Line Monitoring Relay CDMR-61 / User Manual
Page
4
Introduction:
The CDMR-61 is a digital line monitoring relay based on a new generation microcontroller. It provides 13 monitoring
functions listed below with identification symbols.
U< ... undervoltage stage 1
f< ... underfrequency stage 1
Vs> ...vector surge
U<< ... undervoltage stage 2
f<< ... underfrequency stage 2
Asy ... voltage asymmetry
U<<<
undervoltage stage 3
f> ... overfrequency stage 1
Psy ... phase angle asymm.
U> ... overvoltage stage 1
f>> ... overfrequency stage 2
SEQ ...phase sequence
U>> ... overvoltage stage 2
Configuring the relay
If the relay is configured via the front panel see also fig. 3 and fig.4 (page 10,11) for basic information. If the serial com-
munication program is used see page 8 for more information
.
1. After connection to power supply a standard menue "Line .... " is displayed showing the
line frequency and voltages. Starting from this menue you can step to any menue of the
scheme by first scrolling up or down to the desired main-level menue with the keys
↑
and
↓
and then branching with the ENTER key into the chain of detailed-menues. The de-
tailed-menues may again be scrolled up and down by the
↑
and
↓
keys.
Line / 50.00Hz
230V 230V 230V
2. First the parameter for 3- or 4-wire mains (main menue "General Settings") shall be
set, because different data sets are used for voltage limits in star-type and delta connec-
tion.
3. Configure the desired monitoring functions: Step to the main menue of the function (ex-
ample U<< on the left side). The identification symbol of the function is always placed in
the right corner of the first displayline (both in the main-level menue and the chain of
detailed-menues). In the second displayline the output relay(s) assigned to the function
are listed: e.g. "K1__4_" means, that both output relays K1 and K4 will be switched to
the alert state in the case of U<<. The assignment can be configured in the detailed-
menue "Output-Relay U<<".
Undervoltage U<<
Stage2 K1__4_ <-
If
no output relay
is assigned to a monitoring function this function is
disabled
,
(second displayline = "K_____").
How to change settings see page 6.
Unterspanng. U<
Stufe1 K_____<-
Configuring star-type or delta connection
Setting menue: "General Settings \ 3-/4-Wire Mains".
In the star-type configuration the line-to-neutral voltages are monitored and displayed in the main "Line ...." menue. The
line-to-line voltages are also measured, but not used for monitoring. These values can be displayed in the alternative
"Line ....." menue (see fig.3). In delta connection the line-to-line voltages are monitored and displayed in the main "Line
...." menue, the neutral point is reproduced internally. The resulting star voltages can be displayed in the alternative "Line
... " menue. If star-type connection is selected, only the star voltage limits are displayed and changeable, if delta con-
nection is selected, this applies to delta voltages. The upper and lower limits of all voltage monitoring functions are
saved in different data sets. In the PC configuration program this matter is handled in the same way.
Connection to a single-line system
Connect the single line to inputs L1, L2 and L3 and select star-type connection.
Voltage monitoring U<<<, U<<, U<, U>, U>>
The rms values of the 3 star voltages and 3 delta voltages are measured and refreshed in 20ms intervalls at 50Hz .
Details for monitoring see above. Voltage monitoring is single phase sensitive, any undervoltage function is energized, if
at least one voltage is below the low-limit value, any overvoltage function is energized, if at least one voltage is above the
upper-limit value. Undervoltage energizing may be inhibited by the external blocking input "B" (see page 7).
If the
line voltage
is used as
supply voltage
, it is strongly recommended to configure the U<<<,U<< and U< functions
with
negated output relays
, because otherwise no tripping is possible in the case of line voltage failure.
CDMR61e_man_A1.doc
