LOAD CONTROLS ROC-50 Setup guide

RO C-5 0 RATE O F CH AN G E LO AD CO N TRO L
INSTALLATIO N, SET UP AND ADJUSTMENT
Th e M o d e l RO C -5 0 m o n i to rs t h e t ru e p o w e r g o i n g t o a m o t o r.
By se nsing powe r (vo lts x amps x powe r fac to r) rathe r than just
amps, there is much greater sensitivity. It has two adjustable set
points.
Ra te - Li m it s s u d d e n i n c re a s e s i n l o a d re g a rd l e s s o f to t a l l o a d .
Max - Limits the total load.
MOUNTING
Wiring is done to un-pluggable terminal strips on the rear of the unit.
Th re e w a ys to m o u n t :
•Ondoororraceway-usecutouttemplate
•PanelMount-usetemplate+optionalBezelKit(NoCharge)
•Onwall-onstandardoutdoorjunctionbox+optional
Outlet Box Adapter (No Charge)
VO LTAGE
120 volts AC is taken from two of the phases. If the motor
starter already has a 120-volt control transformer with 10VA
of free capacity, it can be used. Otherwise, install a separate
transformer. It is okay if the secondary is grounded.
BE SURE TO NO TE WHICH TWO PHASES SUPPLY THE
TRAN SFO RM ER.
In 1 2 0 / 2 0 8 V thre e -p h ase syste m , t he 1 2 0 V MUST c o m e fro m a
transformer connected to two of the phases. The 120V phase to
ground voltage cannot be used.
CURRENT
Th e c u rre n t s ig n a l is t a ke n fro m t h e REMAIN IN G p h a s e .
Th is c u rre n t s a m p le p a s se s t h ro u g h t h e Ra n ge Fin d e r To ro id .
It is VERY IMPO RTANT that the current signal comes from the phase
that IS NOT supplying the 120V control transformer. Be extra careful
when the machine has reversing starters or multi-speed windings. If a
wrong phase is used the control will either:
•Workbackwards •Havereducedsensitivity
If yo u a re u sing a va ria b le fre q ue n c y d rive , u se a d iffe re n t co n tro l.
Call LOAD CONTRO LS, INC. for help.
LO A D C O N TRO LS
INC O RPO RATED
Call LOAD CONTROLS, INC for help.
ROC-50 RATE OF CHANGE LOAD CONTROL
INSTALLATION, SET UP AND ADJUSTMENT
MOUNTING
VOLTAGE
CURRENT

FU LL SCALE CAPACITY AT 4 6 0 VO LTS
Th e Ra n ge Fin d e r To ro id h a s s ix m o to r siz e c h o ic e s.
Se le ct o n e th at is e q ua l o r large r th an yo ur mo to r. Th is
will leave some headroom.
•
For motors less than 5 HP (460 volt), take extra turns.
•Formotorsgreaterthan50HP,useRangeFinder
To r o id + C u r r e n t Tr a n s fo r m e r.
MOTO R FULL % FULL RANGE TURNS CURRENT
SIZE SCALE LO AD FINDER TRANS-
CAPACITY SWITCH FORMER
1/2 HP .6 HP 123 2 ON 8
11.251232ON4
1-1/2 1.65 109 2 ON 3
22.701342ON2
33.801283ON2
55.501102ON1
7-1/2 8.25 110 3 ON 1
10 11.0 110 4 ON 1
15 27.5 183 5 ON 1
20 27.5 137 5 ON 1
25 27.5 110 5 ON 1
30 55.0 183 6 ON 1
40 55.0 138 6 ON 1
50 55.0 110 6 ON 1
60 84.0 140 1 ON 1 100:5
75 84.0 112 1 ON 1 100:5
100 130 130 1 ON 1 150:5
125 130 104 1 ON 1 150:5
150 173 115 1 ON 1 200:5
200 216 108 1 ON 1 250:5
250 260 104 1 ON 1 300:5
300 346 115 1 ON 1 400:5
MULTIPLIERS
Fo r n o m in a l vo lta ge s o the r t h an 4 6 0 vo lt s,
multiply 460V full scale by:
208V = .45
230V = .5
380V = .83
415V = .9
575V = 1.25
For Kilowatts multiply Full Scale HP x .746
Fo r m o to r siz e s o r c ap a c it ie s no t in ta b le :
% Full Load = Full Scale Capacityx 100
Yo u r M o t o r S i z e
+ -
4-20
MA OUTPUT
REMOTE RESET
REMOTE
RATE
RELAY OUTPUTS —
POWER ON, NOT TRIPPED
MAX
TRIP
RATE
TRIP
12345678 910111213141516
MOTOR
RANGE FINDER
TOROID
CURRENT FROM
REMAINING PHASE
VOLTAGE TRANSFORMER
WITH 120V SECONDARY
MAX
FULL SCALE CAPACITY AT 460 VOLTS
MULTIPLIERS

FO R MO TO RS LESS THAN 5 H P
Ta k e m o r e “ t u r n s ” o f t h e le g t h r o u g h t h e To r o id . Ea c h
time the wire passes through the Toroid is a “turn”.
This is o ne tu rn . This is tw o turn s.
FO R MO TO RS G REATER THAN 5 0 HP
A Cu rre nt Tra nsfo rm e r is u se d to re d uce the p rim ary
current. The 5-amp secondary passes through the Toroid.
Pass se c o n d ary o f CT th ro u gh to ro id .
CAUTIO N
Whe n current is flowing through the primary o f the
external current transformer, always have a wire be-
tween the two brass Terminals on the CT.
If they are le ft o pe n, dange ro us and de struc tive vo lt-
ages can develop.
RAN GE FIN D ER TO RO ID HOOKING UP THE RESET
Control can be reset three ways:
•
Manually with the Reset button on the control.
•Remotelywitharemotelylocatedresetbutton
or relay.
•Automaticwithajumper.
Re m o te Re se t-
Momentarily connect Terminal 4 to Terminal 6 for max.
Momentarily connect Terminal 5 to Terminal 6 for rate.
Auto ma tic Re se t-
Ju m p e r Te rm in a l 4 o r 5 to Te rm in a l 6 .
Th e t e rm in a ls fo r Re s e t g e n e ra te a sm a ll a m o u n t o f
current (8-12 milliamps). To reset, you just need to
connect the terminal to the circuit common (Terminal 6).
Th e s w it c h e s o r re la ys t h a t yo u u se m u st b e s u it a b le fo r
lo w c urre n t (G o ld fla she d co nta cts, Re e d Re lays, Me rcury
Switc he s).
4-20 MILLIAMP ANALOG OUTPUT
Th e An a lo g O u t p u t is d ire c t ly p ro p o r t io n a l t o Fu ll Sc a le
capacity. It is always active. 500 ohm maximum con-
nected impedance.
Te r m i n a l 2 4 -2 0 m A P o s i t ive
Te r m i n a l 3 4 -2 0 m A N e g a t ive
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.
TH E RO C -5 0 PO W ERS TH E 4 -2 0 M A S IG N AL.
DON’TUSEAN EXTERNALDC POWER SUPPLY.
SPECIFICATIO NS ROC-50
EN C LO S U RE
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 5 0 h o r s e p o w e r d ir e c t ly
through Toroid
To 5 0 0 h o r s e p o w e r w it h e x t e r n a l
Current Transformer & Toroid
DIGITALLOAD DISPLAY
.4” LED 3 Digit
RELAY O U TPU TS
(2) Form C 3 AMP @ 300 VAC or
1/8 HP @240 VAC
La t c h w h e n t r ip p e d
1 1/8” Hole
3 1/2”
2”
2 3/8”
ANALO G O U TPU T
4-20mA; powered by the
RO C -5 0 5 0 0 O H M
maximum connected
im pe d an ce
RESPO N SE TIME
25 Milliseconds
TEM P ER ATU RE
0ºC - 55ºC
TIM ERS
Sta rt-up a nd Trip De la y(s)
0-90 second
0-2 second in .1 second
inc re m e nts
2-90 second in 1 second
inc re m e nts
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 ROC-50 POWERS THE 4-20 MA SIGNAL
DON’T USE AN EXTERNAL DC POWER SUPPLY!
SPECIFICATIONS ROC-50
CAUTION

TO SET FULL SCALE
ï After hook-up, f ind your HP , KW or % fr om the chart.
ï Decide if y ou want to display HP, % or KW .
ï The c ycles through the choices sho wn below and
blinks slowly for each choice. Each pr ess of moves
you to the next choice.
FULL
SC ALE
FULL
SC ALE
FRONT P ANEL SET-UP TIPS
1) None of t he settings will be changed until you hold
down and the fast blinking stops.
2) Five seconds af ter you have pressed a button, the
Control will return to normal oper ation.
3) If you hold do wn the digits will continue to
change.
4) You only need t o do when you install the Contr ol
(or if y ou change the hook-up).
ENTER
FULL
SC ALE
DIGITS ÆDECIMAL ÆDECIMAL ÆDECIMAL ÆHP Æ%ÆKW
XXX. XX.X X.XX
to change if this is if this is if this is if this is if this is if this is
your choice, your choice, your choice, your choice, your choice, your choice,
press press press press press press
Ø Ø Ø Ø Ø Ø Ø
until fast until fast until fast until fast until fast until fast until fast
blink stops blink stops blink stops blink stops blink stops blink stops blink stops
ENTER ENTER ENTER ENTER ENTER ENTER ENTER
TO VIE W AND CHANGE TH E SET POINTS
AND DEL AY TIMES
c ycles through the choices. The LED f or each choice
will turn ON.
To change a setting, use
Press ENTER until quick blinking s tops to store your new
choice.
After 5 seconds if y ou havenít pressed any buttons,
control will return to normal oper ation.
Start-up Timer
The Start-up Timer bypases the Control during motor
start-up to avoid false trips because of curr ent inrush. For
convenience, the TIMING BEGINS WHEN THE MO TO R
STARTS. The S tart-up LED stays lit until the start-up period
is over.
The start-up time should be:
ï Long enough so that the load has s tabilized.
To bypass Start-up Timer set time to zer o seconds.
Dela y Timer (Max Set P oint)
To avoid nuisance trips fr om short overloads, Dela y
Timers bypass the Contr ol for the select ed time. The
relays wonít trip until the time is exceeded. If t he trip
condition goes away before the time is up, the timer
resets to zer o.
ï Start with minimum Dela y. If y ou are getting trips
where you donít w ant them, increase the Dela y
Time.
Adjusting R ate Set P oint
The Rate Set P oint limits sudden load changes.
1 = Fastest (most sensitive)
40 = Slo west (least sensitive)
Start at about 15. Go slo wer if you get nuisance trips. Go
faster for more sensitivity.
888-600-3247
10 PICKER ROAD 508-347-2606
STURBRIDGE, MA 01566 FAX [phone]
11/2001
53 TEC HN O LO G Y PARK RO AD
STURBRIDG E, M A 01566
888-600-3247
508-347-2606
FAX [phone]
• After hook-up, find your HP, KW or % from the chart
• Decide if you want to display HP, % or KW
•
shown
press
FRONT PANEL SET-UP TIPS
None of the settings will be changed until you hold
Five seconds after you have pressed a button, the
Control will return to normal operation.
(or if you change the hook-up).
TO VIEW AND CHANGE THE SET POINTS
AND DELAY TIMES
cycles through the choices. The LED for each choice
Press ENTER until quick blinking stops to store your new
choice.
After 5 seconds if you haven’t pressed any buttons,
control will return to normal operation.
Start-up Timer
The Start-up Timer bypasses the Control during motor
start-up to avoid false trips because of current inrush. For
convenience, the TIMING BEGINS WHEN THE MOTOR
STARTS. The Start-up LED stays lit until the start-up
period is over.
The start-up time should be:
• Long enough so that the load has stabilized
To bypass Start-up Timer set time to zero seconds
Delay Timers (Max Set Point)
To avoid nuisance trips from short overloads, Delay
Timers bypass the Control for the selected time. The
relays won’t trip until the time is exceeded. If the trip
condition goes away before the time is up, the timer
resets to zero.
• Start with minimum Delay. If you are getting
trips where you don’t want them, increase the Delay
Time.
Adjusting Rate Set Point
The Rate Set Point limits sudden load changes
1 = Fastest (most sensitive)
40 = Slowest (least sensitive)
Start at about 15. Go ‘slower’ if you get nuisance trips. Go
‘faster’ for more sensitivity.
will turn ON.
10/2015