FOR MOTORS LESS THAN 5 HP
Take more “turns” of the leg through the Toroid. Each
time the wire passes through the Toroid is a “turn”.
This is one turn.
This is two turns.
FOR MOTORS GREATER THAN 50 HP
A Current Transformer is used to reduce the primary
current. The 5-amp secondary passes through the Toroid.
Pass secondary of CT through toroid.
CAUTION
When current is flowing through the primary of the
external current transformer, always have a wire be-
tween the two brass Terminals on the CT.
If they are left open, dangerous and destructive volt-
ages can develop.
RANGE FINDER TOROID
HOOKING UP THE RESET
Control can be reset three ways:
• Manually with the Reset button on the control.
• Remotely with a remotely located reset button
or relay.
• Automatic with a jumper.
Remote Reset-
Momentarily connect Terminal 4 to Terminal 6 for max.
Momentarily connect Terminal 5 to Terminal 6 for rate.
Automatic Reset-
Jumper Terminal 4 or 5 to Terminal 6.
The terminals for Reset generate a small amount of
current (8-12 milliamps). To reset, you just need to
connect the terminal to the circuit common (Terminal 6).
The switches or relays that you use must be suitable for
low current (Gold flashed contacts, Reed Relays, Mercury
Switches).
4-20 MILLIAMP ANALOG OUTPUT
The Analog O utput is directly proportional to Full Scale
capacity. It is always active. 500 ohm maximum con-
nected impedance.
Terminal 2
4-20mA
Positive
Terminal 3
4-20mA
Negative
Use twisted pair or in noisy environments, use shielded
cable. Ground shield at other end.
Use the Full Scale capacity from the chart to scale
external meter, chart recorders or computers.
THE ROC-50 POWERS THE 4-20MA SIGNAL.
DON’T USE AN EXTERNAL DC POWER SUPPLY.
SPECIFICATIONS ROC-50
ENCLOSURE
Glass-filled Polycarbonate
NEMA 4, 4X - STYLE
(3 1/ 4” x 6 1/ 4” x 2”)
(83 mm x 160 mm x 54 mm)
CAPACITY
To 50 horsepower directly
through Toroid
To 500 horsepower with external
Current Transformer & Toroid
DIGITAL LOAD DISPLAY
.4” LED 3 Digit
RELAY OUTPUTS
(2) Form C 3 AMP @ 300 VAC or
1/ 8 HP @ 240 VAC
Latch when tripped
1 1/ 8” Hole
3 1/ 2”
2”
2 3/
8”
ANALOG OUTPUT
4-20mA; powered by the
RO C-50 500 O HM
maximum connected
impedance
RESPONSE TIME
25 Milliseconds
TEMPERATURE
0ºC - 55ºC
TIMERS
Start-up and Trip Delay(s)
0-90 second
0-2 second in .1 second
increments
2-90 second in 1 second
increments
RANGE FINDER TOROID
HOOKING UP THE RESET
FOR MOTORS LESS THAN 5
HP
FOR MOTORS GREATER THAN 50
HP
4-20 MILLIAMP ANALOG OUTPUT
THE R
OC
-50 POWERS THE 4-20 MA SIGNAL
DON’T USE AN EXTERNAL DC POWER SUPPLY!
SPECIFICATIONS ROC-50
CAUTION
