PMLA Series - Multi-Channel Load
The PMLA series of electronic multi-channel loads offers flexible solutions for demanding test applications with many test objects. Master and slave units are available. The master controls both its own channels and those of the slave devices. This is done either via the 4.3″ touch display for manual operation or one of the digital interfaces. The series comprises three variants: the proven standard version with up to 12 load channels, a space-saving low-power LP version with up to 72 channel with low power, and a high-power HP version with a powerful channel in a separate housing for system expansion.
A system can be configured with up to 96 load channels from devices of different variants.
Wiring example from the automotive industry for testing body control modules (BCM)
PMLA Standard
Master or Slave
- up to 3 cooling units, each with 4 mounting slots for load modules (=load channels) per device
- power classes with 150 W, 300 W, 450 W or 600 W per module
- one module occupies one (150 W), two (300 W), three (450 W) or four (600 W) mounting slots
- 4 voltage classes: 40 V, 60 V, 120 V and 240 V
- currents of 1 … 120 A
PMLA Standard: one module each for 150 W, 300 W, 450 W, and 600 W
Example: PMLA master with 3 cooling units, fully equipped with 12 load channels at 150 W
PMLA LP
Master
- up to 3 cooling units with 24 mounting slots for load modules (=load channels) per device
- power classes with 30 W, 60 W, 90 W or 120 W per module
- one module occupies one (30 W), two (60 W), three (90 W) or four (120 W) mounting slots
- 4 voltage classes: 10 V, 40 V, 60 V and 120 V
- currents of 1 … 32 A
PMLA LP: one module each for 30 W, 60 W, 90 W and 120 W
Example: PMLA LP with 3 cooling units, fully equipped with mixed load channels
PMLA HP
Slave
- one powerful channel in a 2U chassis
- for system extension
- power classes: 1400 W or 2100 W
- 3 voltage classes: 60 V, 120 V and 240 V
- currents of 16 … 180 A
PMLA HP: 1 Lastkanal mit 1400 W oder 2100 W
Model Overview
| Module | Umax | Imax | Pmax |
|---|---|---|---|
| MA15-04C30 | 40 V | 30 A | 150 W |
| MA15-06C20 | 60 V | 20 A | 150 W |
| MA15-06C5 | 60 V | 5 A | 150 W |
| MA15-12C10 | 120 V | 10 A | 150 W |
| MA15-12C2 | 120 V | 2 A | 150 W |
| MA15-24C1 | 240 V | 1 A | 150 W |
| MA15-24C5 | 240 V | 5 A | 150 W |
| MA30-04C60 | 40 V | 60 A | 300 W |
| MA30-06C10 | 60 V | 10 A | 300 W |
| MA30-06C40 | 60 V | 40 A | 300 W |
| MA30-12C20 | 120 V | 20 A | 300 W |
| MA30-12C4 | 120 V | 4 A | 300 W |
| MA30-24C10 | 240 V | 10 A | 300 W |
| MA30-24C2 | 240 V | 2 A | 300 W |
| MA45-04C90 | 40 V | 90 A | 450 W |
| MA45-06C15 | 60 V | 15 A | 450 W |
| MA45-06C60 | 60 V | 60 A | 450 W |
| MA45-12C30 | 120 V | 30 A | 450 W |
| MA45-12C6 | 120 V | 6 A | 450 W |
| MA45-24C15 | 240 V | 15 A | 450 W |
| MA45-24C3 | 240 V | 3 A | 450 W |
| MA60-04C120 | 40 V | 120 A | 600 W |
| MA60-06C20 | 60 V | 20 A | 600 W |
| MA60-06C80 | 60 V | 80 A | 600 W |
| MA60-12C40 | 120 V | 40 A | 600 W |
| MA60-12C8 | 120 V | 8 A | 600 W |
| MA60-24C20 | 240 V | 20 A | 600 W |
| MA60-24C4 | 240 V | 4 A | 600 W |
| Module | Umax | Imax | Pmax |
|---|---|---|---|
| MALP03-01C1 | 10 V | 1 A | 10 W |
| MALP03-01C2 | 10 V | 2 A | 20 W |
| MALP03-01C4 | 10 V | 4 A | 30 W |
| MALP03-01C8 | 10 V | 8 A | 30 W |
| MALP03-04C0.1 | 40 V | 0.1 A | 4 W |
| MALP03-04C0.5 | 40 V | 0.5 A | 20 W |
| MALP03-04C1 | 40 V | 1 A | 30 W |
| MALP03-04C2 | 40 V | 2 A | 30 W |
| MALP03-04C4 | 40 V | 4 A | 30 W |
| MALP03-04C8 | 40 V | 8 A | 30 W |
| MALP03-06C2 | 60 V | 2 A | 30 W |
| MALP03-12C1 | 120 V | 1 A | 30 W |
| MALP06-01C16 | 10 V | 16 A | 60 W |
| MALP06-01C8 | 10 V | 8 A | 60 W |
| MALP06-04C16 | 40 V | 16 A | 60 W |
| MALP06-04C2 | 40 V | 2 A | 60 W |
| MALP06-04C4 | 40 V | 4 A | 60 W |
| MALP06-04C8 | 40 V | 8 A | 60 W |
| MALP06-06C4 | 60 V | 4 A | 60 W |
| MALP06-12C2 | 120 V | 2 A | 60 W |
| MALP09-01C12 | 10 V | 12 A | 90 W |
| MALP09-01C24 | 10 V | 24 A | 90 W |
| MALP09-04C12 | 40 V | 12 A | 90 W |
| MALP09-04C24 | 40 V | 24 A | 90 W |
| MALP09-04C3 | 40 V | 3 A | 90 W |
| MALP09-04C6 | 40 V | 6 A | 90 W |
| MALP09-06C6 | 60 V | 6 A | 90 W |
| MALP09-12C3 | 120 V | 3 A | 90 W |
| MALP12-01C16 | 10 V | 16 A | 120 W |
| MALP12-01C32 | 10 V | 32 A | 120 W |
| MALP12-04C16 | 40 V | 16 A | 120 W |
| MALP12-04C32 | 40 V | 32 A | 120 W |
| MALP12-04C4 | 40 V | 4 A | 120 W |
| MALP12-04C8 | 40 V | 8 A | 120 W |
| MALP12-06C8 | 60 V | 8 A | 120 W |
| MALP12-12C4 | 120 V | 4 A | 120 W |
| Moduls | Umax | Imax | Pmax |
|---|---|---|---|
| MAHP140-06C120 | 60V | 120 A | 1400 W |
| MAHP140-12C60 | 120 V | 60 A | 1400 W |
| MAHP140-24C32 | 240 V | 32 A | 1400 W |
| MAHP210-06C180 | 60V | 180 A | 2100 W |
| MAHP210-12C90 | 120 V | 90 A | 2100 W |
| MAHP210-24C48 | 240 V | 48 A | 2100 W |
Operating Modes
Each channel has the basic operating modes constant current, constant voltage, constant resistance, and constant power (CC, CV, CR, CP mode). In addition, a protection value for voltage or current can be specified in each operating mode. This results in the combined operating modes CC+CV, CP+CV, CR+CV, CP+CC, CR+CC, CV+CC.
In addition to the static operating modes, dynamic operation is possible with the LIST function or with MPP tracking.
Functions
Channel groups are used to set settings efficiently and simultaneously for multiple channels. There are channel groups 1 to 10, whereby any subset of the available channels can be assigned to a channel group. Channel group 10 contains all available channels in the system. A channel can belong to multiple (even all) groups.
See Application Note 14 for more details.
The Maximum Power Point Tracking (MPPT) function is used to test solar or photovoltaic modules. To do this, the maximum power point (MPP) of the connected test object is controlled on the respective channel.
For testing energy storage devices such as batteries, ultracaps, or capacitors, each channel can discharge a connected test object statically or with defined load profiles until one or more stop criteria are met. IUa discharge is also possible, in which the device is discharged with a constant current until a minimum voltage is reached. This voltage is then kept constant by reducing the current until a defined current value is undershot. Stop criteria are charge, energy, time, current, and voltage.
Each channel can simulate load profiles in all operating modes CC, CV, CR, CP using the LIST function. Each setting has a dwell time and a ramp time.
Voltage and current are measured synchronously and stored with a time stamp. Individual sampling times can be defined for each curve section.
An adjustable watchdog function protects the device under test by switching off the load input in the event of communication failure with the control computer.
For certain devices under test or very long connection cables, it may be necessary to adjust the control time constant of the electronic load in order to achieve stable operation. The control speed can be switched for this purpose.
In digital remote control mode, all channels can independently store voltage and current with time stamps at variable intervals. When the data memory is full, recording can either be stopped or the old data can be overwritten using the ring buffer principle. Large amounts of data can be transferred in binary block format.
I/O Port
Standard and HP variants feature a standard I/O port with control and measurement signals for each channel:
- analog load setting for I and U in real time, for P and R software-controlled
- load activation
- analog voltage monitoring output
- analog current monitoring output
- sense inputs
The sense connections are also available on the LP variant.
Protection and Limitation
Protection units:
- overcurrent protection
- overpower protection
- overtemperature protection
- overvoltage monitor
- undervoltage protection
Overcurrent and undervoltage protection:
Either an undervoltage or an overcurrent protection can be activated and set. The active limit value is effective in all operating modes. The undervoltage protection operates in two modes:
- regulating transition with slow control (e.g., battery discharge)
Switching transition with fast control - (short dead time, e.g., when voltage is switched on)
Triggering und Synchronization
In digital remote control mode, the trigger model ensures that all channels are switched on synchronously or that programmed waveforms are started simultaneously on all selected channels or, respectively, channel groups.
The H&H SyncroLink cable can be used to reduce delays between multiple H&H devices to a minimum.
Applications and Test Objects
Applications
- Adjusting driver outputs (control unit)
- Burn-in applications
- Simulation of consumers in the vehicle electrical system
Test Objects
- batteries and accumulators
- DC/DC converters
- power supply units
- power control units
- control units
- zone controllers
- electronic assemblies
- sensors
- wiring harnesses
- power distribution units
- fuse boxes
- e-fuses
Cooling and Mechanics
Multi-stage temperature-controlled fans provide cooling for the devices. The airflow from the front panel to the rear panel allows compact cabinet systems with many devices to be built without gaps. Mounting brackets are included as standard.
Calibration
A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.
Conditions for a second free calibration
For use under laboratory conditions, H&H recommends a calibration interval of 2 years. This is an empirical value that can be used as a guide for the first period of use. Depending on the intended use, service life, relevance of the application and ambient conditions, the operator should adjust this interval accordingly
Downloads
Manuals
Software/Drivers
Applications
Comparison H&H Loads
Automotive
Rail
Renewable Energy
Research and Development
Automation
Medicine
Aviation
Manufacturing and Process Industry
Thank you for your interest in our products!
In order to suggest a suitable configuration for your multi-channel system, we require the following information:
Number of channels:
Maximum voltage:
Maximum current:
Maximum power:
Example: 24 channels with 5 V / 5 A / 20 W, 3 channels with 12 V / 4 A / 40 W
Our team will then contact you with suitable advice.
Thank you and see you soon!