14
2.7 PROGRAMMABLE CONTROLLER OUT-
PUT
In many installations an output of motor current into a program-
mable controller is desirable. Terminals 4 (+ VE) and 5 (-VE)
provide a DC output of 4-20mA proportional to motor current.
The 20mA output is obtained at the rated CT ratio. For exam-
ple, if a 600:5 CT is used, at 600 Amps the output would be
20mA. The output saturates below 30mA during overloads to
prevent damage to the programmable control.
2.8 TAMPER PROOF COVER
If limited access to the Protect 4A controls is desired to prevent
settings from being altered by operators, tamper proof screws
and a special installation tool can be ordered. The normal cover
screws are replaced with these special screws so that the cover
cannot be removed without the tool. The cover can also be ro-
tated 180 degrees and a plug placed over the reset button hole.
This prevents access to the reset button so that only qualified
personnel can reset the relay once it has tripped.
2.9 FIELD OPTIONS
It is possible to change some features on the relay in the field
for specific applications. Refer to the internal switch setting loca-
tion diagram fig. 2.9 to set the field options.
Summary of Contents for PROTECT 4A-120
Page 1: ...MOTOR PROTECTION RELAY INSTRUCTION MANUAL ...
Page 5: ...2 FIGURE1 1 PROTECT 4A TYPICAL SYSTEM CONNECTION ...
Page 11: ...8 FIGURE 2 2 PHASE CT DIMENSIONS FIGURE 2 3 GROUND FAULT CT DIMENSIONS ...
Page 21: ...18 FIGURE 3 1 FRONT PANEL LAYOUT ...
Page 35: ...32 FIGURE 4 1 SINGLE PHASE INJECTION TESTING FIGURE 4 2 100 AMP CURRENT SOURCE ...
Page 39: ...36 FIGURE 4 3 GROUND FAULT EARTH LEAKAGE TEST ...
Page 44: ...41 FIGURE 5 1 HARDWARE BLOCK DIAGRAM ...
