
until the cursor points to the option , then push
This setting allows the selection of the number of stages of the PF compensation equipment. Depending
on the device type, Computer
MAX 6 or MAX 12 we can select up to 6 or 12 stages. If the number of
stages is less than 6 or 12 respectively in Computer
MAX 6 or MAX 12 the relay number 6 or 12 is
automatically assigned as alarm relay (see paragraph 3.3)
5.8 U,I phase angle setting.
To set-up this parameter, use the keys
until the cursor points to the option , then push
During the set-up of this parameter, the screen shows alternatively one of the options T1 to T6 and the
cos.
This parameter permits the adaptation of the regulator to different options of connection of voltage and
current measurement in the three phase system. The default assumed connection is the one shown in
figs. 4.2 and 4.3, i.e., the current transformer placed in phase L1 and voltage measurement between
phases L2 (terminal C) and L3 (terminal D). Sometimes it’s difficult to guarantee this connection or even
check how it is. To adapt to this unknown situations the Computer MAX devices allow the selection of
different options, T1 to T6, as shown in table 5.3. To select the right option during start up, you should
verify that there is load and that the loads are mainly inductive with a cos between 0,7 y 1. In this
situation try the different options until the cos screen shows a value between 0,7 and 1.
Table 5-3.- Phase shift options in Computer
MAX
Screen
U-I phase shift at
cos=1
V measured in phases CT placed in phase
T1 30º L3-L2 L3
T2 270º L3-L2 L1
T3 150º L3-L2 L2
T4 210º L3-L2 L3 (P1-P2 or S1-S2 reversed)
T5 90º L3-L2 L1 (P1-P2 or S1-S2 reversed)
T6 330º L3-L2 L2 (P1-P2 or S1-S2 reversed)
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