PGR-6150 Motor Protection System
Rev. 1
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Pub. PGR-6150-M. September 29, 2010 • www.littelfuse.com • © 2010 Littelfuse • POWR-GARD
®
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6. PGR-6150 PROTECTIVE FUNCTIONS AND CONTROL
6.1. Power Supply
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The PGR-6150 comes with a 110/240 Vac/dc, 5 W power supply.
The PGR-6150 generates 24 Vdc available through the RJ-45 port to supply auxiliary modules.
6.2. Protective Functions
6.2.1. General Settings
The equipment's general settings are as follows:
General Settings
Description
Mínimum Maximum Step
Unit
Default
Nominal current
I
B
4 25 0.01
A 4
CT turns ratio
1
2000
1
-
1
Frequency -
-
50Hz/60Hz/var
Hz
50
Motor start limit
1
8
0.01
X
I
B
1.5
Motor starting time
1
200
1
s
60
Phase sequence
-
-
ABC/ACB
-
ABC
PGR-6150 Initial time
0
3600
1
s
0
To protect the motor, the “Nominal current (I
B
)”, must be set to the value stated on the motor
nameplate.
If the “nominal current” is below the minimum relay current set-point value, pass cables through the
relay “n” time. “I
B
“ set value will be “I
N
x n”, where I
N
is the nominal current shown on the motor
nameplate.
If the “nominal current” is greater than the maximum relay current set-point range, use external current
transformers. “I
B
“ set-point value will be the nominal current shown on the motor nameplate
divided by the CT Turns Ratio.
The “motor start limit” and "motor starting time" settings are used to adjust motor start up limits. A trip
will result when this limit is exceeded.
,
NOTE:
For “Motor starting time” choose a value between 1 and 200. It is possible to
deactivate this function by setting the value to 0. A value 0f 0 is not recommended as it may
result in motor damage.
The frequency can be adjusted to 50 Hz, 60 Hz and variable frequency (with the equipment
maintaining measurement accuracy and time within a range of 45 Hz to 65 Hz). The variable
frequency setting applies to models with alternating supply voltage.
The “phase sequence” setting is set to match the phase rotation of the installation.
The “PGR-6150 initial time" is used to delay motor starting in applications where a staggered
start is required.
