Summary of Contents for MPC DC Output Series
- Page 1 Operator’s Guide MPC‑1250 DC Output Series MPC-1250-1S Made in USA...
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Page 2: Table Of Contents
Part Numbering Scheme and Options ........................8 Electrical Characteristics ............................9 Product Specifications............................10 MPC-1250-1S 1U Mechanical Diagram ......................11 MPC Efficiency ................................12 Total Output Power that can be derived from the AC INPUT ..............13 Power Cable Wiring Diagram ..........................15 Power Cable Wire Size ............................ - Page 3 Visual indicators - External Battery Charge Level ..................30 Output Vampire Current – Unpowered ......................31 Reverse Polarity Protection ..........................31 Section V Multiple MPC Configurations Parallel Connection of DC OUTPUTS – Parallel Option ................32 N+M Redundancy - Ideal Diode ........................ 32 Configuration Cables ............................33 On/Off control –...
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Page 4: Section I
▪ Do not make contact with the terminals of the AC input connector. ▪ Always connect the cable to the MPC before it is connected to the source of AC power. ▪ Always disconnect the AC input cable from the source of AC power before disconnecting it from the MPC. -
Page 5: Hazardous Energies
THESE LEVELS SHOULD NOT BE EXCEEDED. Do not obstruct the air intake in the front of the MPC or the fan exhausts in the rear panel of the MPC while the MPC is operating. -
Page 6: General Product Information
28 V nominal DC input. The AC input has priority over the DC input. The MPC provides up to 1250 W of DC output power at 24 or 28 volts nominal. The “Constant Current” model is designed to charge lead‑acid batteries used in 28 V vehicle power applications. -
Page 7: Product Topology
As the figure below shows, there is a nominal 28 V mid‑bus within the MPC that draws power from one of up to two power sources: the AC INPUT or the DC INPUT (with that order of priority based on availability). -
Page 8: Part Numbering Scheme And Options
* Select 28 V Output option when ordering Constant Current regulation type The MPC‑1250 DC Output Series of products provide up to 1250 W of total output power (DC). Various options can be specified according to the part numbering scheme shown in the table: •... -
Page 9: Electrical Characteristics
** Regarding MIL-STD-461 CE-101, the 50 uH series inductance of a standard LISN adversely affects the input ripple of the MPC (DC input only). Such a large series source inductance (50 uH in each power lead) is not generally encountered in a 28 V DC source of such high power rating. -
Page 10: Product Specifications
Section II General Product Information Product Specifications The following three pages show the electrical and mechanical specifications of the MPC‑1250‑S‑1S Series of products. Data sheets showing these specifications and other information can be found at the web site. http://www.synqor.com/MPC MPC-1250-1S... -
Page 11: Mpc-1250-1S 1U Mechanical Diagram
Section II General Product Information MPC-1250-1S 1U Mechanical Diagram .750" 14.80" 11.750" 14.00" .750" .750" 1.50" 0.55" 0.625" 17.00" 0.313" 1.73" MILITARY POWER CONDITIONER 006-0007207 MPC-1250DC Guide Rev F 11 of 44 03/03/2022 www.synqor.com... -
Page 12: Mpc Efficiency
Section II General Product Information MPC Efficiency Figure 1 shows the typical efficiency with which the MPC‑1250 DC Output Series uninterruptible power supplies delivers power to its DC OUTPUT from a 22, 28, and 33 volts input. Efficiency vs. Output Power... -
Page 13: Total Output Power That Can Be Derived From The Ac Input
General Product Information Total Output Power that can be derived from the AC INPUT The total MPC output power for the MPC‑1250 DC Output Series is rated at 1250 W for an ambient temperature as high as 55 C (131 F). - Page 14 15 seconds before the MPC will switch over to the DC INPUT. Also note that the MPC can drive it full rated power for a 2 second interval even if the AC INPUT voltage drops...
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Page 15: Power Cable Wiring Diagram
Section II General Product Information Power Cable Wiring Diagram Looking at the rear panel, the MPC connector terminals have the following functions and locations: AC INPUT Function Line Neutral No Connect Ground DC INPUT Function G, F, E B, C, D Return A, H No Connect DC OUTPUT Function G, F, E... -
Page 16: Power Cable Wire Size
(as high as 65 A for the MPC‑1250 DC Output Series) and the voltage across it is already relatively small (as low as 22 V). In fact, a common problem that arises (when the DC INPUT cable has too small a wire) is that the voltage seen at the DC INPUT of the MPC falls below the minimum specified value of 22 V even though the voltage at the source of the DC power is greater than 22 V. - Page 17 Alternatively, a cable can have multiple pairs of wires to achieve a larger “effective wire diameter”. This second approach gives a more flexible cable. For 10 ft long cables, SynQor recommends that for the MPC‑1250 DC Output Series: • The AC INPUT cable has 3 wires (one for the ground) of 12 AWG •...
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Page 18: Operation
An example of a suitable device is a Carling Technologies, C‑series, 80 A 65 VDC, CA1‑B0‑14‑680‑321‑J circuit breaker. (www.carlingtech.com) • VERIFY that the DC INPUT cable is connected to the MPC and the source of DC power with the correct polarity. -
Page 19: Start-Up
• The front panel LEDs will either be appropriately illuminated (if one or both input power sources are present) or they will be off (if no power sources are present). • It is not necessary to move the AC BREAKER on the rear panel of the MPC to the OFF position. -
Page 20: Power Cable Connections/Disconnections While Operating
NOTE that disconnecting an input or output power cable while that cable is handling power will likely cause an arc to form as the terminals are pulled apart. This arcing is not harmful to the MPC, although if done enough times it will degrade the connector to the point where it will need to be replaced. This problem is particularly acute for the DC INPUT cable because its current is so high. -
Page 21: Cooling System
Operation Cooling System The SynQor MPC‑1250 DC Output Series products are cooled by fans that draw air into the intake below the front panel on the front panel and exhaust it out the two fan ports on the rear panel. -
Page 22: Front Panel Indicators
Front Panel Indicators To indicate the status of the MPC, there is one LED above the ON/OFF switch on the left side of the front panel of the MPC and an additional 10 LEDs on the front panel. There is also an audible alarm. - Page 23 MPC is On and the Output Voltage is Green Within Range MPC is On but the Output Voltage is Amber Out of Range MPC is Off and the Output Voltage is Within Range MPC is Off 006-0007207 MPC-1250DC Guide Rev F 23 of 44 03/03/2022...
- Page 24 Maximum MPC Temperature (Fans Running at 110%) Fan Service Required Indicator (LED in position C0) The LED in position C0 indicates whether the two cooling fans in the rear panel of the MPC are OK or if their performance is degraded, according to the table below: LED Appearance...
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Page 25: Audible Alarm
Number of Tones in Pattern Indication Load Power is greater than or approaching 100% Rated Power Fault Appears on the DC Output Three MPC Must be Turned Off and Back On to Reset Fault 006-0007207 MPC-1250DC Guide Rev F 25 of 44 03/03/2022... -
Page 26: Operating Environment
Only the redundant, water‑proof cooling fans are exposed to the environment. The MPC will shut down if it is too hot. The MPC (with cables connected or connector covers installed) has been qualified to the following requirements of MIL‑STD‑810G:... -
Page 27: Constant Current Model
Constant Current Model Overview The MPC‑1250 Family offers a model designed to charge lead‑acid batteries used in 28 V vehicle power applications. This model acts as a current source when overloaded, rather than going into a hiccup mode like the other MPC‑1250 models. Hiccup mode allows other MPC‑1250 models to deliver higher peak power, while constant current mode allows for battery charging. -
Page 28: Setting Cccv Parameters
Section IV Constant Current Model During Stage I, the battery charges with a Constant Current (CC). The MPC‑1250 can supply 47 A in constant current mode. If no loads are active, the battery will charge with 47 A. If loads are active, the battery charge current will be reduced by the load current. -
Page 29: Over Power And Over Current Protection
In addition to the 47 A current limit, the MPC‑1250 for CCCV charging has an Over Power limit. When Vset or Vtop are set above 27 V, the MPC is capable of delivering more than 1250 W. To prevent overloading the input sources, the MPC will regulate the output power to 1300 W by lowering the output voltage. -
Page 30: Entering And Exiting Charge Mode
The MPC‑1250 for CCCV charging will automatically enter and exit charge mode without user intervention. If the MPC is in current limit for at least 30 seconds, it will assume it is recharging a battery, and enter the CCCV charging cycle. The MPC will recover from current limit when the output voltage reaches Vtop. -
Page 31: Output Vampire Current - Unpowered
Note that the battery’s output voltage is only an approximate indication of the charge level. The true charge level of the battery cannot be measured by the MPC‑1250 since the MPC‑1250 cannot differentiate between current delivered to the battery and current delivered to the end‑... -
Page 32: Multiple Mpc Configurations
Multiple MPC Configurations Parallel Connection of DC OUTPUTS – Parallel Option MPC units with the regulated paralleling option can be paralleled with the proper configuration cable. Each unit transmits its output current over the configuration cable, allowing every unit to calculate the average output current. The units then trim their output voltage slightly in an attempt to deliver the average output current. -
Page 33: Configuration Cables
Section V Multiple MPC Configurations Configuration Cables Configuration cables are necessary for paralleling. They provide the following features: • Synchronized start up, shut down, and fault recovery • Digital communication for load sharing • Up to 32 units in parallel. -
Page 34: Control Interface Details
Control Interface Details Control Cable Connections There are two high‑density (three‑row) DB15 connectors located on the rear panel of the MPC: The User I/O female DB15 connector on the left is for a connection to a host/system computer so that it can control the MPC and receive information regarding the status of the MPC. -
Page 35: Internal User I/O Circuits
Remote On/O Switch SHUTDOWN 1N4148 SPDT Momentary Input Pin (ON) OFF (ON) Note: A 2PDT or 3PDT switch may be substituted for single control of 2 or 3 MPC machines, respectively. 006-0007207 MPC-1250DC Guide Rev F 35 of 44 03/03/2022 www.synqor.com... -
Page 36: Digital Input/Output Control Signals
RS232 DCE/MPC Device Receive signal RS232 DCE/MPC Device Transmit signal The RS232 port provides readback of MPC’s state, as well as the configuration and control of the MPC’s operation. The port can be used from a standard terminal interface, or from a custom computer application. -
Page 37: Ethernet Interface
Ethernet Interface The Ethernet interface provides a web page based user interface for monitoring and control of the MPC. The user can configure email alerts for MPC alarm conditions. The interface also exposes an SNMP interface compliant to RFC‑1628. The Ethernet interface supports 10BASE‑T and 100BASE‑T standards. It utilizes a standard RJ‑45 connector, also allowing a metallic sealable circular military outer housing. -
Page 38: Maintenance
Cleaning The MPC‑1250 unit has a sealed chamber for its electronics that is weather‑proof. Only the fans on the rear panel are exposed to the environment, and these fans are also weather‑proof. The unit can therefore be cleaned without concern of getting liquids inside the chamber. NOTE, however, that if the cables have been removed from the connectors the connectors should have their covers installed. -
Page 39: Trouble-Shooting Guide
Trouble-Shooting Guide Fault Conditions The SynQor MPC has no user‑serviceable parts within it (other than the fans). If it has an internal malfunction only a factory trained personnel should attempt to repair it. There are, however, several external conditions that could cause the MPC to not operate as desired. - Page 40 • The AC Breaker on the rear panel is OFF. • The AC INPUT voltage is either too low or too high. LED is a STEADY • The AC INPUT voltage is within its proper range but the MPC is not AC INPUT GREEN and not a selecting it for its source of power.
- Page 41 • One or both fans have recently had degraded performance but LED is AMBER seem to be ok now. The MPC is running a diagnostic test. Fan Service • One or both fans presently have degraded performance, even...
- Page 42 • The fans are off when the MPC is running It is normal for the fans to be off, even if the MPC is running and delivering power to the load, as long as the temperature of the MPC is low enough. If the Fan Service Required LED (C0) is green, both of the fans are OK, even if they are not running.
- Page 43 ▪ If the voltage at the DC source is close to, but still above, its 22 V minimum, but the voltage drop across the cable is large enough for the voltage at the DC INPUT of the MPC to fall below 22 V, then the MPC will determine that the DC INPUT is out of range and will shutdown.
- Page 44 Operator’s Guide MPC‑1250 DC Output Series Made in USA 006-0007207 03/03/2022 Rev F www.synqor.com 1.888.567.9596 (USA only) SynQor Headquarters 155 Swanson Road, Boxborough, MA 01719-1316 USA...
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