CHAPTER 4: SETPOINTS CONTROL
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–343
Figure 4-148: Reduced Voltage Start Current Characteristic
NOTE:
If this feature is used, the Starter Status Switch input must be either from a common
control contact or a parallel combination of Auxiliary ‘52a’ contacts or a 1series
combination of Auxiliary ‘52b’ contacts from the reduced voltage contactor and the full
voltage contactor as shown in the diagram, Reduced Voltage Starting wiring example.
Figure 4-149: Reduced Voltage Starting wiring example
Path: Setpoints > Control > Motor Starting > Reduced Voltage Start
FUNCTION
Range: Disabled, Trip, Configurable
Default: Disabled
CONTROL OUTPUT RELAY X
For details see Common Setpoints
.
TRANSITION MODE
Range: Current Only, Current or Timer, Current and Timer
Default: Current Only
“Current Only”: When the motor load falls below the Start Current Level setting prior to
the expiration of the Start Timer, a transition will be initiated by asserting the Reduced
Volt Ctrl operand for a period of one second. Any contact output assigned to this
8940$1.cdr
MOTOR
AMPS
(% FLA)
When the currrent falls below
the Transition Level and/or the
Timer expires, the Auxiliary
Relay activates for 1 second
Transition Time
TIME
signifies
Open Transition
3 x FLA
Transition
Level
FLA
8940$1.cdr
F13
F14
F15
F16
F17
F18
F19
F20
DIGITAL INPUTS
DIGITAL INPUT 1
DIGITAL INPUT 2
DIGITAL INPUT 3
DIGITAL INPUT 4
DIGITAL INPUT 5
DIGITAL INPUT 6
DIGITAL INPUT 7
COMMON
SLOT F : I/O_A
F21 +24 V
REDUCED VOLTAGE START
APPLICATION
TRIP
CLOSE/AUX
START INHIBIT
AUXILIARY
CRITICAL
FAILURE
RELAY
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
F22
F23
F24
V
V
OUTP UT REL AYS
F1
F2
CC 2- 2
Typical auxiliary
contacts connection
CC2
CC2-1
+
CC1
-
869
STOP
START
CC1-1
52a
52b
CC 1-2
CC 1-2 CC 2-2
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