Differential Relay Terminals (169 Plus); Speed Switch Terminals (169 Plus); Programming Access Terminals; Rs-422 Serial Communications Terminals (169 Plus) - GE 169 Instruction Manual

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GE Power Management
2 INSTALLATION
A twisted pair of wires should be used. Connection to the 169 is made via a terminal block which can accommodate
up to #12 AWG multi-strand wire.

2.15 Differential Relay Terminals (169 Plus)

Terminals 48 and 49 are provided for connection to a differential relay. This allows an external differential relay to be
connected to a 169 Plus relay. A contact closure between these terminals will cause an immediate activation of the
output relay assigned to the differential relay input function. After a DIFFERENTIAL INPUT TRIP terminals 48 and
49 must be open circuited in order to reset the relay.
If no differential relay is to be used terminals 48 and 49 should be left open.
A twisted pair of wires should be used. Connection to the 169 is made via a terminal block which can accommodate
up to #12 AWG multi-strand wire.

2.16 Speed Switch Terminals (169 Plus)

Terminals 50 and 51 are provided for connection to an external speed switch. This allows the 169 Plus relay to
utilize a speed device for locked rotor protection. During a motor start attempt if no contact closure between
terminals 50 and 51 occurs within the "SPEED SWITCH TIME DELAY" (SETPOINTS, page 5) the output relay
assigned to the speed switch function will activate. This function must be enabled in order for operation to occur
(SETPOINTS, page 5). After a SPEED SWITCH TRIP terminals 50 and 51 must be open circuited in order to reset
the relay.
If no speed switch is to be used terminals 50 and 51 should be left open.
A twisted pair of wires should be used. Connection to the 169 is made via a terminal block which can accommodate
up to #12 AWG multi-strand wire.

2.17 Programming Access Terminals

When a jumper wire is connected between ACCESS terminals 52 and 53 all setpoints and configurations can be
programmed using the keypad. Once programming is complete the jumper will normally be removed from these
terminals. When this is done all actual and setpoint values can still be accessed for viewing; however, if an attempt
is made to store a new setpoint value the message "ILLEGAL ACCESS" will appear on the display and the previous
setpoint will remain intact. In this way all of the programmed setpoints will remain secure and tamperproof.
Alternatively, these terminals can be wired to an external keyswitch to permit setpoint programming upon closure of
the switch.
A twisted pair of wires should be used for connection to an external switch. Connection to the 169 is made via a
terminal block which can accommodate up to #12 AWG multi-strand wire.

2.18 RS-422 Serial Communications Terminals (169 Plus)

Terminals 46 and 47 are provided for a digital serial communication link with other 169 Plus relays, computers, or
programmable controllers. Up to 20 169 Plus "SLAVES" can be connected to one "MASTER" (169 Plus or other
device) as shown in Figure 2-9. If devices other than 169 Plus relays are to be connected in the serial link a copy of
the "Multilin 169 Plus Relay Communication Protocol" will be required. This can be obtained by contacting Multilin.
Note that when using a device other than a 169 Plus to program a 169 Plus SLAVE, setpoints sent to the SLAVE
must be within the ranges listed in Table 3-3.
Each communication link must have only one MASTER. If the MASTER is a 169 Plus this relay cannot be used for
motor protection. Only relays programmed as SLAVEs can be used for motor protection. The MASTER should be
centrally located and can be used to view ACTUAL VALUES and SETPOINTS from each relay SLAVE. SETPOINTS
in each SLAVE can also be changed from the MASTER. In order to do this the MASTER relay must have its Access
terminals (52,53) shorted together.
Relays are programmed as MASTER or SLAVE using the last 2 setpoints of page 5 of SETPOINTS mode (see
section 3.4). Each SLAVE in the communication link must be programmed with a different SLAVE ADDRESS.
When a relay is programmed as a MASTER it will display all of the ACTUAL VALUES and SETPOINTS of the SLAVE
relay it is addressing. To view data from a different SLAVE the ADDRESSED SLAVE setpoint must be changed.
To avoid contention and improper reading of data ensure that the following conditions are met:
1. Each communication link has only one MASTER.
2. Each 169 Plus SLAVE in the link has a different SLAVE ADDRESS.
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