Switching Device - GE 339 Instruction Manual

S2 SYSTEM SETUP

Switching device

6–54
HIGH SPEED SWITCH
Range: Off, Contact Input 1 to 10, Virtual Input 1 through 32, Logic element 1 through 16,
Remote Input 1 to 32
Default: Off
For use in two speed motor applications only, to monitor the high speed contactor
position. The status of this switch is used by the relay to select between the normal
settings used for low speed operation and the high speed settings, and to ensure that in
high speed operation the relay maintains running status when current draw is very low.
Use a form-a (normally open) auxiliary contact of the high speed (speed 2) contactor.
LOW SPEED SWITCH
Range: Off, Contact Input 1 to 10, Virtual Input 1 through 32, Logic element 1 through 16,
Remote Input 1 to 32
Default: Off
For use in two speed motor applications only, to monitor the low speed contactor
position. The status of this switch is used by the relay to ensure that in low speed
operation the relay maintains running status when current draw is very low. Use a form-
a (normally open) auxiliary contact of the low speed (speed 1) contactor.
52a CONTACT
Range: Disabled, Enabled
Default: Disabled
The 52a contact function is permanently assigned to contact input number 1. It in
single-speed applications, when enabled, closure of this contact informs the relay that
the motor is connected to the line (online) and therefore the motor is running. It is
recommended that this contact be connected to a form-a (normally open) auxiliary
contact of the breaker/contactor, to ensure the relay maintains running status when
motor current draw is very low. The 52b contact (see below) has the same function, and
is for use when only a form-b (normally closed) auxiliary contact is available.
In two-speed applications, this contact is intended for monitoring the circuit breaker
where there is a circuit breaker as well as a high speed contactor and a low speed
contactor. When enabled and closed, and when one of the contactors is closed, the
relay maintains running status even when the motor current is very small.
52b CONTACT
Range: Disabled, Enabled
Default: Disabled
The 52b contact function is permanently assigned to contact input 2. It performs the
same function as the 52a contact, but with a form-b (normally closed) rather than a
form-a (normally) auxiliary contact of the breaker/contactor.
If both 52a contact and 52b contact are enabled, the relay assumes the motor online if
the 52a contact is closed and the 52b contact is open.
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS