Model 5210-2 Power Supply
1.0
Introduction
The Model 5210-2 is a current-regulated power supply and display that is designed for use with
Magtrol’s Dial Weight Dynamometers. With regulated current, torque drift caused by temperature
changes within the brake coil is eliminated.
The 5210 is a solid-state control that provides smooth application of current from zero to maximum.
Braking power can be controlled manually from either the 10-turn potentiometer and adjustment
knob on the front panel, or externally from the 0–5 V DC input when remote operation is desired.
An LCD readout conveniently displays the applied braking current.
1.1
Note:
Magtrol offers three different models of the 5210 Power Supply,
each with a different maximum voltage output. The 5210-1 is 90
volts, 5210-2 is 24 volts, and the 5210-3 is 12 volts. All Magtrol
Dial Weight Dynamometers are designed with a 24 volt coil.
Therefore, the 5210-2 is the only power supply that should be used
with a dial weight dynamometer. The 5210-1 and 5210-3 are for
use with Magtrol brakes and clutches only.
Specifications
Brake Voltage
CURRENT RANGES:
Low Scale
Medium Scale
High Scale
Current Regulation
0 to 24 V DC
Braking Control
Brake Fuse (5 × 20 mm)
Line Fuse (5 × 20 mm)
Power Requirements
Voltage Requirements
1
0 to 200 mA
0 to 500 mA
0 to 1000 mA
± 1% Full Scale
10-turn potentiometer (internal) or
0–5 V DC input (external)
UL/CSA 1.25 A 250 V SB
IEC
1.00 A 250 V T
120 V: UL/CSA 1.0 A 250 V SB
240 V: IEC
0.4 A 250 V T
100 VA
120/240 V AC 50/60 Hz
User’s Manual
Magtrol Model 5210-2 Power Supply
1.2
Front and Rear Panel
1.3
Circuit Description
Functionally, the circuit is a closed loop, current feedback amplifier regulating the output current at
the value set by the front panel controls.
DC current from the internal 35 volt power supply passes through the dynamometer coil connected
at the BRAKE connector J6, through the insulated gate field effect transistor Q1 (HEXFET), and
through a current sense resistor R13, R14 or R15 (selected by the RANGE control). The voltage
drop across the current sense resistor is amplified by Operational Amplifier U1b and applied to the
non-inverting differential input of Operational Amplifier U1a. Amplifier U1a amplifies the difference
between the conditioned current signal from the sense resistor and the voltage from the front panel
current ADJUST potentiometer, R6. This amplified error voltage is applied to the gate of transistor
Q1 to control its channel resistance and thereby regulates the output current at the value set by the
ADJUST control.
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User’s Manual
Magtrol Model 5210-2 Power Supply
2.0
Configuration
2.1
Input Power
The 5210-2 is shipped set for 120 Vrms power. This can be verified by observing the location of the
round white tab in the fuse holder of the power line filter module that is located on the rear panel
- it should show through the 120 V hole.
2.1.1
Setting Line Power to 240 V
1. Remove the line cord.
2. Remove the fuse holder to access the inner module.
3. Remove the small circuit board with the white tab.
4. Rotate and reposition the white tab so that when the board and fuse holder are reinserted,
the round point of the white tab now inserts into the small round hole on the fuse holder
that is opposite the 240 V position.
2.2
Note:
Of the four (4) voltage positions shown on the fuse holder, only
the 120 V and the 240 V positions are active. Selecting either the
100 V or the 220 V position will not apply line power to the power
supply. Therefore, use only the 120 V or 240 V positions.
External Control Input
An EXTERNAL CONTROL input is provided at the rear of the 5210-2 to adjust the dynamometer
current from an external 0 to + 5.0 VDC input. This input is scaled for 5.0 VDC and equals the full
scale output current of each current range (0.2, 0.5 and 1.0 amp).
When this connector is plugged in, the front panel ADJUST control is nonfunctional.
3.0
Operation
The 5210‑2 is universal for all Magtrol Dial Weight Dynamometers. However, because of the wide
range of full scale current requirements; 0 to 0.164 amps (HD‑106‑1) to 0 to 0.700 amps (HD‑705‑1),
a three position current range control provides improved torque resolution control. The three settings,
HIGH, MED and LOW determine the full scale current level of the power supply. Full scale for
the HIGH, MED and LOW ranges are 1.0, 0.5 and 0.2 amps, respectively. The digital panel meter
indicates the current output level to within ± 1%.
Starting on the LOW current range, with the ADJUST knob set fully counter clockwise (zero
current), increase (INC) current until the desired torque is obtained. Select the next higher RANGE
as necessary to obtain this torque.
3
User’s Manual
Magtrol Model 5210-2 Power Supply
Appendix A: Schematic
S
Q1
D
R25
G
IRF740
1 3W
CR6
1N6295A
C6
.001
CR5
1N4745
R9
C9
200
47 pF
C8
.001
R23
J5
EXTERNAL
CONTROL
INPUT
BRAKE
J6
C10
.001
P2
5
4
3
2
1
J2
5
4
3
2
1
10k
35V
R5
SW2b
HIGH
MED
LOW
SW2a
RANGE
SHOWN HIGH POSITION
P4
10
9
8
7
6
5
4
3
2
1
J4
10
9
8
7
6
5
4
3
2
1
.1
R10
R4
499
1k
+
C4
1
R3
1.5k
CR3
1N821A
8
IN 7
IN +
6
DP 3
3
DP COM
2
GND
1
V+
DP-650
PM1
AC INPUT
P5
J
L
H
LINE
K
GND B
E
NEU
D
F
G
6VM2
P3
10
9
8
7
6
5
4
3
2
1
J3
10
9
8
7
6
5
4
3
2
1
P1
B
E
D
F
G
J1
B
E
D
F
G
R8
10k
1.5k
R22
R14
2
3W
CR8
1N4148
2.49k
R11
500
.2A CAL
R13
5
1W
9.09K
6
7
5
CR9
+
U1b
1N4148
R12
15V
R15
1
3W
1k
R19
2.0k
R16
90.9k
1k
1A CAL
M1
C7
CR7
1N5060
5V CALIBRATE
ADJUST
3
2
R6
5k
1
10M
LM358A
2
1
3
+
U1a
CR4
1N4735A
R7
R21
.5A CAL
R18
8.45k
R17
9.53k
R20
ON-OFF
SW1
T1
CHASSIS
4
5
3
6
PE05
2
35V
BR1
7
R24
5.1K
+
CR1
LM340T15
R1
+
C1
1N5060 560
1000
1
8
LP56-850
C2
1
VR1
15V
+
C3
1
R2
1.5k
CR2
1N751A
15V
8
U1
4
+
C5
1
1st Edition rev A – May 2010
Testing, Measurement and Control of Torque-Speed-Power • Load-Force-Weight • Tension • Displacement
Magtrol Inc
70 Gardenville Parkway
Buffalo, New York 14224 USA
Phone: +1 716 668 5555
Fax: +1 716 668 8705
E-mail: magtrol@magtrol.com
Magtrol SA
Route de Montena 77
1728 Rossens / Fribourg, Switzerland
Phone: +41 (0)26 407 3000
Fax: +41 (0)26 407 3001
E-mail: magtrol@magtrol.ch
4
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