CONFIGURA TION 199
13.13.4.1 50 % / 100 % rating select
The burden resistors AND a selection jumper are on the po wer board to the right of the 8 way terminal block.
The left hand position of the jumper sets the actual burden resistance to t wice the standard value and hence
reduces the model rating to 50 %.
(Higher burden values give lower model ratings).
Using this with DRIVE PERSONALITY / 680)Iarm BURDEN OHMS provides a 6 - 1 calibration range.
To measure the actual burden resistance use an ohmmeter across the pad marke d I and the right hand end of
the front resistor (R103) 0V. The pad marked I is a square pad adjacent to terminal 48.
The jumper has a third operating mode. If the jumper is parked on one pin, then the actual burden resistance
wil l be high to allow the use of small test motors.
Model Left hand jumper position Right hand jumper position Parked jumper position Amps
and A ctual Burden Ohms
PL/X 5 - 50 5 0% of max model rating 100 % of max model rating 6 A mps max 330R
PL/X 65 - 14 5 50 % of max model rating 100 % of max model rating 24 Amps max 82R
PL/X 1 85 - 2 65 50 % of max model rating 100 % of max model rating 24 Amps max 15 0R
See also 4.5.4 PASSIVE M OT OR defaults / Using passive motor menu for small test motors.
This is used to test small motors without changing the actual burden resistor value.
Note. When using the parked position for small test motors, you may choose to set CONFIGURA TION /
DRIVE PERSON ALITY / 6 80)Iarm BURDEN OHMS to the parked value, or leave it at the prevailing model
rating. If you set it to the parked value in the normal way, then the armature current calibration range of the
PL/X will reflect the parked position for small motors. If you leave it set to the prevailing model rating then
the PL/X parameters will assume the normal full ratings despite the actual current being scaled to the parked
position range for small motors. This may be useful if the configuration involves armature current related
parameters that need testing at full value despite the fact that only a small current is flowing.
E.g. A PLX50 is calibrated for 110 Amps. The jumper is parked, and a 6 Amp motor is used to test the unit
without altering 680)Iarm BURDEN OH MS. A t 1 00 % current, 6 Amps will be flowing in the armature, but
110 Amps will be displayed on 135)ARM CUR A MPS MON.
Table of burden resistor values for models with jumper selection.
R104 = 6A or 24 Amp depending on model, R103 // R1 02 // R104 = 50%, R101 // R100 // R104 = 100 %.
Amps Theoretical Burden (Rt)
Also 680)Iarm BURDEN
OHMS
100% or 50%
Fixed as show n
for small motors
R104 ohms
R103 // R102 // R104
50 %
1% 0.6W
R103 // R102 ohms
R101 // R100 // R104
100%
1% 0.6W
R101 // R101 ohms
12
166.66
319.95 6Amps / 330 10,500 // empty 680 // 680
24
83.33
167.46 6Amps / 330 680 // 680 220 // 220
36
55.55
110.44 6Amps / 330 332 // 332 66.5 // empty
51
39.21
78.21 6 A mps / 330 205 // 205 88.7 // 88.7
72
27.77
55.35 6 A mps / 330 66.5 // empty 60.4 // 60.4
99
20.20
40.68 6 A mps / 330 46.4 // empty 43 // 43
123
16.26
32.46 6 A mps / 330 36 // empty 34 // 34
155
12.90
25.68 24 Amps / 82 37.4 // empty 30.1 // 30.1
205
9.75
19.48 24 Amps / 82 51.1 // 51.1 22.1 // 22.1
270
7.41
14.76 24 Amps / 82 36 // 36 16.2 // 16.2
330
6.06
11.96 24 Amps / 82 28 // 28 13 // 13
430
9.30
18.50 24 Amps / 150 42.2 // 42.2 19.6 // 19.6
530
7.54
14.95 24 Amps / 150 33.2 // 33.2 15.8 // 15.8
630
6.35
12.55 24 Amps / 150 27.4 // 27.4 13.3 // 13.3
See 13.13.4 DRIVE PERSONALITY / Armature current burden resistance PIN 680 for burden formula.
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