MEAN WELL NMS-240-24 is a single-output power module for the NMP650 and NMP1K2 modular power systems. Configuration code H provides 24 V, a 0–10 A load range and 240 W rated output, subject to the module limits, the front-end total and derating. It supports local ON/OFF, DC OK, remote sense, voltage/current programming and current sharing. A compatible NMP front end is required.
Product Datasheet
Download MEAN WELL NMS-240 Datasheet (PDF)
The NMS-240 section is on PDF pages 1, 2, 3, 4, 5, 7, 8, 11, 13, 14, 15, 16, 17. Refer to the complete mechanical drawings and notes when planning installation.
Model-Specific DC Output
| Configuration code |
H |
| Rated output voltage |
24 V. |
| Rated output current |
10 A; permitted load range 0–10 A. |
| Rated output power |
240 W. |
| Ripple and noise, maximum |
150 mVp-p. |
| Voltage adjustment / PV range |
15–30 V. |
| Voltage tolerance |
±1.0%; includes set-up, line and load regulation. |
| Line regulation |
±0.2%. |
| Load regulation |
±0.5%. |
Output voltage, current and power limits apply together. Raising the set voltage does not increase the permitted module power; the assembled NMP supply must also remain within its own total output limit.
NMP System Integration
| Compatible front ends |
NMP650: four module slots and 650 W maximum total; NMP1K2: six slots and 1200 W maximum total. |
| Mains connection |
The NMP front end accepts 90–264 VAC or 120–370 VDC; AC frequency 47–63 Hz. Connect this output module through the compatible front end, not directly to mains. |
| Cooling and format |
The NMP system uses a 1U low-profile chassis and temperature-controlled fans. Preserve the host airflow and apply both input and temperature derating. |
| Global and local controls |
Global control acts on the complete NMP supply; local controls act on module outputs. The global and local ON/OFF polarities are different. |
The assembled power supply, output modules, mating parts and selected interconnections must match the required configuration. The sum of the connected module loads must remain within the front-end power limit as well as each module and channel limit.
The catalogue lists a five-year warranty for the NMP series. Medical diagnostic equipment, test and measurement, communications and automation are application examples; suitability depends on the complete equipment design.
Front-End Auxiliary Supply and Global Signals
On the NMP front end, CN32 pins 1/2 provide +5V-AUX-P at 1.5 A maximum for NMP650 or 2 A maximum for NMP1K2; pins 3/4 are GND-P. The auxiliary tolerance is ±10% and ripple is 50 mVp-p maximum.
CN32 pin 6 is RC1: short to GND-P for global ON, open for OFF. When global remote control is unused, fit the shorting connector supplied with the NMP power supply, linking pin 6 to pin 3; without that link the supply has no output. This is a front-end accessory, not a separate module auxiliary-output rating.
CN32 pin 5 is the T-Alarm TTL output, referenced to pins 3/4, with 10 mA maximum source current. Normal temperature gives 0–0.5 V. Above the alarm threshold it gives 4.5–5.5 V while output remains on; above the safe-temperature limit the output turns off. The temperature-controlled fan and its alarm function belong to the front end.
Voltage Programming, Current Programming and Remote Sense
Set the local output using VR60. For external PV control, connect the control voltage to CN81 pin 8, referenced to pin 1 or 2. The programmable voltage range is the same as the model's voltage-adjustment range. The page 14 transfer chart is non-linear and includes a separate low-range region for the 12 V E-code module; use that chart and the model-specific voltage limits. Its 100% output reference is shown at a 5 V control signal.
For PC control, connect the external control voltage to CN81 pin 7, referenced to pin 1 or 2. The specified constant-current setting range is 40–100% of rated current; the non-linear chart shows 40% at 1.8 V and 100% at 5 V. The additional 115% typical OLP point is a protection reference, not an increased continuous-output rating. PC control must not be used during parallel operation.
Remote sense compensates up to 0.5 V of load-wiring drop. Connect CN81 pin 9 (+S) to the positive load point and pin 10 (-S) to the negative load point, with the sense lines twisted as a pair. Keep the sensed output and load within the module ratings.
Local Control, Auxiliary Output and Protection
| Local remote ON/OFF |
CN81 pin 3 (RC2) to pin 1 or 2 (GND): open = output ON; short = output OFF. |
| Module auxiliary Vcc2 |
5 V, 10 mA maximum; ±10% tolerance; 50 mVp-p maximum ripple. Available on CN81 pin 4. |
| DC OK and indicator |
CN81 pin 5: 4.5–5.5 V when output is ON; 0–0.5 V when OFF. Maximum source current 10 mA; reference pin 1 or 2. The module indicator is LD60. |
| Overload |
105–125% of rated output power; constant-current limiting. |
| Overvoltage |
31–37 V; shut down output and re-power to recover. |
| Overtemperature |
Shut down output; automatic recovery after temperature falls. |
Current Sharing and Parallel Operation
For compatible NMS modules, connect CN81 pin 6 (CS) and the pin 1/2 signal grounds in parallel as shown in the catalogue. Set their output-voltage differences to less than 0.2 V, and use short, large-diameter output wiring to the load.
A maximum of four NMS modules is supported in NMP650 and six in NMP1K2. The total current must not exceed the sum of the participating module current ratings, and total output power must remain within the NMP650 650 W or NMP1K2 1200 W limit. Apply module, wiring and thermal limits as well.
Below 10% of rated load, only the master may operate while slave modules enter standby. For C-code 5 V and E-code 12 V modules in current-sharing operation, short-circuit protection may operate in hiccup or constant-current-limiting mode. Ripple can be higher than the single-module specification at light load.
Switch all parallel modules ON/OFF together; their LED and DC OK states must follow together. Do not use PC current programming in parallel. NMP650 accepts catalogue parallel-connection codes 00, 01, 02, 03, 06, 07, 10 and 16; NMP1K2 provides codes 00–31, with the actual slot grouping defined by the configuration table.
Timing and Measurement Conditions
| Set-up / rise time |
1500 / 60 ms at full load. |
| Typical hold-up time |
16 ms at 230 VAC and 75% of the specified assembled-system load; 10 ms at 230 VAC and full specified assembled-system load. |
| General test conditions |
230 VAC input, rated load and 25°C ambient unless a parameter states otherwise. |
| Ripple measurement |
20 MHz bandwidth, 12-inch twisted pair, with 0.1 µF and 47 µF capacitors in parallel at the termination. |
| Tolerance definition |
Includes set-up tolerance, line regulation and load regulation. |
The hold-up values apply to the catalogue's reference combinations: NMP650 with one each of C/E/H/K at 650 W maximum, or NMP1K2 with C×1, E×1, H×2 and K×2 at 1200 W maximum. The front-end efficiency and hold-up performance depend on the installed module combination.
Temperature, Input Derating and Environment
| Input-voltage load curve |
At 60 Hz: 70% load at 90 VAC, rising to 100% at 110 VAC; the full-load plateau extends to 264 VAC. Apply this together with the temperature curve. |
| Operating humidity |
20–90% RH, non-condensing. |
| Storage conditions |
-40°C to +85°C; 10–95% RH, non-condensing. |
| Temperature coefficient |
±0.03%/°C from 0°C to +50°C. |
| Vibration |
10–500 Hz, 2 G, 10-minute cycle; 60 minutes each along X, Y and Z. |
For horizontal installation, the NMP/NMS load curve permits 100% from -30°C to +50°C at 230 VAC, or from -25°C to +50°C at 115 VAC. Above +50°C derate to 60% at +70°C with 230 VAC, or 50% at +70°C with 115 VAC. The -30°C to below -25°C region is marked 230 VAC only.
Above 2000 m, the catalogue requires an ambient-temperature reduction of 5°C per 1000 m for fan-cooled models, or 3.5°C per 1000 m for fanless models. Use the fan-cooled requirement for the NMP installation. This thermal note does not establish an additional maximum operating altitude.
Dimensions, Weight and DC Terminals
| Module dimensions, L × W × H |
118.5 × 37.9 × 18 mm, as listed in the specification table; allow connector and terminal clearances shown in the mechanical drawing. |
| Typical single-module weight |
142 g (0.142 kg). |
| Packing reference |
72 modules / 11.2 kg / 1.04 CUFT; this is the carton quantity and mass. |
| DC output terminals |
+V and -V screw terminals; recommended screw M3.5, maximum mounting torque 10 kgf·cm and maximum penetration depth 10 mm. |
| Mechanical reference |
Use physical page 11 for module geometry, VR60, LD60 and CN81 orientation. The terminal limits are distinct from the front-end chassis mounting limits. |
CN81 Control Connector
| Module connector |
HRS DF11-10DP-2DS or equivalent. |
| Mating housing |
HRS DF11-10DS or equivalent. |
| Contact series |
HRS DF11-**SC or equivalent, as printed; select the complete contact variant for the intended conductor and connector. |
| Pin 1: GND |
Signal reference. |
| Pin 2: GND |
Signal reference. |
| Pin 3: RC2 |
Open to pin 1 or 2: output ON; short: output OFF. |
| Pin 4: Vcc2 |
4.5–5.5 V, 10 mA maximum, referenced to pin 1 or 2. |
| Pin 5: DC OK |
ON: 4.5–5.5 V; OFF: 0–0.5 V; source 10 mA maximum, referenced to pin 1 or 2. |
| Pin 6: CS |
Current sharing, referenced to pin 1 or 2. |
| Pin 7: PC |
Constant-current programming, referenced to pin 1 or 2. |
| Pin 8: PV |
Output-voltage programming, referenced to pin 1 or 2. |
| Pin 9: +S |
Positive remote sense. |
| Pin 10: -S |
Negative remote sense. |
The mating housing and contact references identify compatible connection parts; they are not a statement that an additional mating cable or contact set is included with this module.
Configuration and Connection Accessories
| Unused output slot |
BLANK-NMS240 is the catalogue's blank-slot assembly; select it for unused NMP module positions and confirm supply details with MEAN WELL. |
| Front-end CN32 connector |
HRS DF11-6DP-2DS or equivalent; mating housing HRS DF11-6DS or equivalent; contact reference HRS DF11-**SC or equivalent. |
Select the required module configuration with the compatible NMP650 or NMP1K2 front end. The catalogue's configuration examples describe assembled systems and do not mean that every module, blank-slot assembly or connection accessory accompanies this individual module.
Parallel or series connection accessories are supplied by selection through MEAN WELL. Specify the required configuration and obtain its compatible connection arrangement before installation.
Safety and Medical Equipment Integration
The NMS module safety table and the NMP system table list the following catalogue standards. The catalogue lists IEC 60601-1:2005+A1; TUV BS EN/EN 60601-1:2006+A1+A12+A2; ANSI/AAMI ES60601-1:2005+A2; CAN/CSA C22.2 No.60601-1:2014+A2; IEC 62368-1:2014; UL 62368-1, 2nd edition; CSA C22.2 No.62368-1-14, 2nd edition; TUV BS EN/EN 62368-1:2014+A11; and EAC TP TC 004.
For the assembled NMP supply, primary-to-secondary isolation is 2 × MOPP and primary-to-earth isolation is 1 × MOPP. The catalogue gives touch current below 100 µA and earth leakage below 400 µA at 264 VAC, with I/O 4 kVAC, I/FG 2 kVAC and O/FG 0.5 kVAC withstand tests. Insulation resistance is 100 MΩ at 500 VDC, 25°C and 70% RH.
The series is suitable for consideration in BF-type medical applications. These component-level properties do not certify the finished equipment as BF or establish compliance for an assembled medical system; insulation, enclosure, patient connections, leakage and EMC must be assessed in the final equipment.
The NMP catalogue lists EN/BS EN 55032 and 55011 Class B conducted and radiated emissions, EN/BS EN 61000-3-2 Class A harmonics and EN/BS EN 61000-3-3 flicker. Immunity is referenced to EN/BS EN 60601-1-2, EN/BS EN 55035 and SEMI F47. Its test magnitudes include ESD 15 kV air/8 kV contact, RF field 10 V/m, EFT 2 kV, surge 4 kV line-to-FG/2 kV line-to-line, conducted RF 3 V and power-frequency magnetic field 30 A/m; dips include 100% for one period and 30% for 25 periods, with 100% interruption for 250 periods.
The published EMC tests used a 360 × 720 × 1 mm metal plate. The supply is a component for installation in final equipment, whose complete EMC compliance must be reconfirmed.
