IDSWITCH LMP1218-PWM Master Power Unit
General Safety Instruction
Safety Instruction
As dangerous voltages and high temperature exist within the LMP1218-PWM Master Power Unit, only qualified and authorized maintenance personnel are permitted to open and repair it. Please make sure the unit is turned off before open and repair it.
This manual contains information concerning the installation and operation of LMP1218-PWM Master Power Unit. All relevant parts of the manual should be read prior to commencing the installation. Please follow the local stipulation meantime.
Any operation against safety requirement or against design, manufacture, safety standard, and are out of the manufacturer warranty.
General Precaution
- Do not expose to dust, rain, snow or liquids of any type，it is designed for indoor use. DO NOT block off ventilation, otherwise the LMP1218-PWM Master Power Unit would be overheating.
- To avoid fire and electric shock，make sure all cables selected with right gauge and being connected well. Smaller diameter and broken cable are not allowed to use.
- Please do not put any inflammable goods near to this unit.
- Never place this unit directly above batteries, gases from a battery will corrode and damage LMP1218-PWM Master Power Unit.
- Do not place battery over LMP1218-PWM Master Power Unit.
Precaution regarding battery operation
- Use plenty of fresh water to clean in case battery acid contacts skin, clothing, or eyes and consult with doctor as soon as possible.
- The battery may generate flammable gas during charging. NEVER smoke or allow a spark or flame in vicinity of a battery.
- Do not put the metal tool on the battery, spark and short circuit might lead to explosion.
- REMOVE all personal metal items such as rings, bracelets, necklaces, and watches while working with batteries. Batteries can cause short-circuit current high enough to make metal melt, and could cause severe burns.
LMP1218-PWM INTRODUCTION
Features
- Smart battery charger 12V18A
- Active PFC charging
- 16 Fused DC outputs, including water pump and lighting central control.
- Battery charging relay 12V 30A
- Battery Low Voltage Protection
- Built in Main Switch to isolate the battery when in storage
- Support external remote Main switch
- Control one water pump with two tank probes
- Solar charger controller (PMW), 15A
LED Display
Table 1 LED indication
| NO. | LED | Color | Status | Description |
| 1 | CHG | Green | ON | Battery charged |
| Flashing(flash once every second) | Battery charging | |||
| OFF | Battery discharge | |||
| 2 | Dischg | Orange | ON | Battery discharging |
| OFF | Battery charging | |||
| 4 | CHG/ Dischg | Green/Orange | Both ON | Power supply |
KEY FEATURES AND FUNCTIONS
Multiple inputs
LMP master power unit may have multiple sources at one time. These sources include the Shore power, Solar panel and Alternator (Motor battery). There is priority among these sources, but LMP allows several sources to charge auxiliary battery at the same time. The priorities are listed below.
Table 2 Energy sources priority
| AC Mains | ✓ | ✓ | ✓ | ||
| Solar panel | ✓ | ✓ | ✓ | ✓ | |
| Alternator (Motor battery) | ✓ | ✓ | ✓ | ||
| Dominating Source | AC mains+ Solar panel | AC mains+ Solar panel | AC mains | Alternator + Solar panel | Solar panel |
Battery Charger of Auxiliary Battery
The charger automatically starts when the appropriate qualified power is connected, either from grid, generator. With multiple charging stages (soft start-bulk absorption float-recycle), LMP1218-PWM is designed to fully charge battery quickly. To guarantee the optimal charging for batteries of different states, the LMP1218-PWM features Microprocessor-controlled charging algorithm. The Float and Recycle charging programs guarantees the battery being charged properly upon being connected for a longer period.
Figure 1 Charging algorithm for lead-acid battery
Lithium battery charging
The LMP1218-PWM can be configured to charge Lithium battery.
Power Supply Mode
If no battery is attached to LMP1218-PWM unit, it will work as a power supply automatically with a 12.8VDC output.
PWM Solar charger controller
LMP has a built-in PWM charger for the service battery.
- Max open voltage is 30VDC
- Max supply current is 15A
Voltage Charging Relay (VCR)
LMP1218-PWM Master Power Unit has a built-in voltage charging relay (VCR), which can get power from alternator to supply the system whilst the engine is running.
Here is the working logic of VCR
Table 3 VCR working logic
| D+ Enabled | D+ Disabled | ||
| LFP battery | Disengage | VCR will be disengaged immediately if no D+ is sensed or detected | VCR will be disengaged when alternator/motor battery’s voltage is less than13.5V and charging current is less than 2A for 60S |
| Engage | VCR will be engaged when:1) D+ is sensed or detected; 2) Alternator or motor battery’s voltage is greater than 14.0V for 10S | VCR will be engaged when alternator or motor battery’s voltage is greater than14.0V for 10S | |
| AGM/GELbattery | Disengage | VCR will be disengaged immediately if no D+ is sensed or detected | VCR will be disengaged when alternator or motor battery’s voltage is less than12.8V for 60S |
| Engage | VCR will be engaged when:1) D+ is sensed or detected; 2) Alternator or motor battery’s voltage is greater than 12.0V for 10S | VCR will be engaged when alternator or motor battery’s voltage is greater than13.4V for 10S |
Remarks:
D+ enabled means the LMP box has sensed or detected D+ once, afterwards LMP box would deem it as D+ enabled
D+ disabled means the LMP box has never sensed or detected D+, so LMP box would deem it as D+ disabled
Battery Low Voltage Protection (BLVP)
LMP1218-PWM master power unit has a built-in low voltage protection relay. The protection is decided by battery type lithium battery or lead acid battery. Below please find the protection and resume value:
Table 4 Low voltage protection and resume
|
Protection |
Threshold value |
| Low voltage protection | GEL/WET/AGM: 10.8+/-0.3Vdc |
| LFP: 11.2+/-0.3Vdc | |
| Low voltage protection resume |
AGM/GEL/WET: 11.8+/-0.3Vdc |
| LFP: 12.2+/-0.3Vdc |
Remarks:
- There will be 60 seconds as time delay before above protection or resume
DC Distribution
STRUCTURE AND INSTALLATION
LMP1218-PWM Master Power Unit 
| No. | DEFINITION | LABEL | DESCRIPTION |
| 1 | AC input port | / | AC input port |
| 2 | / | PV | Connect to PV Panel |
| 3 | / | Fridge | Connect to fridge |
| 4 | / | Lifting Bed | Connect to lifting bed |
| 5 | / | Motor BAT | Connect to Motor BAT |
| 6 | / | AUX BAT | Connect to AUX BAT |
| 7 | Loads | [1]1 | POS : Awning lamp |
| [1]2 | GND : | ||
| [1]3 | POS : Info D+ Fridge | ||
| [1]4 | POS : Side lights | ||
| [1]5 | GND : Side lights | ||
| [1]6 | POS : Info D+ SAT antenna | ||
| [1]7 | POS : Pump + WC | ||
| [1]8 | GND : Pump + WC | ||
| [1]9 | POS : Info D+ Preheating pump | ||
| [1]10 | POS : Autoradio Signal | ||
| [1]11 | GND : | ||
| [1]12 | GND : | ||
| [1]13 | POS : Oven + Piezzo | ||
| [1]14 | GND : Oven +Piezzo |
| [1]15 | GND : Buzzer Footstep | ||
| 8 | Loads | [2]1 | POS : Lighting Right side |
| [2]2 | GND : Lighting Right side | ||
| [2]3 | POS : Buzzer Footstep | ||
| [2]4 | POS : Lighting Left side | ||
| [2]5 | POS : Lighting Left side | ||
| [2]6 | GND: In/Out Footstep (COM) | ||
| [2]7 | POS : Power Tablet | ||
| [2]8 | GND : Power Tablet | ||
| [2]9 | Out Footstep (Normally Open) | ||
| [2]10 | POS: | ||
| [2]11 | GND: | ||
| [2]12 | In Footstep (Normally Open) | ||
| [2]13 | POS + Plug 12V Kitchen | ||
| [2]14 | GND – Plug 12V Kitchen | ||
| [2]15 | M1 – Footstep | ||
| [2]16 | POS + Plug USB Kitchen/Bedroom | ||
| [2]17 | GND – Plug USB Kitchen/Bedroom | ||
| [2]18 | M2 -Footstep | ||
| 9 | Loads | [3]1 | POS : Permanent Autoradio |
| [3]2 | GND : | ||
| [3]3 | POS : SAT antenna | ||
| [3]4 | POS : Combi + TRUMA/ALDE control | ||
| [3]5 | GND : Combi + TRUMA/ALDE control | ||
| [3]6 | GND : Elec Fridge | ||
| [3]7 | POS : TV | ||
| [3]8 | GND : TV | ||
| [3]9 | POS : Elec Fridge | ||
| 10 | Signal terminal | [7]1 | D+ (active high +BAT) |
| [7]2 | Switch ON/OFF (COM) | ||
| [7]3 | D+ (active down GND) | ||
| [7]4 | |||
| [7]5 | Sidelights (active high +BAT) | ||
| [7]6 | +APC (active high +BAT) | ||
| [7]7 | Sidelights (active down GND) | ||
| [7]8 | +APC (active down GND) | ||
| [7]9 | Switch ON/OFF (NO) | ||
| [7]10 | Footboard End of stroke (COM) | ||
| [7]11 | Footboard End of stroke (NO) | ||
| [7]12 | |||
| 11 | Grey water tank | [6]1 | CW-REF |
| [6]2 | CW-25% | ||
| [6]3 | CW-50% | ||
| [6]4 |
| [6]5 | CW-75% | ||
| [6]6 | CW-100% | ||
| [6]7 | |||
| [6]8 | |||
| 12 | Fresh water tank | [5]1 | CW-REF |
| [5]2 | CW-25% | ||
| [5]3 | CW-50% | ||
| [5]4 | CW-75% | ||
| [5]5 | CW-100% | ||
| [5]6 | |||
| 13 | RS485 port | Connect to RS485 bus(Optional) | |
| 14 | CI Bus port | Connect to CI bus(Optional) | |
| 15 | Communication port | [4]1 | |
| [4]2 | GND | ||
| [4]3 | GND | ||
| [4]4 | +12V | ||
| [4]5 | CAN H | ||
| [4]6 | CAN L | ||
| 16 | DIP Switch | 1 VCR | Set the battery type, VCR and Mode |
| 2 Mode | |||
| 3 Bat type | |||
| 4 Bat type |
Installation
For good ventilation, ensure empty space of at least 5 cm on each side of the LMP1218-PWM unit.
Fuse specification
Here is a list for the fuses installed on LMP1218-PWM. Please also take reference of Figure 2.
Table 6 Fuse specification list
| Fuse No. | DC loads | Specification |
| F2 | Awning light | 5A |
| F3 | Pump | 7.5A |
| F4 | Auxiliarie | 10A |
| F5 | Oven | 10A |
| F6 | Lighting 1 | 10A |
| F7 | Lighting 2 | 10A |
| F9 | USB Socket Bedroom | 10A |
| F10 | USB Socket Kitchen | 10A |
| F11 | 12V Socket Kitchen | 15A |
| F12 | Permanent SAT Antenna | 10A |
| F13 | Permanent Autoradio | 5A |
| F14 | Permanent Heating System | 10A |
| F15 | Permanent TV-Demodulator | 10A |
| F16 | Lifting Bed | 25A |
| F18 | Permanent Fridge | 20A |
| F19 | Footboard | 20A |
| F20 | AUX BAT | 50A |
| F21 | Motor BAT | 50A |
| F1 | By-pass Pump | 25A |
| F8 | By-pass Lighting | 25A |
| F17 | By-pass Lifting | 25A |
OPERATION
Configuration on LMP1218-PWM
You need to set the battery type, VCR and Mode through LMP1218-PWM master power unit. 5.1.1 Dip switch setting
There are dip switches for you to set VCR mode, Working mode and Battery type.
| DIP SWITCH | 1 | 2 | 3 | 4 |
| VCR mode | Working mode | Battery type | ||
Dip switch for VCR mode and Working mode
Table 8 Dip switch for VCR mode and Working mode selection
| VCR mode | off | Built-in VCR (Default setting) |
| on | Ex-DC/DC | |
| Working mode | off | Charger (Default setting) |
| on | Power supply |
VCR mode
There are two VCR modes for optional:
- Integrated VCR: when this mode is selected, the integrated VCR is activated, i.e. 18A
- Ex-DC / DC: When this mode is selected, the integrated VCR is deactivated; and an IDM NEMO type external DC-DC booster can be connected to replace this integrated VCR
- Caution If Booster set the VCR to ON and only for LEP lithium batteries
Working mode
There are two working modes for optional:
Charger: When this mode is selected, the LMP will operate as a charger to charge the auxiliary battery as long as the grid or qualified PV is introduced
Power supply: when this mode is selected, the LMP will produce a stable voltage of 12.8 Vdc to power the connected DC loads
Dip switch for battery setting
Table 9 Dip switch for battery type setting
| Battery type | ||
| off | off | AGM |
| off | on | GEL |
| on | off | LFP |
| on | on | WET |
External Main Switch (Optional)
LMP1218-PWM offers a possibility to connect with an external main switch, which allows user to turn on/off the auxiliary battery output remotely.
Daily Maintenance
- Check and insure the nominal battery voltage is 12Vdc.
- When replacing the existing battery with a new one, please have the new battery fully charged by Grid for the first time.
Troubleshooting
LED display on LMP
Table 10 Error LED indicator of LMP
| NO. | LED | Color | Status | Description |
| 1 |
CHG / DISCHG |
Green / Orange |
Flash once per cycle | Service battery voltage low |
| 2 | Flash twice per cycle | Service battery voltage high | ||
| 3 | Flash 3 times per cycle | LMP unit Over temp | ||
| 4 | Flash 4 times per cycle | Bulk charge timeout |
Specification
| Model | LMP1218-PWM | |
| Electrical Specifications | ||
| Grid | Nominal input voltage (V) | 230±10%VAC 50/60Hz |
| Power factor | 0.98 | |
| Input current at full load | 1.3A | |
| Battery | Starter battery | 12Vdc |
| Starter battery voltage range | 12.8-14.8Vdc | |
| Service battery | 12Vdc | |
| Service battery voltage range | 10.8-16.2Vdc | |
| PV | Charger type | PWM |
| Open circuit voltage | 30Vdc | |
| Max supply current | 15A | |
| VCR | Relay specification | 12Vdc 30A continuous, peak current 50A |
| Connect voltage | 13.4V | |
| Connect delay time | 10sec | |
| Disconnect voltage | 12.8V | |
| Disconnect delay time | 60sec | |
| High voltage limit | 14.8Vdc | |
| Charger mode | Charge Algorithms | TBB premium II – 5steps |
| Battery type | AGM/GEL/LFP/WET | |
| Bulk current | 18A(Max) | |
| Absorption voltage | (14.4/14.1/14.4/14.7)±0.2Vdc | |
| Float voltage | (13.5/13.5/13.5/13.7)±0.2Vdc | |
| Power supply mode | Nominal output voltage | 12.8±0.2Vdc |
| Rated output current | 18A(Continuous) | |
| Efficiency(Max) | 88% | |
| Working temperature | -20℃~+40℃ | |
| Others | |||
| Battery Disconnect (LVD) | Disconnect voltage | AGM/GEL/WET | 10.8±0.3 Vdc |
| LFP | 11.2±0.3 Vdc | ||
| Delay off time | 60s | ||
|
Reconnect voltage |
AGM/GEL/WET | 11.8±0.3 Vdc | |
| LFP | 12.2±0.3 Vdc | ||
| Protection | Short circuit on output | Fuse blown | |
| Reverse Polarity | Fuse blown | ||
| Overload protection | Derate the output until overload is removed | ||
| Battery charger over temperature | Shut down LMP | ||
| Battery over voltage limits | Battery charger disconnect, loads disconnect | ||
| Physical Specifications | |||
| Dimensions (L*W*H) | 235 × 185 × 98.5 mm | ||
| Weight (kg) | 2kg | ||
| Enclosure | Plastic case | ||
| Cooling | By nature | ||
| Protection category | IP20 | ||
| Certification | |||
| E-mark | ECE R10 | ||
IDM Technologie
Web: www.idmtech.fr
FAQ
Q: Can I open and service the unit myself?
A: No, only qualified and authorized maintenance personnel should open and repair the unit due to the presence of dangerous voltages and high temperatures.
Documents / Resources
 |
IDSWITCH LMP1218-PWM Master Power Unit [pdf] User Manual STM250 series, LMP1218-PWM, LMP1218-PWM Master Power Unit, LMP1218-PWM, Master Power Unit, Power Unit |
