PFR-1750 LOAD CONTROL
INSTALLATION, SET UP AND ADJUSTMENT
The Model PFR-1750 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. The unit has two adjust-
able trip points.
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.
PFR-1750 LOAD CONTROL
INSTALLATION, SET UP AND ADJUSTMENT
MOUNTING
VOLTAGE
CURRENT
