ROC-50 RATE OF CHANGE LOAD CONTROL
INSTALLATION, SET UP AND ADJUSTMENT
The Model ROC-50 monitors the true power going to a motor.
By sensing power (volts x amps x power factor) rather than just
amps, there is much greater sensitivity. It has two adjustable set
points.
Rate - Limits sudden increases in load regardless of total load.
Max - Limits the total load.
MOUNTING
Wiring is done to un-pluggable terminal strips on the rear of the unit.
Three ways to mount:
•
O n door or raceway - use cutout template
•
Panel Mount - use te optional Bezel Kit (No Charge)
•
O n wall - on standard outdoor junction box + optional
O utlet Box Adapter (No Charge)
VOLTAGE
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. O therwise, install a separate
transformer. It is okay if the secondary is grounded.
BE SURE TO NO TE WHICH TWO PHASES SUPPLY THE
TRANSFO RMER.
In 120/ 208V three-phase system, the 120V MUST come from a
transformer connected to two of the phases. The 120V phase to
ground voltage cannot be used.
CURRENT
The current signal is taken from the REMAINING phase.
This current sample passes through the Range Finder Toroid.
It is VERY IMPO RTANT that the current signal comes from the phase
that IS NO T 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:
•
Work backwards
•
Have reduced sensitivity
If you are using a variable frequency drive, use a different control.
Call LOAD CO NTRO LS, INC. for help.
LOAD CONTROLS
INCORPORATED
Call LOAD CONTROLS, INC for help.
ROC-50 RATE OF CHANGE
LOAD CONTROL
INSTALLATION, SET UP AND ADJUSTMENT
MOUNTING
VOLTAGE
CURRENT
