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ELECTRICAL INSTALLATION
Control power
CAUTION:
CAUTION
CAUTION:
CAUTION
CAUTION:
CAUTION
NOTE:
NOTE
Contact inputs
CAUTION:
CAUTION
2–12
Courtesy of NationalSwitchgear.com
Control power supplied to the relay must match the installed power supply range. If the
applied voltage does not match, damage to the unit may occur. All grounds MUST be
connected for safe, normal operation regardless of control power supply type.
The label found on the relay specifies its order code or model number. The installed power
supply's operating range will be one of the following:
LO: 24 to 48 V DC (Range: 20 to 60 V DC)
HI: 125 to 250 V DC/120 to 240 V AC (Range: 84 to 250 V DC/66 to 265 V AC)
The relay should be connected directly to the ground bus, using the shortest practical
path. A tinned copper, braided, shielding and bonding cable should be used. As a
minimum, 96 strands of number 34 AWG should be used. Belden catalog number 8660
is suitable.
Isolate power prior to servicing.
An external switch, circuit breaker, or other protective device must be connected near to
the equipment.
Figure 13: 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.
B2
A1
B1
-
+
CONTROL
POWER
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
RELAY
898735.CDR
898735.CDR
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