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QUICK REFERENCE GUIDE
3.1
Ratings and polarities:
Note
3.2
Digital inputs:
3.3
Analog inputs and outputs
469 MOTOR MANAGEMENT RELAY – QUICK REFERENCE GUIDE
•
Control voltage matches the ratings and polarities of the relay power supply. Control
power supplied to the relay must match the installed power supply range. All grounds
must be connected for normal operation regardless of control power supply type. The
label found on the left side of the relay specifies its order code or model number. The
installed power supply's operating range will be one of the following:
LO: 20 to 60 V DC or 20 to 48 V AC
HI: 88 to 300 V DC or 70 to 265 V AC
•
The relay ground connections 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.
•
Current transformer input ratings and polarities match the secondary ratings of the
corresponding CT. For the correct operation of many relay features, the instrument
transformer polarities shown Figure 8: on page 8 must be followed.
IMPORTANT: The phase and ground current inputs will correctly measure to 20 times the
current input's nominal rating.
•
The phase sequence is user programmable to be either ABC or ACB rotation.
•
Voltage transformer input ratings match the secondary ratings of the VT. The 469
relays have four channels for AC voltage inputs, each with an isolating transformer.
The nominal secondary voltage must be in the 50 to 240 V range. The three phase
inputs are designated as the 'bus voltage'. The Bus VT connections most commonly
used, delta (or open delta), is shown in Figure 8: on page 8. Be aware that these voltage
channels are internally connected as wye. This is why the jumper between the phase B
terminal and the Vcom terminal must be installed with a delta connection.
•
Digital inputs are connected as indicated below. Ensure correct polarity and do not
connect any logic input circuits to ground or else relay hardware may be damaged.
FIGURE 9: Dry and wet contact connections
•
Analog outputs are connected as indicated in Figure 8: on page 8. Also refer the
following figure. Note that the shield of the cable shall be grounded at one point only,
usually at the PLC/computer end only.
9
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