GE 339 Instruction Manual page 272

S4 CONTROLS
6–138
Figure 6-56: Start Inhibit, Starts per Hour, Time Between Starts, and Restart Inhibit
logic diagram
MOTOR STATUS
Running
Starting
Clk
In
ACTUAL VALUE
Thermal Capacity Used
COMMA D
Clear Learned TCU
SETTI G
m = Thermal Inhibit
setting = OFF
setting = 0%
TC
in
Tc + m/100 x Tc
in in
*saturates at 100%
I
I
avg
> Current Cutoff Level
avg
LOGIC OPERA D
THERMAL INHIBIT
STARTS/HR INHIBIT
TIME-BTWN-STARTS INHIBIT
OR
RESTART INHIBIT
FUSE FAIL INHIBIT
PH REVERSAL INHIBIT
Edge Triggered
Sample & Holds
(Non-Volatile)
-
Clk Clk Clk
In In In
+
Preset Preset
Presets latches to 85%
TC
learned
85%
TCU
TC
SETTI G
Starts/Hour Limit
STARTS/HOUR COUNTER
setting = OFF
Counter setting ≥
SETTI G
t = Time Between Starts
do
setting = OFF
0
t
do
SETTI G
t = Restart Inhibit
do
setting = OFF
0
t
do
LED: Start Inhibit
Operate Output Relay 3 (Start Inhibit)
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
Clk Clk
In In
Preset Preset Preset
Select
Largest
Value
LOGIC OPERA D
THERMAL INHIBIT
AND
> 100% - TCU
learned
ACTUAL VALUE
Learned TCU
THERMAL INHIBIT
LOGIC OPERA D
STARTS/HR INHIBIT
AND
ACTUAL VALUE
STARTS/HR INHIBIT
LOGIC OPERA D
TIME-BTWN-STARTS INHIBIT
AND
ACTUAL VALUE
TIME-BTWN-STARTS INHIBIT
LOGIC OPERA D
RESTART INHIBIT
AND
ACTUAL VALUE
RESTART INHIBIT
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