Control Power; Phase Cts - GE 169 Instruction Manual

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GE Power Management
2 INSTALLATION

2.4 Control Power

Control power for the relay is nominally either 120/240 VAC at 50 Hz/60 Hz or either 24, 48, 125, or 250 VDC. The
AC voltage is selected by means of a slide switch on the power supply circuit board as shown in Figure 2-8. If an
alternative voltage is selected, ensure that the control power label on the back of the 169 Relay reflects the change.
This board is accessed by removing the perforated cover on the rear of the unit. The switch must be correctly set
before control power is applied to the 169. Maximum power consumption for the unit is 40 VA (AC version) or 30 W
(DC version).
The 169 will operate properly over a wide range of supply voltages typically found in industrial environments (see
control power specifications in section 1.5). When the supply voltage drops below the minimum, the output relays
will return to their power down states but all setpoints and statistical data will remain stored in the relay memory.
Motor lock-out time will be adhered to with or without control power applied.
Control power must be applied to the 169 relay, and the relay programmed, before the motor is energized. Power is
applied at terminals 41, 42, and 43 which is a terminal block having #6 screws.
NOTE: Chassis ground terminal 42 must be connected directly to the dedicated cubicle ground conductor to
prevent transients from damaging the 169/169 Plus resulting from changes in ground potential within the
cubicle.
AC VOLTAGE SELECTION SWITCH
A100 PC BOARD
Figure 2-8 AC Voltage Selection (120/240 VAC models only)

2.5 Phase CTs

One CT for each of the three motor phases is required to input a current into the relay proportional to the motor
phase current. The phase sequence must be as shown in Figures 2-4 and 2-7 in order for the phase reversal
function to operate properly. If two phase CTs are used as shown in Figure 2-6 the phase reversal function cannot
be used (see section 3.19). The CTs used can have either a 1 amp or 5 amp secondary and should be chosen so
that the motor full load current is between 50 and 95 percent of the rated CT primary amps. The CT ratio should
thus be of the form n:1 or n:5 where n is between 20 and 1500. The ratio of the CT used must be programmed into
the 169 (see section 3.7).
The CT connections to the relay are made between the ":1" and "COM" terminals for 1 amp CTs or between the ":5"
and "COM" terminals for CTs with a 5 amp secondary. The connections to the 169 internal phase CTs are made
directly via #10 screws.
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