1. What is the difference between Firmware and Software?

Firmware is the program running inside the relay, which is responsible for all

relay protection and control elements. Software is the program running on the

PC, which is used to communicate with the relay and provide relay control

remotely in a user friendly format.

2. How can I obtain copies of the latest manual and PC software?

I need it now!:via the GE Multilin website athttp://www.GEindustrial.com/

multilin

I guess I can wait:fax a request to the GE Multilin Literature department at

(905) 201-2113

3. Cannot communicate through the front port (RS232).

Check the following settings:

• Communication Port (COM1, COM2, COM3 etc.) on PC or PLC

• Parity settings must match between the relay and the master (PC or PLC)

• Baud rate setting on the master (PC or PLC) must match RS232 baud

rate on the 369 relay.

• Cable has to be a straight through cable, do not use null modem cables

where pin 2 and 3 are transposed

• Check the pin outs of RS232 cable (TX - pin 2, RX - pin 3, GND - pin 5)

4. Cannot communicate with RS485.

Check the following settings:

• Communication Port (COM1, COM2, COM3 etc.) on PC or PLC

• Parity settings must match between the relay and the master (PC or PLC)

• Baud rate must match between the relay and the master

• Slave address polled must match between the relay and the master

• Is terminating filter circuit present?

• Are you communicating in half duplex? (369 communicates in half

duplex mode only)

• Is wiring correct? (“+” wire should go to “+” terminal of the relay, and “–”

goes to “–” terminal)

• Is the RS485 cable shield grounded? (shielding diminishes noise from

external EM radiation)

Check the appropriate communication port LED on the relay. The LED should

be solidly lit when communicating properly. The LED will blink on and off when

the relay has communication difficulties and the LED will be off if no activity

detected on communication lines.

5. Can the 4 wire RS485 (full duplex) be used with 369?

No, the 369 communicates in 2-wire half duplex mode only. However, there

are commercial RS485 converters that will convert a 4 wire to a 2 wire system.

6. Cannot store setpoint into the relay.

Check and ensure the ACCESS switch is shorted, and check for any PASSCODE

restrictions.

7. The 369 relay displays incorrect power reading, yet the power system is

balanced. What could be the possible reasons?

It is highly possible that the secondary wiring to the relay is not correct.

Incorrect power can be read when any of the A, B, or C phases are swapped, a

CT or VT is wired backwards, or the relay is programmed as ABC sequence

when the power system is actually ACB and vice versa. The easiest way to

verify is to check the voltage and the current phasor readings on the 369 relay

and ensure that each respective voltage and current angles match.

8. What are the merits of a residual ground fault connection versus a core

balance connection?

The use of a zero sequence (core balance) CT to detect ground current is

recommended over the G/F residual connection. This is especially true at

motor starting. During across-the-line starting of large motors, care must be

taken to prevent the high inrush current from operating the ground element

of the 369. This is especially true when using the residual connection of 2 or 3

CTs.

In a residual connection, the unequal saturation of the current transformers,

size and location of motor, size of power system, resistance in the power

system from the source to the motor, type of iron used in the motor core &

saturation density, and residual flux levels may all contribute to the

production of a false residual current in the secondary or relay circuit. The

common practice in medium and high voltage systems is to use low

resistance grounding. By using the “doughnut CT” scheme, such systems offer

the advantages of speed and reliability without much concern for starting

current, fault contribution by the motor, or false residual current.

When a zero sequence CT is used, a voltage is generated in the secondary

winding only when zero sequence current is flowing in the primary leads.

Since virtually all motors have their neutrals ungrounded, no zero sequence

current can flow in the motor leads unless there is a ground fault on the motor

side.

9. Can I use an 86 lockout on the 369?

Yes, but if an external 86 lockout device is used and connected to the 369,

ensure the 369 is resetpriorto attempting to reset the lockout switch. If the

369 is still tripped, it will immediately re-trip the lockout switch. Also, if the

lockout switch is held reset, the high current draw of the switch coil may

cause damage to itself and/or the 369 output relay.

10. Can I assign more than one output relay to be blocked when using Start

Inhibits?

Yes, but keep in mind that if two output relays are wired in series to inhibit a

start it is possible that another element could be programmed to control one

or both of the relays. If this is happening and the other element is

programmed with a longer delay time, this will make it seem as if the Start

Inhibit is not working properly when in fact, it is.

11. Can I name a digital input?

Yes. By configuring the digital input as "General" a menu will appear that will

allow naming.

12. Can I apply an external voltage to the digital inputs on the 369?

No. The 369 uses an internal voltage to operate the digital inputs. Applying an

external voltage may cause damage to the internal circuitry.

13. Can I upload setpoint files from previous versions to the latest version of

firmware?

Yes, with the exception of setpoint files from versions 1.10 and 1.12.

Unfortunately these setpoint files must be rewritten, as they are not

compatible.

14. What method does the 369 use to calculate current unbalance?

The 369 uses the NEMA method. Previous revisions of the 369 manual have

incorrectly included a functional test that measured the ratio of negative

sequence current to positive sequence current. The NEMA method is as

follows:

To prevent nuisance trips/alarms on lightly loaded motors when a much

larger unbalance level will not damage the rotor, the unbalance protection will

automatically be defeated if the average motor current is less than 30% of the

full load current (IFLA) setting.

15. I need to update the options for my 369/RRTD in the field, can I do this?

Yes. All options of the 369/RRTD can be turned on or added in the field. To do

this contact the factory.

16. Can I test my output relays?

Yes, but keep in mind that the output relays cannot be forced into a different

state while the motor is running.

17. Is the communication interface for Profibus RS232 or RS485?

It is RS485. The 9-pin connector on the rear of the 369 is the connector used

by the manufacturer of the Profibus card and although it is a DB-9, the

electrical interface is RS485.

18. Can I use the options enabler code to upgrade my 369 in the field to get the

Profibus option?

Yes, but keep in mind that there is a Profibus card that is required and is not

installed in units that were not ordered from the factory with the Profibus

option.

19. Can the 369 be used as a remote unit, similar to the 269 remote?

Yes. Every 369 can be used as remote. When ordering the 369, an external 15

foot cable must be ordered.

20. Can the RRTD module be used as a standalone unit?

Yes. The RRTD unit with the IO option, has 4 output relays, 6 digital inputs and

4 analog outputs. With this option the RRTD can provide temperature

protection.

21. Why is there a filter ground and a safety ground connection? Why are they

separate?

The safety ground ensures operator safety with regards to hazardous shocks;

the filter ground protects the internal electronic circuitry from transient noise.

These two grounds are separated for hi-pot (dielectric strength) testing

purposes. Both grounds should be tied to the ground bus external to the relay.

22. 369 doesn't communicate with ethernet after change in IP address, what

should I do?

Cycle the power supply to the 369. In order to make the new IP address active

the power supply of the 369 must be recycled after changing or setting the IP

address of the relay.

1. Can I send a 269 setpoint file to a 369 relay?

Yes. Using the 369 PC program, a 269 setpoint file can be sent to the

369. Note: any settings/features that are not in the 269 setpoint file will

not be changed on the 369 unit and will be set as default values. All

setpoints should be confirmed before operating the relay.

2. Can I use an 86 lockout on the 369?

Yes, but If an external 86 lockout device is used and connected to the

369, ensure that the 369 is reset prior to attempting to reset the lockout

switch. If the 369 is still tripped, it will immediately retrip the lockout

switch. Also, if the lockout switch is held reset, the high current draw

of the lockout switch coil may cause damage to itself and/or the 369

output relay.

3. Can I assign more than one output relay to be blocked when

using Start Inhibits?

Yes, but keep in mind that if two output relays are wired in series to

inhibit a start, it is possible that another element could be programmed

to control one or both of the relays. If this is happening and the other

element is programmed with a longer delay time, this will make it seem

as if the Start Inhibit is not working properly when in fact, it is.

4. Can I connect three voltage transformers to achieve a delta

configuration in the 369?

Yes, but it is unnecessary since the 369 will calculate Vca based on

the measured Vab and Vcb.

5. Can I name a digital input?

Yes. By configuring the digital input as "General", a menu will appear

that will allow naming.

6. Can I apply an external voltage to the digital inputs on the 369?

No. The 369 uses an internal voltage to operate the digital inputs.

Applying an external voltage may cause damage to the internal

circuitry.

7. No display, no characters on the display, but there is a backlight.

Press the HELP key, when all the LEDs are illuminated, press ENTER

to automatically set the contrast to 145. You may also communicate

with the relay using the 369 PC program to check the contrast setting.

8. What are the merits of a residual ground fault connection versus

a core balance connection?

The use of a zero sequence (core balance) CT to detect ground

current is recommended over the G/F residual connection. This is

especially true at motor starting. During across-the-line starting of

large motors, care must be taken to prevent the high inrush current

from operating the ground element of the 369. This is especially true

when using the residual connection of 2 or 3 CTs. In a residual

connection, the unequal saturation of the current transformers, size

and location of motor, size of power system, resistance in the power

system from the source to the motor, type of iron used in the motor

core and saturation density, and residual flux levels may all contribute

to the production of a false residual current in the secondary or relay

circuit. The common practice in medium and high voltage systems is

to use low resistance grounding. By using the doughnut CT scheme,

such systems offer the advantages of speed and reliability without

much concern for starting current, fault contribution by the motor, or

false residual current. When a zero sequence CT is used, a voltage is

generated in the secondary winding only when zero sequence current

is flowing in the primary leads. Since virtually all motors have their

neutrals ungrounded, no zero sequence current can flow in the motor

leads unless there is a ground fault on the motor side.

9. Can I upload setpoint files from previous versions to the latest

version of firmware?

Yes, with the exception of setpoint files from versions 1.10 to 1.12.

Unfortunately, these setpoint files must be rewritten, as they are not

compatible.

10. Can I use the learned values with motors that have start times

faster than 500 milliseconds?

Yes, but keep in mind that for motors that have start times faster than

500 milliseconds, there will not be any data for the very first start. For

following starts, the 369 will be able to provide data based on previous

start information.

11. I need to update the options for my 369/RRTD in the field, can I do

this?

Yes. All options of the 369/RRTD can be turned on or added in the

field except for the Profibus and Ethernet options for the 369. To do

this, contact the factory.

12. Can the 369 be used as a remote display unit, similar to the 269

remote?

Yes. Every 369 can be used as remote. When ordering the 369, an

external 15 foot cable must be ordered.

13. Is there a limit to the lead length of my RTD?

Yes. Correct operation will occur providing all three wires are of the

same length and the resistance of each lead is not greater than 25% of

the RTD 0°C resistance. This can be accomplished by using identical

lengths of the same type of wire. If 10 ohm copper RTD's are used,

special care should be taken to keep the lead resistance as low as

possible.

14. I cannot store setpoints into the relay.

Check and make sure the ACCESS switch is shorted (terminals 57 and

58). Also, check for any PASSCODE restrictions from page S1

Setpoints / 369 Setup / Setpoint Access.

15. Can the RRTD module be used as a standalone unit?

Yes. The RRTD unit with the IO option has 4 output relays, 6 digital

inputs, and 4 analog outputs. With this option, the RRTD can provide

temperature protection.

16. The 369 relay displays a high unbalance reading (or wrong power

reading), yet the power system is balanced, what could be the

possible reasons?

It is highly possible that the secondary wiring to the relay is not correct.

High unbalance (and wrong power) can be read when any of the A, B,

or C phases are swapped, or the relay is programmed as ABC

sequence when the power system is actually ACB and vice versa. The

easiest way to verify is to check the voltage and the current phasor

readings on the 369 relay and make sure that each of the respective

voltage and current angles match.

17. Can 4-wire RS485 (full duplex) be used with 369?

No, the 369 communicates in 2-wire half-duplex mode only. However,

there are commercial RS485 converters that will convert a 4-wire to a

2-wire system.