3.1. Inspection¶
Carefully unpack the MagnaDC power supply and accessories saving all packing materials and included enclosures. Inspect the product for possible shipping damage. Check that there are no broken knobs or connectors, the external surface is not scratched or dented, the meter faces are not damaged, and all controls move freely. Any external damage may be an indication of internal damage. If there is any damage, notify the shipping carrier and Magna-Power immediately.
The following parts are included with all MagnaDC power supply models:
SLx Series MagnaDC power supply
Qty (2) rear support rack mounting brackets (Item 36120)
SLx Series hardware pack
Qty (9) PTH-10-32-0.500 (#10-32 x 1/2”), TC Screw for front and rear support ears (Item 17054)
Qty (5) NF-10-0.437 Washer for rear support ears (Item 15638)
Qty (5) PPNH-08-32-0.500, SEMS Screw for rear support rails (Item 37170)
Qty (5) F-08-0.380 Washer for rear support rails (Item 12137)
Qty (4) PPNH-06-32-0.380, SEMS Screw for DC output cover (Item 25478)
Qty (4) F-06-0.380 Washer for DC output cover (Item 12136)
Qty (5) PFH-08-32-0.500, SS, WC Screw for front panel handles (Item 13790)
Qty (2) Front panel handles 1.25” center, 0.25” wide, with mating hardware (Item 22015)
Protective cover for DC output terminals (Item 35140)
Phoenix Contact, female connector for AC input
Models with 1-phase UI or UI2 AC input: Phoenix Contact 1777846 (Item 36803)
Models with 3-phase AC input, except 10 kW models with 208/240 Vac input: Phoenix Contact 1777859 (Item 35239)
10 kW Models with 3-phase 208/240 AC input: Phoenix Contact 1967472 (Item 35328)
Calibration Certificate with Declaration of Conformity
3.2. Rack Installation¶
All SLx Series MagnaDC power supply models are intended for rack-mount installation, designed to fit in a standard 19” EIA-310-D equipment racks. When installing into a rack, both front and rear support is required. Fixed rear support rails are provided, which can be adjusted at time of installation to fit a variety of equipment rack depths, up to 32” (81.3 cm) from front vertical rack rail to rear vertical rack rail. These included support rails are designed to mate to inserts on the SLx Series MagnaDC power supply side panels using included hardware.
Fig. 3.1 Included rear support rails for the SLx Series¶
Note
Mechanical supports and cooling airflow for the SLx Series MagnaDC power supply are designed for horizontal installation only. Alternative mounting orientations are not recommended.
The following steps, which reference Fig. 3.2, should be followed when installing SLx Series MagnaDC power supply products into a rack:
Install 8 clip nuts on the rack frame (not provided). There are 4 front support locations and 4 rear support locations.
Secure the rear rails in the back of the rack by securing the rear rail mounting ears to the rear clip nuts using the #10-32 x 1/2” screws (Item 17054); 4 total.
While supporting the MagnaDC power supply, secure the rear side panel mounting holes to the fixed rear rails using the #8-32 x 1/2” screws (Item 37170) with the #8 3/8” flat washers (Item 12137); 4 total.
While supporting the MagnaDC power supply, secure the front ears to front of the rack by securing front mounting ears to the front clip nuts using the #10-32 x 1/2” screws (Item 17054); 4 total.
Make necessary AC and DC power connections (see below) and attach DC output cover by attaching #6-32 x 3/8” screws (Item 13790) with #8 3/8” washers (Item 12136); 3 total.
Fig. 3.2 Rack mount installation diagram for the SLx Series¶
3.2.1. Cooling Requirements¶
The SLx Series MagnaDC power supply features integrated fans that pull cool air in from the sides and exhausts warm air from the rear. This airflow allows two or more SLx Series MagnaDC power supply to be stacked without any vertical clearance required and to avoid pulling in polluntants from the room with suitable air filtration or conditioning on the equipment rack’s air intake. Equipment racks should be equipped with fans or blowers to remove heat generated by the power supplies. Equipment racks housing the SLx Series MagnaDC power supply should be equipped with either an open back, back with grills, or closed back with cabinet fans to remove heat generated by the SLx Series MagnaDC power supply. Magna-Power recommends fresh air intake at the bottom of the cabinet and exhaust fans at the top pulling air out of the cabinet.
For cabinet fans to be effective, the ambient intake air temperature outside the rack must be less than the air temperature inside the rack. The SLx Series MagnaDC power supply is rated for 50°C ambient operating temperature. In the case of rack installation, this corresponds to the temperature inside the rack and adequate cooling measures must be taken to ensure the rack’s internal temperature stays below 50°C.
The following table provides Magna-Power’s recommended per unit cabinet air flow when installing the SLx Series MagnaDC power supply in a fully enclosed cabinet, with example room temperatures at 25°C and 40°C:
SLx Series Model Power Level |
Maximum Heat Produced |
Recommended Cabinet Air Flow
77 °F (25 °C) Room Temperature
|
Recommended Cabinet Air Flow
104 °F (40 °C) Room Temperature
|
|---|---|---|---|
1.5 kW |
0.5 kBTU/hr |
15 CFM |
35 CFM |
2.6 kW |
0.9 kBTU/hr |
25 CFM |
65 CFM |
4 kW |
1.4 kBTU/hr |
25 CFM |
80 CFM |
6 kW |
2.1 kBTU/hr |
50 CFM |
120 CFM |
8 kW |
2.7 kBTU/hr |
65 CFM |
160 CFM |
10 kW |
3.4 kBTU/hr |
80 CFM |
200 CFM |
Note
The table above accounts for only a single product at each respective power level. When sizing cabinet fans, it is necessary to account for the heat produced by all the products in the cabinet.
Caution
Do not block the air intake on the sides of the product, nor the exhaust at the rear of the product. Blocking these vents could cause the product to overheat. The recommended minimum clearances are 2 inches (5.1 cm) along the sides and back.
Note
The product is equipped with thermocouples to monitor temperatures inside the product. In the event internal temperatures are exceeded due to excessive internal temperature, the product will shutdown and an over-temperature fault will be displayed.
3.3. AC Input Connection¶
Warning
Before attempting any installation or decommissioning procedure, disconnect AC power from the mains and ensure 0 Vac is measured from the AC input terminals to ground.
The SLx Series MagnaDC power supply uses a Phoenix Contact internal header and a provided Phoenix Contact mating connector to create a secure and finger-safe AC connection to the product. The SLx Series MagnaDC power supply is phase orientation insensitive, allowing the phases to be connected in any order. The ground connection must be connected to the position labeled with a ground symbol; ground is the rightmost connection on the AC input header.
Note
Products with a three phase AC input require all three phases to operate. These products cannot be operated with a single phase connection.
Warning
Never attempt to operate the product without a ground connection. Not connecting the ground is a safety hazard and could result in injury or death.
Magna-Power recommends AC cables sizes in accordance with the recommendations of the National Electrical Code or Suggested Ampacities of 4-Conductor Type S or SO Cable.
Note
The cable recommendations provided are for reference purposes only. Always consult local electrical code requirements to ensure compliance.
The AC wire should be stripped of 0.4” (10 mm) of insulation. The mating connector uses a Philips screw to secure the wire to the connector. After inserting each stripped wire into the connector, the corresponding Philips screw should be tightened to a torque of 0.5 Nm to 0.8 Nm.
After all AC input wires and the ground wire have been secured to the mating connector, insert the mating connector to the green AC header connection on the SLx Series MagnaDC power supply, indicated by the text AC INPUT. The mating connector is locked into place using a plastic flange. Additional, Philips screws are provided on both sides of the connector. Secure the mating connector to the header by tightening the screws on both sides to a torque of 0.3 Nm to 0.7 Nm.
Fig. 3.3 AC input connection for SLx Series MagnaDC power supply¶
Wire Size |
60 °C Types |
75 °C Types |
85 °C Types |
90 °C Types |
|---|---|---|---|---|
RUW, T, TW |
FEPW, RH, RH, RUH, THW, THWN, XHHW, ZW |
V, MI |
TA, TBS, SA, AVB, SIS, FEP, FEPB, RHH, THHN, XHHW |
|
14 AWG |
25 Aac |
30 Aac |
30 Aac |
35 Aac |
12 AWG |
30 Aac |
35 Aac |
40 Aac |
40 Aac |
10 AWG |
40 Aac |
50 Aac |
55 Aac |
55 Aac |
8 AWG |
60 Aac |
70 Aac |
75 Aac |
80 Aac |
6 AWG |
80 Aac |
95 Aac |
100 Aac |
105 Aac |
4 AWG |
105 Aac |
125 Aac |
135 Aac |
140 Aac |
3 AWG |
120 Aac |
145 Aac |
160 Aac |
165 Aac |
2 AWG |
140 Aac |
170 Aac |
185 Aac |
190 Aac |
1 AWG |
165 Aac |
195 Aac |
215 Aac |
220 Aac |
10 AWG |
195 Aac |
230 Aac |
250 Aac |
260 Aac |
20 AWG |
225 Aac |
265 Aac |
290 Aac |
300 Aac |
30 AWG |
260 Aac |
310 Aac |
335 Aac |
350 Aac |
40 AWG |
300 Aac |
360 Aac |
390 Aac |
405 Aac |
250 MCM |
340 Aac |
405 Aac |
440 Aac |
455 Aac |
300 MCM |
375 Aac |
445 Aac |
485 Aac |
505 Aac |
350 MCM |
420 Aac |
505 Aac |
550 Aac |
570 Aac |
Wire Size |
Maximum Current |
|---|---|
18 AWG |
7 Aac |
16 AWG |
10 Aac |
14 AWG |
15 Aac |
12 AWG |
20 Aac |
10 AWG |
25 Aac |
8 AWG |
35 Aac |
6 AWG |
45 Aac |
4 AWG |
60 Aac |
2 AWG |
80 Aac |
3.3.1. Ground Verification¶
With the breaker open and 0 Vac confirmed between every AC input terminal and ground, verify protective-earth continuity:
Using a properly rated ohmmeter or continuity tester, measure the resistance between any exposed unpainted chassis screw and the protective-earth conductor in the ground from the Phoenix AC input connector. The reading should be ≤ 0.1 Ω, confirming a solid ground path.
If the resistance is higher—or if any voltage is present—correct the ground connection before energizing the product.
3.3.2. AC Input Verification¶
Apply AC power to the product by connecting the disconnect or breaker to the mains. Measure the phase-to-phase voltage with a true-RMS multimeter. Measurements of A-B (one-phase) or A-B, B-C, and A-C (three-phase) each must be within ± 10 % of the rated input voltage and within 1% of one another (phase balance).
3.3.3. Fuse Rating¶
SLx Series MagnaDC power supplies contain a variety of power and control fuses. For MagnaDC power supply products with a 1-phase input, there are two (2) power fuses and two (2) control fuses. For MagnaDC power supply products with a 3-phase input, there are three (3) power fuses and two (2) control fuses. Table 3.3 provides the fuses ratings and recommended replacements. Due to in-rush current limiting circuitry in the SLx Series MagnaDC power supply, current draw will not exceed the maximum current rating, even under start-up, allowing for the use of either fast- or slow-blow fuses.
In the event of a fuse fault, AC power must be disconnected from the product and the fuse must be replaced to correct this condition. A cleared power fuse usually indicates a power stage failure, often requiring factory attention. In addition, a cleared fuse can be caused by power surges from lightning storms or other AC transient events.
Warning
To avoid personal injury or damage to the SLx Series MagnaDC power supply, use only the specified replacement fuses.
Power Level |
AC Input Voltage |
Power Fuse Rating |
Recommended
Power Fuse(s)
|
Control Fuse Rating |
Recommended
Control Fuse
|
|---|---|---|---|---|---|
1.5 kW |
85-265 Vac (UI) 1-Phase |
Qty (2) at 25 Aac ea. |
FNQ25 |
Qty (2) at 1 Aac ea. |
FNQ1 |
1.5 kW |
208/240 Vac 3-Phase |
Qty (3) at 8 Aac ea. |
FNQ8 |
Qty (2) at 1 Aac ea. |
FNQ1 |
1.5 kW |
380/415 Vac 3-Phase |
Qty (3) at 5 Aac ea. |
FNQ5 |
Qty (2) at 1 Aac ea. |
FNQ1 |
1.5 kW |
440/480 Vac 3-Phase |
Qty (3) at 5 Aac ea. |
FNQ5 |
Qty (2) at 1 Aac ea. |
FNQ1 |
2.6 kW |
187-265 Vac 1-Phase |
Qty (2) at 25 Aac ea. |
FNQ25 |
Qty (2) at 1 Aac ea. |
FNQ1 |
2.6 kW |
208/240 Vac 3-Phase |
Qty (3) at 15 Aac ea. |
FNQ15 |
Qty (2) at 1 Aac ea. |
FNQ1 |
2.6 kW |
380/415 Vac 3-Phase |
Qty (3) at 8 Aac ea. |
FNQ8 |
Qty (2) at 1 Aac ea. |
FNQ1 |
2.6 kW |
440/480 Vac 3-Phase |
Qty (3) at 8 Aac ea. |
FNQ8 |
Qty (2) at 1 Aac ea. |
FNQ1 |
4 kW |
208/240 Vac 3-Phase |
Qty (3) at 20 Aac ea. |
FNQ20 |
Qty (2) at 1 Aac ea. |
FNQ1 |
4 kW |
380/415 Vac 3-Phase |
Qty (3) at 10 Aac ea. |
FNQ10 |
Qty (2) at 1 Aac ea. |
FNQ1 |
4 kW |
440/480 Vac 3-Phase |
Qty (3) at 10 Aac ea. |
FNQ10 |
Qty (2) at 1 Aac ea. |
FNQ1 |
6 kW |
208/240 Vac 3-Phase |
Qty (3) at 25 Aac ea. |
FNQ25 |
Qty (2) at 1 Aac ea. |
FNQ1 |
6 kW |
380/415 Vac 3-Phase |
Qty (3) at 15 Aac ea. |
FNQ15 |
Qty (2) at 1 Aac ea. |
FNQ1 |
6 kW |
440/480 Vac 3-Phase |
Qty (3) at 15 Aac ea. |
FNQ15 |
Qty (2) at 1 Aac ea. |
FNQ1 |
8 kW |
208/240 Vac 3-Phase |
Qty (3) at 35 Aac ea. |
FNQ35 |
Qty (2) at 1 Aac ea. |
FNQ1 |
8 kW |
380/415 Vac 3-Phase |
Qty (3) at 20 Aac ea. |
FNQ20 |
Qty (2) at 1 Aac ea. |
FNQ1 |
8 kW |
440/480 Vac 3-Phase |
Qty (3) at 20 Aac ea. |
FNQ20 |
Qty (2) at 1 Aac ea. |
FNQ1 |
10 kW |
208/240 Vac 3-Phase |
Qty (3) at 40 Aac ea. |
FNQ40 |
Qty (2) at 1 Aac ea. |
FNQ1 |
10 kW |
380/415 Vac 3-Phase |
Qty (3) at 25 Aac ea. |
FNQ25 |
Qty (2) at 1 Aac ea. |
FNQ1 |
10 kW |
440/480 Vac 3-Phase |
Qty (3) at 20 Aac ea. |
FNQ20 |
Qty (2) at 1 Aac ea. |
FNQ1 |
3.4. DC Output Connection¶
Warning
Shock Hazard Turn off AC power before making any rear panel connections. Ensure that MagnaDC power supply connections, load wiring, and load connections are either insulated or covered so that no accidental contact with lethal output voltages can occur.
The SLx Series MagnaDC power supply DC output connections are made by attaching cables to the output bus bars: one for the positive DC output connection and one for the negative DC output connection. Magna-Power recommends DC power cables be crimped to ring terminals and securely fastened to bus bars using the included 3/8” bolts, washers, and lock washers. The bus bars contain 3/8”-16 threaded inserts. The recommended torque for the DC connection is 15 lb-ft (20.3 Nm).
Fig. 3.4 DC output bus bars for SLx Series MagnaDC power supply¶
Magna-Power recommends selecting a wire size sufficient to handle the product’s maximum output current rating, regardless of the intended load current or current set point.
The recommended wire size based on output current is shown in the table below.
Wire Size (USA) |
Equivalent Wire Size
(International)
|
Wires Per Output Terminal |
Maximum Current |
|---|---|---|---|
6 AWG |
10 mm2 |
1 |
85 Adc |
4 AWG |
25 mm2 |
1 |
110 Adc |
3 AWG |
25 mm2 |
1 |
130 Adc |
2 AWG |
35 mm2 |
1 |
150 Adc |
1 AWG |
50 mm2 |
1 |
170 Adc |
1/0 AWG |
50 mm2 |
1 |
200 Adc |
2/0 AWG |
70 mm2 |
1 |
235 Adc |
3/0 AWG |
95 mm2 |
1 |
275 Adc |
4/0 AWG |
120 mm2 |
1 |
315 Adc |
1/0 AWG |
50 mm2 |
2 |
400 Adc |
2/0 AWG |
70 mm2 |
2 |
470 Adc |
3/0 AWG |
95 mm2 |
2 |
550 Adc |
4/0 AWG |
120 mm2 |
2 |
630 Adc |
1/0 AWG |
50 mm2 |
4 |
800 Adc |
2/0 AWG |
70 mm2 |
4 |
940 Adc |
3/0 AWG |
95 mm2 |
4 |
1100 Adc |
4/0 AWG |
120 mm2 |
4 |
1260 Adc |
Notes:
The current capacity for AWG wires derived from the National Electric Code. Maximum ambient temperature: 40°C. Maximum wire temperature: 90°C. Continuous duty with wires in free air, not bundled or in conduit.
The current capacity of aluminum wire is approximately 84% of the capacity listed for copper wire.
For higher current levels, it’s recommended to use bus bars with holes for additional cable feeds or direct bus bar connection to the load.
Warning
FIRE HAZARD Select a wire size large enough to carry the SLx Series MagnaDC power supply model’s maximum rated current to prevent overheating of the wires. Make sure power cable connections are secured tightly in accordance with the torque recommendation to prevent overheating of the bus bars.
3.4.1. Grounding the DC Output¶
The SLx Series MagnaDC power supply DC output is floating up to the DC output isolation specifications. A floating output means the output terminals are not electrically connected to ground and the produced output voltage is from the positive terminal with respect to the negative terminal. Neither output terminal needs to be connected to ground, however if desired, either the positive or negative terminal can be connected to earth ground.