GE 239, Instruction Manual

Page: 71 / 158

GE Multilin 239 Motor Protection Relay 4-33
4 PROGRAMMING 4 PROGRAMMING
4
4.7 SWITCH INPUTS
a) OPTION SWITCH 1-2
• OPTION SWITCH 1-2 NAME: A 20 character name can be assigned to the option switch inputs.
See Section 4.2e) PROGRAMMABLE MESSAGE on page 4–7 to learn how to enter the switch
names. This name will appear in the following messages.
• OPTION SWITCH 1-2 FUNCTION: The two option switch inputs are identical in operation. These
can be programmed to alarm, trip, energize the auxiliary relay for process control, select alter-
nate setpoints upon detection of closure, or disable starts upon detection of closure in conjunc-
tion with the
',6$%/(67$576
setpoint described in Section 4.3b) MOTOR DATA on page 4–10. In
some applications start protection may not be required. Therefore, by setting this setpoint to
<(6
,
the start protection on the 239 can be defeated. If the setpoint is set to
<(6
, the 239 will go
directly into run condition and overload curves will be employed to protect the connected load.
• OPTION SWITCH 1-2 DELAY: A delay of 0.0 to 60.0 seconds is programmed here. The switch
must remain closed for the programmed length of time in order for the 239 to detect the condi-
tion. If the switches are not used then they should be set to off in
6 3527(&7,21? 6:,7&+
,13876?237,216:,7&+?237,216:,7&+)81&7,21
.
• OPTION SWITCH 1-2 ALTERNATE SETPOINTS: see Section 4.8: MULTI-SPEED MOTOR
below.
4.8 MULTI-SPEED MOTOR
The 239 has a multi-speed motor feature. This feature is intended to provide proper protection for a
two, three, or four-speed motor where there will be different full motor characteristics (based upon
speed settings). The algorithm integrates the heating at each speed into one thermal model using a
common, thermal capacity used register for all speeds.
If the two-speed motor feature is used, OPTION SWITCH 1 and/or OPTION SWITCH 2 will be dedi-
cated as the two-speed motor. Terminals 41 and 46 (and/or 42 and 47) will be monitored for a con-
tact closure – closure of the contact will signify that the motor is in Speed 2. If the input is open, it
signifies that the motor is in Speed 1. This allows the 239 to determine which setpoints should be
active at any given point in time.
• OPTION SWITCH 1-2 ALTERNATE SETPOINTS: The alternate setpoints only appear if the
237,216:,7&+)81&7,21
is set to
$/7(51$7(6(732,176
. As shown in the table below, there are six
alternate setpoints that are divided into 3 sets. The following table shows the conditions required
to select the appropriate set of alternate setpoints.