Contact Inputs; Trip And Close Output Relays - GE 339 Instruction Manual

ELECTRICAL INSTALLATION

Contact inputs

CAUTION:
CAUTION

Trip and Close output relays

2–16
Figure 19: Control power connection
CONTROL
P P OWER
HEAVY COPPER CONDUCTOR HEAVY COPPER CONDUCTOR
OR BRAIDED WIRE OR BRAIDED WIRE
SWITCHGEAR
GROUND BUS GROUND BUS
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 20: Wet contact connections
Wet Contact Connection
Contact Input Common C11
The relay is equipped with seven electromechanical output relays: 2 Form A (Relay 1, Relay
2), and 5 Form C (Relays 3 to 7).
When SWITCHING DEVICE is selected as BREAKER:
Output Relays:
+
-
B2 B1
A1
- +
CONTROL
POWER
339 RELAY
Contact Input 1 C1
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
RELAY
898735.CDR 898735.CDR
V DC Power
Supply
LOGICIN.CDR