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CHAPTER 2: INSTALLATION
Output Relay 1 (TRIP)
897786.cdr
Contact inputs
CAUTION:
345 TRANSFORMER PROTECTION SYSTEM – QUICKSTART GUIDE
Figure 2-21: Relay #1 Trip and Relay #2 Trip circuits with voltage monitoring
DC +
A2
B3
V
A3
52a
contact
Trip
Coil
External contacts can be connected to the relay's ten (10) digital inputs. These contacts are
wet only.
The inputs can be programmed to different thresholds depending on the DC voltage (17,
33, 84, 166).
Ensure correct polarity on contact input connections and do not connect any contact
input circuits to ground or else relay hardware may be damaged.
A wet contact has one side connected to the positive terminal of an external DC power
supply. The other side of this contact is connected to the required contact input terminal. In
addition, the negative side of the external source must be connected to the relay's DC
negative rail at Terminal C11. The maximum external source voltage for this arrangement
is 300 V DC.
Figure 2-22: Wet contact connections
Wet Contact Connection
Contact Input Common C11
Output Relay 2 (TRIP)
External
jumper
DC -
345 RELAY
Contact Input 1
C1
ELECTRICAL INSTALLATION
B4
A4
V
B5
52a
contact
Trip
Coil
V DC Power
Supply
LOGICIN.CDR
DC +
External
jumper
DC -
33
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