Table of Contents
Advertisement
3 INSTALLATION
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.
WARNING
The label found on the left side of the relay specifies its order code or model number. The installed power sup-
ply operating range will be one of the following.
LO:
25 to 60 V DC or 20 to 48 V AC
HI:
88 to 300 V DC or 70 to 265 V AC
Ensure the applied control voltage matches the requirements of the relay's switching power supply. For exam-
ple, the HI power supply will work with any DC voltage from 88 to 300 V, or any AC voltage from 70 to 265 V.
The internal fuse may blow if the applied voltage exceeds this range.
Correct polarity must be observed for all logic input connections or equipment damage may
result.
CAUTION
External contacts can be connected to the 16 logic inputs. As shown, these contacts can be either dry or wet. It
is also possible to use a combination of both contact types.
A dry contact has one side connected to terminal D11. This is the +32 V DC voltage rail. The other side of the
dry contact is connected to the required logic input terminal. When a dry contact closes, a current of 2.2 mA will
flow through the associated circuit.
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 logic input terminal. In addition, the negative side of the external
source must be connected to the relay DC NEGATIVE rail at terminal D12. The maximum external source volt-
age for this arrangement is 300 V DC.
GE Power Management
Figure 3–10: CONTROL POWER CONNECTION
745 Transformer Management Relay
3.2 TYPICAL WIRING
3.2.8 CONTROL POWER
3.2.9 LOGIC INPUTS
3-9
3
Advertisement
Table of Contents
