GE Multilin SR469-P5-HI-A20-E Motor Management Relay

Product Description.

The SR469-P5-HI-A20-E from GE Multilin is part of the SR 469 motor management relay circuit.

This unit is designed with a 5 amp phase CT secondary winding.The SR 469 relay is designed for use with medium voltage motors and provides integrated management and protection.

AX Control maintains an existing inventory of several different Multilin SR 469 relays.

The SR 469-P5-HI-A20-E provides 70-265 VAC, 90-300 VDC control power. The unit has an enhanced front panel.

The SR469-P5-HI-A20-E has a well-designed front panel that is easy to use. The panel includes an RS-232 programme port interface with a 9600 baud rate, programmable to 19200 baud rate.

The panel has a sealable pull-out handle to prevent any unauthorised removal. The front panel has a large 40 character LCD display.

This display allows the user to view diagnostic messages such as trips or alarms locally.

In addition, the panel features motor and output status indicators, device indicators, a numeric keypad, control and programming keys including reset, exit, and menu buttons, and value keys that allow the user to change setpoints.

Frequently Asked Questions about the SR469-P5-HI-A20-E

What measures should be taken for unbalanced bias in the thermal capacity and bias K-factor of the GE SR469-P5-HI-A20-E motor management relay?

The GE SR469-P5-HI-A20-E Motor Management Relay has an unscheduled bias in thermal capacity and should be enabled for thermal capacity use in

so that the heating effect of the unbalanced bias current is added to the thermal capacity.

For the unbalance bias K-factor, the value is calculated by the contribution of the negative current flowing in the rotor due to the unbalance of the K-factor.

There is a formula based on empirical data statistics for the letter ‘K’ which is equal to 230 divided by the square of the unit locked rotor current. Locked rotor current = 631% FLA or 6.31 times FLA.

What is the hot/cold curve ratio for this relay SR469-P5-HI-A20-E?

By using the data sheet for the SR469-P5-HI-A20-E relay, the safe stall hot time to cold time curve ratio is set to 16/18. which equals 0.89.

The hot curve to cold curve ratio is simply calculated by dividing the hot safe stall time by the cold safe stall speed, or you can use the motor thermal limit curve.

What is the maximum resistance temperature detector bias rating for the SR469-P5-HI-A20-E relay?

The maximum bias rating of the resistance temperature detector is set at the insulation rating or a slightly lower setting.

In order to set the maximum bias of the resistance temperature detector to Class F insulation, the motor should be rated at 155 degrees Celsius.