MEAN WELL DHP-1UT-B is a 1U, 19-inch terminal-block rack shelf for matching 24 V or 48 V NCP-3200 power supply / charger modules. The listed system ratings require the stated populated configuration; the rack alone does not generate those outputs. Select the modules and protocol configuration separately and confirm what is included in the order.
Product Datasheet
Download MEAN WELL DHP-1UT-B Datasheet (PDF)
The DHP-1UT-B section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43. Refer to the complete mechanical drawings and notes when planning installation.
Rack Identity and Configured System Ratings
Product type
1U, 19-inch rack shelf with terminal-block connections
Compatible module
NCP-3200-24 or NCP-3200-48, including their CAN versions
Module capacity
1–4 identical modules per shelf
Rack-only reference weight
4760 g
24 V configuration maximum output current
532 A
24 V configuration maximum output power
12768 W
48 V configuration maximum output current
268 A
48 V configuration maximum output power
12864 W
The electrical examples in this section use four identical modules connected in parallel. They describe configurations of this rack model, not separate rack ordering codes. The 4760 g value is the catalogue packing reference for one rack, not the mass of a populated four-module system or a measured shipping weight.
The blank voltage suffix identifies the 24 V / 48 V rack. Fit a uniform set of one model, not mixed 24 V and 48 V modules. Power supply operation is the module default; the low-voltage modules can also be configured for battery charging. The catalogue headline “12800 W” is a series designation; use the model-specific totals above.
Input and Installation Limits
Configured-system AC input
90–264 VAC
Configured-system DC input
127–400 VDC
Input frequency
47–63 Hz
Typical input current per module
17 A at 230 VAC
Leakage per module
<2 mA at 230 VAC
Three- or four-module full-load ambient limit
40°C
The system leakage current depends on the number of installed modules. Do not treat the per-module input-current or leakage values as the total for a populated rack. All normal test values use 230 VAC, rated load and 25°C ambient unless otherwise specified.
Installed NCP modules require input derating: 50% load at 90 VAC, rising to 100% at 180 VAC and remaining at 100% to 264 VAC at 60 Hz. Their horizontal thermal curve is 80% at −30°C, 100% from −20 to +50°C, then 50% at +70°C; −30 to −20°C requires 230 VAC. The rack adds the stricter +40°C full-load limit when three or four modules are populated. Observe both module and rack limits and maintain front-to-rear airflow.
Charger Configurations
24 V configuration default boost charge voltage
28.8 V
24 V configuration default float charge voltage
27.6 V
24 V configuration charging current range
0–440 A
48 V configuration default boost charge voltage
57.6 V
48 V configuration default float charge voltage
55.2 V
48 V configuration charging current range
0–220 A
These charging ranges require four matching NCP-3200-24 or four matching NCP-3200-48 modules. Select charger mode and curve settings through the fitted PMBus/CANBus interface or SBP-001. The default charging curve is three-stage CC/CV/float, with two-stage CC/CV also available; the indicated transition current is 10% of CC.
Module default CC is 110 A for the 24 V class and 55 A for the 48 V class. The programmable boost/float defaults are 28.8/27.6 V and 57.6/55.2 V. Preset gel values are 28/27.2 V or 56/54.4 V; flooded values 28.4/26.8 V or 56.8/53.6 V; AGM values 29/27 V or 58/54 V. Two-stage presets omit float. Confirm settings and allowable current with the battery manufacturer for the intended flooded/gel/AGM lead-acid or listed lithium-ion iron/manganese battery. A module’s suggested Ah range is not a guaranteed rack-wide battery range.
Output Voltage and Current Programming
PV adjustment
50–125% of the graph’s nominal reference voltage
PC adjustment
20–100% of rated current
PV connection
CN1 pin 26 to CN1 pin 24 (−V signal)
PC connection
CN1 pin 25 to CN1 pin 24 (−V signal)
PV applies to power supply operation. The graph uses 24/48 V as the 100% voltage reference. Below 0.4 V control input the output is at its factory setting; 0.4–1 V selects 50%, then the curve rises nonlinearly toward 125% at approximately 4.7 V control input. Use the published curve rather than assuming a linear conversion over the entire control range.
Available output current changes with the voltage setting: 80% from 50–90% output voltage, rising to 100% at 95%, then remaining at 100% through 100% voltage. Above that, current decreases to 80% at 125% voltage (30 V or 60 V). The graph’s 100% current reference is 532/268 A. Always keep output within the maximum power limit.
For PC, 0.4–1 V control input corresponds to 20% current; the nonlinear rising region reaches 100% at 4.7 V and remains at 100% to 5 V. The plot below 0.4 V is an approximately 110% limiting region, not an additional rated operating range. Very low constant-current settings can increase ripple.
Remote and Local Sense
Sense is only for 24 V / 48 V power supply operation. CN2 pin 1 (+S) goes to load positive and pin 2 (−S) to load negative. Use a twisted or shielded sensing pair away from load-current wiring. Compensation is up to 0.5 V, and output-wire drop must remain less than 0.5 V.
Without remote sensing, join CN2 pin 1 to pin 3 (+V signal), and pin 2 to pin 4 (−V signal). These local-sense links are required for correct voltage; leaving sense incorrectly connected can raise output and trigger OVP. Signal pins must not carry load current.
Parallel Racks and Communication
Maximum parallel assembly
10 rack shelves / 40 identical modules
Output-voltage matching
Less than 0.2 V difference
Recommended current reduction
10% of the summed module current
PMBus configuration
Revision 1.1, maximum 100 kHz
CANBus configuration
CAN 2.0B; catalogue speed printed as maximum 250 KHz
Select the communication protocol through the installed module ordering codes and compatible control arrangement. The rack provides the interconnections; the generic rack model is not a promise that unlike protocol modules can be mixed.
Parallel operation requires identical models and output-voltage/current settings. Configure the shelves in parallel before connecting the common load; do not connect each shelf independently to the load first. Join DA, DB and −V control signals, with twisted +S/−S wiring where the low-voltage PSU sense function applies. Long cables can inject noise; use the appropriate termination accessory in an unused JK1 connection.
The catalogue example is eight NCP-3200-24 modules in two shelves: 133 A × 8 × 0.9 = 957.6 A recommended total. This reduction helps avoid unequal current limiting caused by component tolerance. Under multiple-rack operation, light-load ripple may be higher; the parallel-operation note specifies a return to normal above 10% of total rated load.
CN1 Control Connector
Header
HRS DF11-26DP-2DS
Mating housing
HRS DF11-26DS or equivalent
Contact family
HRS DF11-**SC or equivalent
Pins 1, 5, 9, 13
AC-OK for modules A, B, C, D
Pins 2, 6, 10, 14
DC-OK for modules A, B, C, D
Pins 3, 7, 11, 15
Remote ON-OFF for modules A, B, C, D
Pins 4, 8, 12, 16
T-ALARM for modules A, B, C, D
Pins 17–20
NC; reserved
Pin 21
+5V-AUX: 4.5–5.5 V, 0.3 A maximum
Pin 22
GND-AUX; isolated signal return
Pin 23
+12V-AUX: 10.8–13.2 V, 0.8 A maximum
Pin 24
−V signal; non-isolated control reference, not a load terminal
Pin 25 / pin 26
PC / PV
DF11-**SC is a contact-family entry with an unspecified suffix. Select the actual contact for the wire assembly instead of treating the wildcard as a complete order code.
For whole-rack control, connect the four ON/OFF signals to +5V-AUX through the control switch; individual switches can control the four modules separately. Short / 4.5–5.5 V is ON, open / −0.5 to +0.5 V is OFF; maximum input is 5.5 V. An open ON/OFF connection gives no main output.
AUX ratings are 5 V at 0.3 A, ±10%, 150 mVp-p ripple and 12 V at 0.8 A, ±10%, 450 mVp-p ripple. These are the listed auxiliary-system values, not four times those values. The +12V-AUX path has OR-ing diodes and is not controlled by remote ON/OFF.
CN2 Sense and JK1 Interconnections
CN2 header
JST SM04(4.0) B-BHS-1-TB
CN2 mating housing
JST BHR-04VS-1 or equivalent
CN2 contact
JST SBH-001T-P-0.5 or equivalent
CN2 pins 1, 2, 3, 4
+S, −S, +V signal, −V signal; 24 V / 48 V PSU mode only
JK1
RJ45, 8 positions
JK1 pins 1, 2
DA, DB parallel-control signals
JK1 pin 3
−V signal; control reference, not a load terminal
JK1 pin 4
CONTROL; remote ON-OFF in the PMBus interface
JK1 pin 5
+5V-AUX in the PMBus interface
JK1 pin 6
SDA for PMBus / CANH for CANBus
JK1 pin 7
SCL for PMBus / CANL for CANBus
JK1 pin 8
GND-AUX
Non-isolated parallel/control signals reference −V signal; isolated communication and control signals reference GND-AUX. Follow the numbered rear-view connector drawings. The RJ45 shape does not make this an Ethernet port.
Signals and Status Indicators
Alarm outputs are isolated TTL, referenced to GND-AUX, output-only and rated 10 mA maximum. High is 3.5–5.5 V and low is −0.5 to +0.5 V. AC-OK is high at input ≥87 Vrms and low at ≤75 Vrms. T-ALARM is high for temperature alarm or fan failure, and low during normal operation.
In power supply mode, DC-OK is high when output is ≤77% ±5%, and low when output is ≥80% ±5%. In charger mode the thresholds are ≤66% ±5% high and ≥67% ±5% low; DC-OK is associated with battery-low protection.
The status LED is green during normal power supply operation and steady red for abnormal protection/fan status. Flashing red at an internal temperature of 60°C signals an alarm while normal operation continues without entering OTP. In charger mode, orange identifies CC/CV charging, green identifies float, and red also covers charging timeout. The two-stage graph identifies green at battery full.
Protection of the Populated System
Protection is provided by the installed NCP modules. In PSU operation, overload is 105–115% rated current with constant-current limiting followed by shutdown after 5 seconds; re-power after the output falls to recover. Output below 80% of Vset for 5 seconds also shuts down. Overtemperature shuts down output and recovers automatically after cooling.
For 24 V modules, overvoltage shutdown is 31.5–37.5 V; for 48 V modules it is 63–75 V. Re-power to recover. Charger mode uses the corresponding overvoltage and overtemperature protections, with DC-OK associated with battery-low protection.
The modules include OR-ing isolation and support hot swap. Use the rack installation procedure and the correct voltage-class rack. The protection functions do not remove the need for correctly rated external wiring and system protection.
Mechanical Installation and Accessory List
Dimensions without mounting brackets
400 × 440 × 44 mm
Dimensions with mounting brackets
400 × 482.6 × 44 mm
Case drawing
257B; general dimensional tolerance ±0.5 mm
Mounting screw specification
M4; maximum penetration 4 mm; recommended torque 7–10 kgf·cm
DC terminal screws
Four M8 L=16 positions as shown
Remote-control mating wire, CN1
Catalogue quantity 1; UL1061, 28 AWG, 15 mm loop dimension
Remote-sense mating wire, CN2
Catalogue quantity 1; UL1007, 26 AWG, 15 mm loop dimension
PMBus termination, JK1
Catalogue quantity 1; black/white wires
CANBus termination, JK1
Catalogue quantity 1; black/red wires
Output-terminal screws
Catalogue accessory quantity 4
The 19-inch mounting drawing gives 466.2 mm between the front fixing positions, 7 × 10.2 mm slotted openings and 29.3 mm handle projection. Use the depicted M4 locations and the maximum penetration limit; maintain clearance for the rear AC terminal blocks, control plugs and output connections.
Viewed from the front, the four module positions are D, C, B and A from left to right. The airflow arrow runs from the front modules toward the rear. Each installed module has its own status indicator and SVR adjustment access.
The accessory page lists the mating wires, protocol-specific termination plugs and output-terminal screws by item name and quantity, without unique wire-kit/termination ordering codes. Confirm the supplied items and choose the termination appropriate to the installed protocol.
Environment and Reliability
Operating ambient
−30 to +70°C, subject to input and thermal derating
Operating humidity
20–90% RH, non-condensing
Storage
−40 to +85°C; 10–95% RH, non-condensing
Temperature coefficient
±0.03%/°C from 0 to 50°C
Vibration
10–500 Hz, 2G; 10 minutes/cycle, 60 minutes each along X, Y and Z
Minimum calculated MTBF
3698.9 thousand hours, Telcordia SR-332; 818.3 thousand hours, MIL-HDBK-217F at 25°C
Manufacturer warranty
5 years
For fan-cooled operation above 2000 m, reduce permissible ambient temperature by 5°C per additional 1000 m. This derating note does not establish a maximum operating altitude.
Safety and EMC
Dielectric withstand
Input/output: 3 kVAC; input/FG: 2 kVAC; output/FG: 1.5 kVDC
Insulation resistance
100 MΩ between input/output, input/FG and output/FG; 500 VDC, 25°C, 70% RH
Conducted / radiated emissions
BS EN/EN 55032 (CISPR32): Class B conducted / Class A radiated
Harmonic current / voltage flicker
BS EN/EN 61000-3-2 Class A / BS EN/EN 61000-3-3
The power supply specification lists UL 62368-1, CSA C22.2 No. 62368-1, TUV BS EN/EN 62368-1 and EAC TP TC 004 approvals, with design referring to AS/NZS 62368.1. RCM is voluntary under the referenced IEC/AS/NZS requirements. These component qualifications do not certify the completed installation. The rack charger-system table separately lists UL 62368-1, TUV BS EN/EN 62368-1 and EAC TP TC 004.
Immunity references BS EN/EN 55024 and 61000-6-2, with tests under 61000-4-2/-3/-4/-5/-6/-8/-11: ESD 8 kV air and 4 kV contact; radiated RF, EFT/burst and conducted RF Level 3; surge 2 kV line-to-line and 4 kV line-to-earth; magnetic field Level 4. Voltage dips are >95% for 0.5 period and 30% for 25 periods; interruptions are >95% for 250 periods.
The catalogue EMC arrangement mounts the component on a 1000 × 1300 mm metal plate, 2 mm thick. Reconfirm compliance in the final equipment.
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