Multilin 469 Motor Management Relay ... - GE Digital Energy
Multilin 469 Motor Management Relay ... - GE Digital Energy
Multilin 469 Motor Management Relay ... - GE Digital Energy
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5.4 S3 <strong>Digital</strong> Inputs<br />
5.4.1 Description<br />
CHAPTER 5: SETTINGS<br />
Overview<br />
The <strong>469</strong> relay has nine (9) digital inputs. Five of the digital inputs have been pre-assigned<br />
as switches having a specific function. Four of the five pre-assigned digital inputs are<br />
always functional and do not have any settings messages associated with them. The fifth,<br />
Starter Status, may be configured for either an 'a' or 'b' auxiliary contact. The remaining<br />
four digital inputs are assignable; that is to say, the function that the input is used for may<br />
be chosen from one of a number of different functions. Some of those functions are very<br />
specific, others may be programmed to adapt to the user requirements. If the Two-Speed<br />
<strong>Motor</strong> feature is enabled, Assignable Input 4 will be dedicated as the Two-Speed <strong>Motor</strong><br />
Monitor.<br />
Access Switch<br />
Terminals C1 and C2 must be shorted to allow changing of any settings values. This<br />
safeguard is in addition to the settings passcode feature, which functions independently<br />
(see Passcode on page 5–8).<br />
Test Switch<br />
Once the <strong>469</strong> is in service, it may be tested from time to time as part of a regular<br />
maintenance schedule. The relay will have accumulated statistical information relating<br />
historically to starter and motor operation. This information includes: last trip data,<br />
demand data (if the metering features are in use), MWh and Mvarh metering, RTD<br />
maximums, the event record, analog input minimums and maximums, number of motor<br />
trips, number of trips by type, total motor running hours, learned parameters, number of<br />
starter operations, number of motor starts, number of emergency restarts, and the digital<br />
counter. Shorting the <strong>469</strong> Test input (terminals C3 and C4) prevents all of this data from<br />
being corrupted or updated when the relay is under test. The In Service LED will flash while<br />
the test terminals are shorted.<br />
Emergency Restart<br />
Shorting terminals D17 and D23 discharges the thermal capacity used to zero, sets any<br />
Starts/Hour Block lockout to zero, sets any Time Between Starts Block lockout to zero, and<br />
reset all Trips and Alarms so that a hot motor may be restarted. However, a Restart Block<br />
lockout will remain active (it may be used as a backspin timer) and any trip condition that<br />
remains (such as a hot RTD) will still cause a trip. Therefore, while the terminals are shorted,<br />
the Trip and Block output relays will remain in their normal non-operated state. In the<br />
event of a real emergency, the Emergency Restart terminals should remain shorted until<br />
the emergency is over. Also, while the Emergency Restart terminals are shorted, a Service<br />
Alarm message indicates any trips or blocks that are active. As the name implies, this<br />
feature should only be used in an emergency – using it otherwise defeats the purpose of<br />
the relay, namely, protecting the motor. Any Emergency Restart input transition from open<br />
to closed or closed to open is logged as an event.<br />
5–24 <strong>469</strong> MOTOR MANA<strong>GE</strong>MENT RELAY – INSTRUCTION MANUAL