Compact Electric CDMR-51 Handbuch - Seite 8

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Line Monitoring Relay CDMR-51
If the Parameter „fU Connect-Logic" is turned off, the settings U> / U< und f> are taken as tripping values also after the
connection.
Functional diagram for activated setting of:
- Lock-out Time
- Lock-out Relays
- 10 Min. Mean value
U
- fU Connect-Logic
115% (U>>)
112% (U>)
110% (U >)
z
100%
90% (U <)
z
80% (U<)
10 Min.
Mean val.
K1 K2
,
f
51,50 Hz (f>>)
50,05 Hz (f >)
z
50,00 Hz
47,5 Hz (f<)
K1 K2
,
FIG.3 FUNCTIONAL DIAGRAM
Security Code / Change-Access Release
To prevent unauthorized changing of setting values via the front panel, a three-digit security code can be stored in the
data memory. It has to be entered to get permission to alter parameter values.
If the security code is 000, the security sequence is not active and is replaced by a simple menue with a self-
incremented change-access counter (see step 3 above). The value of this counter may be used as indication of any
access to the change mode. The security code can be modified in the menue "Special Settings \ Security code". Subse-
quent changing of the code is possible, but also in this case the active code has to be entered to get the permission for
changing.
Supply Voltage
Usually a buffered DC voltage is used as supply voltage of the relay. For special applications any line voltage from 70V
AC to 300V AC /45Hz-65Hz (absolute minimum and maximum voltage) may be used, but attention has to be payed to
the fact, that all output relays are de-energized in case of total line failure and complete correct recording of the tripping
values in the event buffer cannot be assured.

Event Recording Buffer

Any initial tripping event is recorded in a non-volatile buffer with a data set containing tripping function and currently
measured line values at the tripping instant. This information is displayed in the menue "Event Monitor / Last Trip" and is
only available for the last trip. Related to each tripping function the following measurement values are stored:
U<<, U<, U>, U>>:
CDMR51e_man_A11.doc
/ User Manual
10 Min.
Lock-out
Mean val.
Time
Frequency curve
Lock-out
t
Time
a
star voltages or delta voltages,
Voltage curve
Lock-out
t
a
Time
Legende: U
Lock-out
t
Time
a
Page 8
Lock-out
t
a
Time
= Connection Voltage
z
f
= Connection Frequency
z
t
= Tripping Time
a
K1 K2
,
= Negated Output Relays
t
t