Sens MicroGenius S2 User manual

SENS MicroGenius S2/S4 Technical Manual
1
Installation & Operation Manual
PATENTED US 9,270,140; 9,385,556; 9,413,186; 9,509,164;
9,466,995; 9,948,125
Installation or service questions?
Call SENS between 8 a.m. and 5 p.m. (Mountain Time),
Monday through Friday, or visit our website.
Copyright © Stored Energy Systems LLC 2018
The SENS name / logo, MicroGenius, HELIX, and Dynamic Boost are trademarks of Stored Energy Systems LLC
SENS Part Number: 101330
Document Revision: F
DCN Number: 107594
Date: February 22, 2019
1840 Industrial Circle
Longmont, CO 80501
Phone:
303.678.7500
800.742.2326
Fax:
303.678.7504
Email:
[e-mail]
Web:
www.sens-usa.com
Automatic Battery Charger/Power Supply

SENS MicroGenius S2/S4 Technical Manual
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TABLE OF CONTENTS
1IMPORTANT SAFETY INSTRUCTIONS FOR INSTALLER AND OPERATOR................................................................................ 3
2MODEL NUMBER BREAKOUT................................................................................................................................................. 5
3PERFORMANCE SPECIFICATIONS ........................................................................................................................................... 6
4SYSTEM OVERVIEW.............................................................................................................................................................. 10
5MOUNTING INSTRUCTIONS ................................................................................................................................................. 13
5.1. Mounting Location .....................................................................................................................................................13
5.2. Mounting Instructions................................................................................................................................................13
6SETUP AND WIRING ............................................................................................................................................................. 14
6.1. Wire Ratings and Sizes ...............................................................................................................................................14
6.2. Grounding Instructions and Connection ....................................................................................................................15
6.3. DC Connection............................................................................................................................................................15
6.4. AC Connection............................................................................................................................................................17
6.5. Alarm Connections.....................................................................................................................................................17
6.6. Remote Temperature Sensor Connection—Optional ................................................................................................19
6.7. SAE J1939 Communications Setup (CANbus) .............................................................................................................20
6.8. Modbus Communications Setup ................................................................................................................................21
6.9. Load Share Connection—Optional .............................................................................................................................22
6.10. Remote Alarm/Communications Panel Accessory Connection—Optional ................................................................23
6.11. Verify Connections .....................................................................................................................................................23
7START-UP PROCEDURE......................................................................................................................................................... 23
7.1. Connect Battery/Outputs...........................................................................................................................................23
7.2. Verify Configuration ...................................................................................................................................................23
7.3. Apply AC Input Voltage ..............................................................................................................................................24
7.4. Power Off ...................................................................................................................................................................24
8ALARMS, LEDS AND DISPLAY ............................................................................................................................................... 24
8.1. LED Indicators.............................................................................................................................................................24
8.2. Individual Alarm Relay Contacts.................................................................................................................................25
8.3. LCD Panel ...................................................................................................................................................................26
8.4. Alarm Definitions .......................................................................................................................................................26
9OPERATION .......................................................................................................................................................................... 32
9.1. Charging Algorithms................................................................................................................................................... 32
9.2. Float Mode .................................................................................................................................................................33
9.3. Dynamic Boost™ Mode ..............................................................................................................................................33
9.4. HELIX Mode................................................................................................................................................................34
9.5. Ultracapacitor Mode ..................................................................................................................................................34
9.6. Charging Low or Zero-volt Batteries...........................................................................................................................34
9.7. Commissioning Batteries............................................................................................................................................35
9.8. Battery Check ............................................................................................................................................................. 35
9.9. Restore Factory Defaults............................................................................................................................................35
9.10. Keypad Operation ......................................................................................................................................................36
9.11. Configuration with SENS Setup Utility........................................................................................................................40
9.12. Temperature Compensation ......................................................................................................................................40
9.13. Load Share Charger Operation...................................................................................................................................41
9.14. Remote Alarm/Communications Panel Accessory .....................................................................................................42
10 J1939 COMMUNICATIONS ................................................................................................................................................... 42
10.1. J1939 Data Messages .................................................................................................................................................42
11 MODBUS COMMUNICATIONS............................................................................................................................................. 43
11.1. TCP/IP Modbus........................................................................................................................................................... 43
11.2. Modbus Holding Registers .........................................................................................................................................44
11.3. Status Definition.........................................................................................................................................................54
11.4. Alarm Bit Definition....................................................................................................................................................54
11.5. Extended Status Bit Definition ...................................................................................................................................55
11.6. Writable Control Flags (Coils).....................................................................................................................................56
12 TROUBLESHOOTING/ERROR CODES .................................................................................................................................... 57
12.1. Configuration Error Codes..........................................................................................................................................57
12.2. Troubleshooting .........................................................................................................................................................59
13 GLOSSARY............................................................................................................................................................................. 63

SENS MicroGenius S2/S4 Technical Manual
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1IMPORTANT SAFETY INSTRUCTIONS FOR INSTALLER AND OPERATOR
1.1. SAVE THESE INSTRUCTIONS – This manual contains important safety and operating instructions for
MicroGenius® S2 and S4 battery chargers.
1.2. Before using battery charger, read all instructions and cautionary markings on battery charger, battery, and
product using battery.
1.3. Do not expose charger to rain or snow.
1.4. Use of an attachment not recommended or sold by the battery charger manufacturer may result in a risk of
fire, electric shock, or injury to persons.
1.5. This charger is intended for commercial and industrial use. ONLY TRAINED AND QUALIFIED PERSONNEL
MAY INSTALL AND SERVICE THIS UNIT.
1.6. Do not operate charger if it has received a sharp blow, been dropped, or otherwise damaged in any way;
shut off power at the branch circuit protectors and have the unit serviced or replaced by qualified
personnel.
1.7. To reduce risk of electric shock, disconnect the branch circuit feeding the charger before attempting any
maintenance or cleaning. Turning off controls will not reduce this risk.
1.8. WARNING – RISK OF EXPLOSIVE GASES
1.8.1. WORKING IN THE VICINITY OF A LEAD-ACID OR NICKEL-CADMIUM BATTERY IS DANGEROUS.
STORAGE BATTERIES GENERATE EXPLOSIVE GASES DURING NORMAL BATTERY OPERATION. FOR
THIS REASON, IT IS OF UTMOST IMPORTANCE THAT YOU READ THIS MANUAL AND FOLLOW THE
INSTRUCTIONS EACH TIME YOU USE THE CHARGER.
1.8.2. To reduce the risk of battery explosion, follow these instructions and those published by the battery
manufacturer and the manufacturer of any equipment you intend to use in the vicinity of a battery.
Review cautionary markings on these products and on the engine.
1.9. PERSONAL PRECAUTIONS
1.9.1. Someone should be within range of your voice or close enough to come to your aid when you work
near a storage battery.
1.9.2. Have plenty of fresh water and soap nearby in case battery electrolyte contacts skin, clothing, or
eyes.
1.9.3. Wear complete eye protection and clothing protection. Avoid touching eyes while working near a
storage battery.
1.9.4. If battery electrolyte contacts skin or clothing, wash immediately with soap and water. If electrolyte
enters eye, immediately flood the eye with running cold water for at least 10 minutes and get
medical attention immediately.
1.9.5. NEVER smoke or allow a spark or flame in vicinity of battery or engine.
1.9.6. Be extra cautious to reduce risk of dropping a metal tool onto the battery. It might spark or short
circuit the battery or another electrical part that may cause explosion. Using insulated tools reduces
this risk, but will not eliminate it.
1.9.7. Remove personal metal items such as rings, bracelets, necklaces, and watches when working with a
storage battery. A storage battery can produce a short circuit current high enough to weld a ring or
the like to metal, causing a severe burn.
1.9.8. When charging batteries, charge 6 and 12 cell LEAD-ACID or 10 and 20 cell LIQUID ELECTROLYTE

SENS MicroGenius S2/S4 Technical Manual
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NICKEL-CADMIUM batteries only, with rated capacity of 30 to 1100 Ampere hours.Charger
certified for fire pump and emergency generator applications. For a 24 hour recharge time do not
exceed 220 Ampere hours of capacity per 12A charger output current. Do not use this battery
charger to supply power to an extra-low voltage electrical system or to charge any type of non-
rechargeable, dry cell, alkaline, lithium, nickel-metal-hydride, or sealed nickel-cadmium batteries
that are commonly used with home appliances. These batteries may burst and cause injuries to
persons and damage to property.
1.9.9. NEVER charge a frozen battery.
1.9.10. The charger contains a DC output fuse for internal fault protection, but this will not protect the DC
wiring from fault currents available from the battery. Consult national and local ordinances to
determine if additional battery fault protection is necessary in your installation.
1.10. Preparing Battery For Charge
1.10.1. Be sure area around battery is well ventilated while battery is being charged.
1.10.2. Ensure battery terminals are clean and properly tightened. Be careful to keep corrosion from
coming in contact with eyes.
1.10.3. Add distilled water in each cell until battery acid reaches level specified by battery manufacturer.
Do not overfill. For a battery without removable cell caps, such as valve regulated lead acid
batteries, carefully follow manufacturer’s recharging instructions.
1.10.4. Study all battery manufacturer specific precautions such as removing or not removing cell caps
while charging and recommended rate of charge. The recommended charge current range must
include the rated output current of the charger.
1.11. Charger Location
1.11.1. Locate the charger as far away from the battery as DC cables permit.
1.11.2. Never place the charger directly above or below the battery being charged; gases from the battery
will corrode and damage charger.
1.11.3. Never allow battery acid to drip on charger when reading electrolyte specific gravity or filling
battery.
1.11.4. Do not operate charger in a closed-in area or restrict ventilation in any way.
1.11.5. Do not set anything on top of the charger.

SENS MicroGenius S2/S4 Technical Manual
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2MODEL NUMBER BREAKOUT
S
4
-
C
1
0
-
H
0
0
0
0
0
0
0
A
B
C
D
E
F
G
H
I
J
K
L
M
Field
Parameter
Code
Value
A
Product Family
S
MicroGenius S
B
Enclosure
2
S2 chassis
4
S4 chassis
C
Output
and Protection
Options
A
Single output, no breakers
B
Single output, AC and DC breakers (S4 only)
C
Single output, AC/DC breakers with supplemental surge (S4 only)
D
Multiple output, single ground, no breakers
E
Multiple output, single ground, AC breaker (S4 only)
F
Multiple output, single ground, AC breaker, surge (S4 only)
D
Communications
0
J1939 and Modbus RS-485
1
J1939, Modbus TCP/IP, native SENSbus USB
2
J1939 and Modbus RS-485 with RJ-45 to terminal block adapter
3
J1939, Modbus TCP/IP, USB, & RJ45 to terminal block adapter
E
Configuration
0
Standard
R
19in rack mount ears (S4 only)
T
23in rack mount ears (S4 only)
F
Output A Code
X
See output code table
G
Output A Redundancy
X
See redundancy code table
H
Output B Code
X
See output code table
I
Output B Redundancy
X
See redundancy code table
J
Output C Code
X
See output code table
K
Output C Redundancy
X
See redundancy code table
L
Output D Code
X
See output code table
M
Output D Redundancy
X
See redundancy code table
OUTPUT CODE
REDUNDANCY CODE
CODE
VOLTAGE
CURRENT
CASE
CODE
REDUNDANCY
0
N/A
N/A
N/A
0
N + 0
A
12 / 24V
15A
S4
1
N + 1
B
12 / 24V
20A
S2
2
N + 2
D
12 / 24V
30A
S2/S4
F
12 / 24V
45A
S4
H
12 / 24V
60A
S4

SENS MicroGenius S2/S4 Technical Manual
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3PERFORMANCE SPECIFICATIONS
MicroGenius® S2/S4 is a switchmode, regulated, filtered, microprocessor-controlled, current limited battery
charger designed for heavy-duty industrial service. Chargers may be configured for three primary applications: 1)
DC power and standby battery charging for industrial control and safety systems, 2) DC power supply and battery
charging for marine environments and 3) quick recharge and long life maintenance of engine start batteries. The
charger is provided in two enclosure sizes (S2 and S4) and with various output options. Every model provides
Modbus and J1939 communications, 5 alarm relays, easily readable alpha-numeric display and keypad. Optional
features include breakers, supplemental surge protectors, TCP/IP Modbus with native USB, IP22 drip shield as well
as multiple outputs configured to different output voltages. Charger specifications are detailed in the table below,
see following sections for installation and operation instructions.
Table 1 – Specifications
AC Input
Voltage, Frequency
90-265 VAC , 47-63 Hz
Input Current
S2: 8 Amps maximum (at 100 VAC)
S4: 16 Amps maximum (at 100 VAC)
Protection
Supplementary overcurrent protection fuse (non-replaceable);
transient protected to EN61000-4-5 level 4
2-pole circuit breaker (optional with S4)
Supplemental surge protection (optional with S4). Surge protective
device is field replaceable.
Efficiency
Up to 93%; meets CA Energy Commission (CEC) Title 20 Appliance
Efficiency Regulations
Power factor
>.95 typical at maximum rated load current and boost charge voltage
DC output
Voltage
12/24V nominal; multiple output assignments (optional); adjustable
from 0-34V using front panel keypad or computer to charger
cable/native USB (optional) and SENS Setup Utility Kit (SENS p/n
209254 plus SENS software available at www.sens-usa.com)
Current
15-60 Amps, see section 2. Output power reduced by approximately
20% for output voltages greater than 24 VDC when input voltage is
less than 170 VAC.
Soft start
Charger gradually increases current with a maximum of 5 seconds to
full-required output
Charging modes
Multi-stage, including float, boost and commissioning charge modes
Battery type programs
Flooded lead-acid, AGM, Ni-Cd, VRLA, ultracapacitor
DC power supply
operation
Delivers fast-responding, stable, well-filtered DC without battery
Current limit
100% current capability subject to temperature limits and AC voltage
limits; field adjustable
Charging characteristic
Constant voltage, current limited; patented Dynamic Boost control
Line/load regulation
+0.5%
Output ripple
<30mVrms with or without battery
Battery temperature
compensation
On-board sensor controls changes in output voltage when
temperature is between 0°C and +40°C at a rate of – 0.18% per
degree C; optional remote battery temperature probe (SENS p/n
209481); remote temperature probe connections provided for each
output
Output protection
Current limit, supplementary overcurrent protection fuse (non-
replaceable), transient protected
2-pole circuit breaker (optional with S4)
Supplemental surge protection (optional with S4). Surge protective

SENS MicroGenius S2/S4 Technical Manual
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device is field replaceable.
Dead battery charge
Starts into and recharges zero volt battery without user intervention
Parallel/Load Share
operation
Two or more load-sharing chargers operate with all modes
synchronized for increased current or fault tolerance, requires
standard RJ-45 network cable to connect paralleling bus (SENS p/n
208118-72 for 72-inch length or p/n 208118-180 for 180-inch length)
Load Dump protection
Output voltage over-shoot is limited to 15% to prevent damage to
connected devices if battery is disconnected while charger is
operating
Output Blocking
protection
Prevents sparking during battery connection when battery is first
connected to charger; serves as an "OR" diode to isolate a non-
functioning charger from others in a redundant charger configuration
Adjustment
& Controls
Charge mode control
Fully automatic patented Dynamic Boost system. Manual boost and
battery commissioning available from keypad.
Keypad adjustment
Enable or change all settings from front panel
Computer adjustment
Change or customize settings from computer using computer to
charger cable/native USB (optional) and SENS Setup Utility Kit (SENS
p/n 209254 plus SENS software available at www.sens-usa.com)
Status
display
LEDs
Two multi-color front panel status LEDs
Digital metering
DC voltmeter accurate to +2%; DC ammeter to +5%. AC input voltage is
for reference only. If AC waveform is not sinusoidal or is distorted the
AC voltage will not be reported accurately.
Status messages
20-character display of status and alarm messages
Alarms
Alarms
Factory set and field reconfigurable.
Output via network
Alarms available via either J1939 or Modbus ports. Alarm indication
delayed by configured alarm delay value.
Form C contacts
Five Form C contacts, each rated 30VDC/VAC, 2A resistive, assignable
at factory, using keypad or using SENS Setup Utility. Alarm indication
delayed by configured alarm delay value.
Alarm Delay
30 seconds by default, programmable between 5 to 60 seconds using
keypad or SENS Setup Utility. Alarm indication delayed for
communications ports and relay contacts, LED indication not delayed.
Networking
J1939 communications
CAN 2.0 extended ID on RJ-45 port
Modbus
communications
Modbus RS-485 on RJ-45 port, Modbus TCP/IP (optional) on RJ-45
port
SENSbus
Proprietary bus for connection of paralleled chargers and SENS
accessories
Environ-
mental
Operating temperature
-40°C to +70°C; meets full specification from-40°C to +40°C
LCD: display may be unreadable and life reduced above 65°C
Cooling
Natural convection cooled
Storage temperature
-40°C to +70°C
Cold Start
Cold starts down to -40°C. Requires approximately five seconds
additional time to start at temperatures below -20°C.
Humidity
5% to 95%, non-condensing
Water ingress
IP20; IP 22/NEMA 3R with optional drip shield (SENS p/n 209291 for
S2 and 209287 for S4)
Vibration
Swept Sine (EN60068-2-6): 4G, 18-500 Hz, 3 primary axes
Random: 20-500Hz, .01G2/Hz
Shock
EN 60068-2-27 (15G)
Electrical transient
ANSI/IEEE C62.41 and EN 61000-4-12 on power terminals

SENS MicroGenius S2/S4 Technical Manual
8
Abuse
protection
Reverse polarity
Charger self-protects without fuse clearing; indication via LED and
LCD; charger recovers automatically after removal of fault condition
Wrong voltage battery
Charger-battery voltage mismatch shuts down charger after 5
minutes; indication via LED and LCD
Overvoltage shutdown
Selective; shutdown only operates if charger causes the overvoltage
condition. Overvoltage caused by an external voltage source does not
shut down the charger.
Over temperature
protection
Gradual output power reduction if heatsink temperature becomes
excessive
Regulatory
compliance
North America
C-UL-US Listed: CSA 22.2, No. 107.2; UL 1012, File E114117, category
QQIJ; UL 1236, File E109740 for category BBGQ and File EX6409 for
categories BBHH, BBJY and QWIR; certified to UL 1236 supplements
SB (marine), SC (fire pump) and SE (emergency generator)
NFPA-70; NFPA-110 when annunciating to the genset control panel
the charger’s output voltage, current, and alarm status via J1939 or
with alarm relays
FCC: Part 15, Class A commercial use and ICES-003 (Canada).
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
Seismic: rigid and non-structure wall mount; max S
DS
of 2.5G; IBC
2000-2015; California BC 2007-2016
American Bureau of Shipping: Type Approved
California Energy Commission: Title 20 Appliance Efficiency
Regulations
European Union (CE)
EMC: 2014/30/EU
EN 61000-6-4 (Emissions – Class A)
CISPR 11 – Class A
EN 61000-6-2 (Immunity – Industrial Environments)
EN 61000-4-2 Electro Static Discharge 4 kV contact, 8 kV air
EN 61000-4-3 Radiated Immunity – at 10V/m
EN 61000-4-4 Electrical Fast Transients – 2kV AC, 1kV I/O
EN 61000-4-5 Surge Immunity – 2 kV cm, 1 kV diff
EN 61000-4-6 Conducted power line immunity – 10 V r.m.s.
EN 61000-4-8 Power frequency magnetic field testing – 30 A/m
EN 61000-4-11 Voltage dips and interruptions – per the standard
LVD: 2014/35/EU
EN 60335-1 & EN 60335-2-29
RoHS 2: 2011/65/EU
EN 50581
WEEE: 2012/19/EU
This charger is considered electrical and electronic equipment (EEE)
for non-household use and should be recycled accordingly. Do not
dispose as unsorted municipal waste. See SENS website (www.sens-
usa.com) for information on how to properly recycle.
Construction
Housing/configuration
Aluminum with powder coated finish
S2 case size: includes three ¾ inch conduit opening
S4 case size: includes one each ¾ inch, 1 inch and 1-¼ inch conduit

SENS MicroGenius S2/S4 Technical Manual
9
openings
S4 case size: rack mount brackets for 19 and 23 inch racks (optional)
Dimensions
See drawings and dimensions at back of manual
Weight
S2 case size: 13 lbs (5.9 kg) maximum
S4 case size: 32 lbs (14.5 kg) maximum
Connections
AC and DC terminal blocks or breakers (optional), see section 6 for
allowed wire gauges
J-1939 and Modbus: RJ-45
Form C alarms terminal block plug: 28 to 16 AWG

SENS MicroGenius S2/S4 Technical Manual
10
4SYSTEM OVERVIEW
Diagrams follow to demonstrate multiple configurations.
Figure 1 – S2 Model
REMOVE PLUGGABLE ALARM
TERMINAL BLOCKS TO INSTALL
ALARM WIRES
28–16 AWG (0.08–1.5 mm2)
Tighten to 2.0 In-Lb (0.22 Nm)
See inside cover label for
factory alarm assignments
CONNECT RS-485
MODBUS OR J1939
TO RJ-45
CONNECT AC WIRES AT
TERMINAL BLOCKS
20–6 AWG (0.5–13.5 mm2)
Tighten to 10.5 In-Lb (1.2 Nm)
CONNECT REMOTE
TEMPERATURE SENSORS
One sensor per output
28–16 AWG (0.08–1.5 mm2)
Tighten to 2.0 In-Lb (0.22 Nm)
SENSbus – CONNECT CHARGER
LOAD SHARING CABLE,
REMOTE ACCESSORIES OR
SENS SETUP UTILITY TO RJ-45
CONNECTOR
CONNECT GROUND WIRE
28–16 AWG (0.08–1.5 mm2)
Tighten to 50 In-Lb (5.6 Nm)
CONNECT TCP/IP
MODBUS TO RJ-45
CONNECTOR (optional)
MULTIPLE OUTPUTS
OPTIONAL
(outputs share common
negative connection)
KEYPAD AND LCD
Adjustments, status and
alarms
AC STATUS LED
DC STATUS LED
MOUNT CHARGER VERTICALLY
Use four ¼ inch (M6)
screws to mount charger,
fasteners supplied by installer
CONNECT DC WIRES AT
TERMINAL BLOCKS
20–2 AWG (0.5–35 mm2)
Tighten to:
≤#4: 22 In-Lb (2.5 Nm)
>#4: 40 In-Lb (4.5 Nm)
See inside cover label for
factory output configuration
CONNECT SENS SETUP
UTILITY TO USB WHEN
OPTIONAL TCP/IP PCA
INCLUDED

SENS MicroGenius S2/S4 Technical Manual
11
Figure 2 – S4 Single Output with Breakers
CONNECT DC WIRES AT
BREAKER TERMINALS
<50A: 14–2 AWG (2.5–35 mm2)
≥50A: 12 AWG–2/0 (4–70 mm2)
Tighten to 45 In-Lb (5.1 Nm)
See inside cover label for
factory output configuration
KEYPAD AND LCD
Adjustments, status and
alarms
REMOVE PLUGGABLE ALARM
TERMINAL BLOCKS TO INSTALL
ALARM WIRES
28–16 AWG (0.08–1.5 mm2)
Tighten to 2.0 In-Lb (0.22 Nm)
See inside cover label for
factory alarm assignments
CONNECT RS-485
MODBUS OR J1939
TO RJ-45
CONNECT AC WIRES AT
BREAKER TERMINALS
14–2 AWG (2.5–35 mm2)
Tighten to 43 In-Lb (4.9 Nm)
CONNECT REMOTE
TEMPERATURE SENSOR
28–16 AWG (0.08–1.5 mm2)
Tighten to 2.0 In-Lb (0.22 Nm)
SENSbus – CONNECT CHARGER
LOAD SHARING CABLE,
REMOTE ACCESSORIES OR
SENS SETUP UTILITY TO RJ-45
CONNECTOR
DO NOT CONNECT AT
TERMINAL BLOCK WHEN
BREAKER PRESENT
CONNECT GROUND WIRE
28–16 AWG (0.08–1.5 mm2)
Tighten to 50 In-Lb (5.6 Nm)
CONNECT TCP/IP
MODBUS TO RJ-45
CONNECTOR (optional)
DO NOT CONNECT AT
TERMINAL BLOCK WHEN
BREAKER PRESENT
AC STATUS LED
DC STATUS LED
MOUNT CHARGER
VERTICALLY
Use four ¼ inch (M6)
screws to mount charger,
fasteners supplied by
installer
CONNECT SENS SETUP
UTILITY TO USB WHEN
OPTIONAL TCP/IP PCA
INCLUDED

SENS MicroGenius S2/S4 Technical Manual
12
Figure 3 – S4 Single/Multiple Output without Breakers
CONNECT DC WIRES AT
TERMINAL BLOCKS
14 AWG–2/0 (2.5–70 mm2)
Tighten to:
#6-2/0: 120 In-Lb (13.5 Nm)
#8: 40 In-Lb (4.5 Nm)
#14-#10: 35 In-Lb (4.0 Nm)
See inside cover label for
factory output configuration
REMOVE PLUGGABLE ALARM
TERMINAL BLOCKS TO INSTALL
ALARM WIRES
28–16 AWG (0.08–1.5 mm2)
Tighten to 2.0 In-Lb (0.22 Nm)
See inside cover label for
factory alarm assignments
CONNECT RS-485
MODBUS OR J1939
TO RJ-45
CONNECT AC WIRES AT
TERMINAL BLOCKS
14–2 AWG (2.5–35 mm2)
Tighten to:
#3-#2: 50 In-Lb (5.6 Nm)
#6-4: 45 In-Lb (5.1 Nm)
#8: 40 In-Lb (4.5 Nm)
#14-#10: 35 In-Lb (4.0 Nm)
CONNECT REMOTE
TEMPERATURE SENSORS
One sensor per output
28–16 AWG (0.08–1.5 mm2)
Tighten to 2.0 In-Lb (0.22 Nm)
SENSbus – CONNECT
CHARGER LOAD SHARING
CABLE, REMOTE ACCESSORIES
OR SENS SETUP UTILITY TO
RJ-45 CONNECTOR
CONNECT GROUND WIRE
28–16 AWG (0.08–1.5 mm2)
Tighten to 50 In-Lb (5.6 Nm)
CONNECT TCP/IP
MODBUS TO RJ-45
CONNECTOR (optional)
MULTIPLE OUTPUTS
OPTIONAL
(outputs share common
negative connection)
KEYPAD AND LCD
Adjustments, status and
alarms
AC STATUS LED
DC STATUS LED
MOUNT CHARGER VERTICALLY
Use four ¼ inch (M6)
screws to mount charger,
fasteners supplied by installer
CONNECT SENS SETUP
UTILITY TO USB WHEN
OPTIONAL TCP/IP PCA
INCLUDED

SENS MicroGenius S2/S4 Technical Manual
13
5MOUNTING INSTRUCTIONS
INSTALLATION OF THE UNIT MUST COMPLY WITH LOCAL ELECTRICAL CODES AND OTHER APPLICABLE
INSTALLATION CODES AND BE MADE ACCORDING TO THE INSTALLATION INSTRUCTIONS AND ALL
APPLICABLE SAFETY REGULATIONS.
Printed circuit boards contain static sensitive components. Damage can occur even when static levels are too
low to produce a noticeable discharge shock. To avoid static discharge damage, handle the charger by the
chassis only. Remove the cover only when access is essential for installation and service, and replace it
promptly when finished.
5.1. Mounting Location
The charger is provided in two different enclosure sizes, S2 and S4. See diagrams at back of manual for
dimensions and mounting information.
5.1.1. Charger is rated IP22 with optional drip shield installed.
5.1.2. Charger will operate at full specification when located where temperatures are within -40°C
(-40°F) to +40°C (104°F). Output power is gradually reduced at higher temperatures.
5.1.3. Mount charger vertically to ensure adequate ventilation.
5.1.4. Leave clear space for ventilation all around the charger: at least 6 inches (15 cm) at the top; at
least 4 inches (10.16 cm) at the bottom; at least 0.5 inches (1.27 cm) on each side. Operating
temperature ranges stated above assume stated clearances.
5.1.5. Mount to a wall or other vertical support. The mounting surface must safely support the weight of
the charger and the fixed wiring. S2 chargers have a maximum weight of 13 lbs (5.9 Kg). S4
chargers have a maximum weight of 32 lbs (14.5 Kg).
5.1.6. Allow sufficient room for routing the fixed wiring to the charger. All wires enter the charger from
the bottom. See diagrams at back of manual for further information.
5.1.7. Do not mount the charger above any heat generating equipment.
5.2. Mounting Instructions
5.2.1. Drill four wall mounting holes using dimensions provided on diagrams at back of manual.
IMPORTANT: Protect charger from all drill shavings!
5.2.2. Rack mount brackets (19 inch and 23 inch) are optional for the S4 enclosure size. Mount brackets
to charger as shown on diagrams at back of manual before mounting charger in rack.
5.2.3. Mount the charger before connecting AC, DC, communications and alarm wiring to ensure un-
obstructed access to mounting holes.
5.2.4. Mount the charger using four ¼ inch (M6) screws with standard flat washers. Mounting hardware
is not included with the charger and must be provided by the installer.

SENS MicroGenius S2/S4 Technical Manual
14
6SETUP AND WIRING
IMPORTANT! The charger is configured at the factory and typically requires no adjustments before operating.
Refer to the label on the inside lower cover for factory configured output and alarm relay assignments. The
charger may be reconfigured using the front panel keypad or by software programming using the SENS Setup
Utility.
All wiring must comply with applicable codes and local ordinances.
WARNING:
ENSURE THAT AC POWER IS DISCONNECTED AT A CIRCUIT BREAKER
OR OTHER SAFETY DISCONNECT BEFORE WIRING THE CHARGER
6.1. Wire Ratings and Sizes
6.1.1. All power conductors should be rated for use at 90°C or higher and 400V or higher. Alarm relay
conductors and communications data cable should be rated for use at 75°C or higher.
6.1.2. Coordinate the AC input conductor size with the customer-provided branch circuit protection
device.
6.1.3. For best performance and recharge time, refer to the following table to determine the
appropriate output conductor gauge and length. Use of a remote temperature sensor (SENS p/n
209481, see section 9.12) is highly recommended for best charging performance.
Table 2 – DC Output Cable Size
Charger Rated
Output Current
(Amps)
Wire Size
Resistance
per Foot
(mΩ/Ft.)
Maximum Charger to
Battery Distance (Ft.)
AWG
mm2
12V
24V
15
14
2.5
2.50
6
12
12
4.0
1.60
10
20
10
6.0
1.00
17
34
8
10
0.63
26
52
6
16
0.40
42
84
20
14
2.5
2.5
5
10
12
4
1.6
8
16
10
6
1
13
26
8
10
0.63
20
40
6
16
0.4
31
62
25
14
2.5
2.5
4
8
12
4
1.6
6
12
10
6
1
10
20
8
10
0.63
16
32
6
16
0.4
25
50
30
14
2.5
2.5
3
6
12
4
1.6
5
10
10
6
1
8
16
8
10
0.63
13
26
6
16
0.4
21
42
4
25
0.25
33
66
2
35
0.16
52
104
35
14
2.5
2.5
3
6
12
4
1.6
4
8
10
6
1
7
14

SENS MicroGenius S2/S4 Technical Manual
15
8
10
0.63
11
22
6
16
0.4
18
36
4
25
0.25
29
58
2
35
0.16
45
90
45
10
6
1
6
12
8
10
0.63
9
18
6
16
0.4
14
28
4
25
0.25
22
44
2
35
0.16
35
70
50
10
6
1
5
10
8
10
0.63
8
16
6
16
0.4
13
26
4
25
0.25
20
40
2
35
0.16
31
62
60
8
10
0.63
7
14
6
16
0.4
10
20
4
25
0.25
17
34
2
35
0.16
26
52
The above lengths consider the resistance of the battery and cables only and do not take into account any
additional interconnects. The above lengths are for operation at 25°C/77°F. For high temperature installations
(40°C/104°F) increase wire gauge by 10%.
6.2. Grounding Instructions and Connection
6.2.1. Charger must be grounded to reduce risk of electric shock. The charger must be connected to a
grounded, metal, permanent wiring system, or an equipment-grounding conductor (earthing
conductor) must be run with the circuit conductors and connected to equipment-grounding
terminal on charger.
6.2.2. Connect the equipment grounding conductor to the ground lug in the charger (see Figures 1-3).
This lug is marked with the ground symbol. This should always be the first wire connected and the
last wire disconnected.
6.3. DC Connection
Ensure that any battery disconnect devices in the system, if used, are opened (batteries disconnected
from DC bus). Connect the DC output conductors to the DC output terminal block/breaker in the charger
(see Figures 1-3). Chargers with multiple outputs share a common negative connection (see Figure 4).
Always observe proper polarity of the DC output leads. Always connect the output leads in the following
order – charger output to ungrounded battery terminal, followed by charger output to grounded battery
terminal. If the battery must be disconnected for service, remove the output wiring in the reverse order.
Tighten connections to torque specified in Table 3. Route DC wiring at least ¼ inch (6 mm) away from AC
wiring, alarm wiring, and the circuit board.
WARNING:
A MAXIMUM OF 40 VOLTS MAY BE APPLIED AT THE OUTPUT
TERMINALS. HIGHER VOLTAGE MAY DAMAGE THE CHARGER.

SENS MicroGenius S2/S4 Technical Manual
16
Figure 4 – Multiple Output Connection
Table 3 – DC Allowed Wire Gauge and Torque Requirements
Charger
Model Connection Type
Allowed Wire Gauge Required Torque Tool
S2 Terminal Block 20-2 AWG (0.5-35 mm2)
≤#4: 22 In-Lb (2.5 Nm)
>#4: 40 In-Lb (4.5 Nm)
Phillips P2
S4 Breaker
<50A: 14-2 AWG (2.5-35 mm2)
≥50A: 12 AWG-2/0 (4-70 mm2)45 In-Lb (5.1 Nm) 5/16 inch flat-head
S4 Terminal Block 14 AWG-2/0 (2.5-70 mm2)
#6-2/0: 120 In-Lb (13.5 Nm)
#8: 40 In-Lb (4.5 Nm)
#14-#10: 35 In-Lb (4.0 Nm)
3/16 inch hex
Table 4 – DC Output Breaker Rating
Charger Rated
Output Current
(Amps)
Optional DC
Breaker Rating
(Amps)
15
20
20
25
25
40
30
40
35
45
45
60
50
70
60
90

SENS MicroGenius S2/S4 Technical Manual
17
6.4. AC Connection
This unit is permanently connected to the AC circuit and to the battery. For models not equipped with an
AC input breaker, an external disconnect device must be located in the AC input to the charger. The
charger is rated to operate on any AC input within the range of 90-265VAC, 47-63Hz.
Ensure that the AC input supply is de-energized. Connect the AC line and neutral conductors to the AC
input terminal block/breaker in the charger (see Figures 1-3). If there is an identified grounded circuit
conductor (neutral), attach it to the terminal marked “L2/N.” Tighten connections to torque specified in
Table 5. Route AC wiring at least ¼ inch (6 mm) away from DC wiring, alarm wiring, and the circuit board.
Table 5 – AC Allowed Wire Gauge and Torque Requirements
Charger Model
Connection Type
Allowed Wire Gauge
Required Torque
Tool
S2
Terminal Block
20-6 AWG (0.5-13.5 mm2)
10.5 In-Lb (1.2 Nm)
Phillips P2
S4
Breaker
14-2 AWG (2.5-35 mm2)
43 In-Lb (4.9 Nm)
5/16 inch flat-head
S4 Terminal Block 14-2 AWG (2.5-35 mm2)
#3-#2: 50 In-
Lb (5.6 Nm)
#6-4: 45 In-Lb (5.1 Nm)
#8: 40 In-Lb (4.5 Nm)
#14-#10: 35 In-Lb (4.0 Nm)
1/4 inch flat-head
Table 6 – AC Input Current and Breaker Rating
Charger Rated
Output Current
(Amps)
AC Input
Current
(Amps)
Optional AC
Breaker Rating
(Amps)
15
4
15
20
8
15
25
8
15
30
8
15
35
12
15
45
12
15
50
16
20
60
16
20
6.5. Alarm Connections
See charger inside cover label for original factory alarm relay assignments (see Figure 5). Alarm relay
assignments are custom configurable using the front panel keypad (based on application) or the SENS
Setup Utility. Connect alarm wiring to the respective terminals on the pluggable terminal block in the
charger (see Figures 1-3 for location in charger and Figure 6 for detail). To make wiring easier, the
terminal block unplugs from the header. Pull terminal block straight out from header to remove. Connect
wires to terminal block by tightening screws at each position. After wires are connected, plug terminal
block securely back into header. Wire from FAIL or OK to COM depending on whether the alarm should
be present on an open or closed circuit (see Tables 7-9). Connect alarm terminals only to low voltage,
limited energy (“Class 2”) circuits. Alarm circuits are rated 2A at 30V AC or DC. The terminals accept 28-
16 AWG (0.08-1.5 mm2) conductors. Tighten connections to 2.0 Lb-In (0.22 Nm) using a small slotted
driver. Route alarm wiring at least ¼ inch (6 mm) away from DC wiring, AC wiring, and the circuit board.
Relays will change state for an alarm on any output on chargers with multiple outputs.

SENS MicroGenius S2/S4 Technical Manual
18
Figure 5 – Configuration Label (on inside lower cover)
Figure 6 – Pluggable Terminal Block
(TB2 pins 1-9 shown)
Table 7 – Alarm Relay Contact Wiring for Genset Configuration
Wire from COM to OK for alarm present on open circuit or from COM to FAIL for present on closed circuit.
RELAY 1
RELAY 2
RELAY 3
RELAY 4
RELAY 5
Relay
Contacts
Summary
Alarm*
AC Fail + Charger
Fail Alarm
Low Crank Alarm
High DC Alarm
Low DC Alarm
Common
COM (TB1-1)
COM (TB1-4)
COM (TB2-1)
COM (TB2-4)
COM (TB2-7)
Open on
alarm
(normally
closed)
OK (TB1-2)
OK (TB1-5)
OK (TB2-2)
OK (TB2-5)
Defaults to OK
with no AC and
DC power
OK (TB2-8)
Close on
alarm
(normally
open)
FAIL (TB1-3)
Defaults to FAIL
with no AC input
FAIL (TB1-6)
Defaults to FAIL
with no AC input
FAIL (TB2-3)
Defaults to FAIL
with no AC and
DC power
FAIL (TB2-6)
FAIL (TB2-9)
Defaults to FAIL
with no AC and
DC power
*Summary alarm includes AC Fail, Charger Fail, Low Crank, High DC and Low DC alarms.
THREE POSITIONS
PER RELAY:
COM, OK, FAIL
PULL TO REMOVE
FROM HEADER
View output voltage,
battery type and
configuration code
set at the factory
View alarm relay
assignments set
at the factory

SENS MicroGenius S2/S4 Technical Manual
19
Table 8 – Alarm Relay Contact Wiring for Marine Configuration
Wire from COM to OK for alarm present on open circuit or from COM to FAIL for present on closed circuit.
RELAY 1
RELAY 2
RELAY 3
RELAY 4
RELAY 5
Relay
Contacts
Summary
Alarm*
AC Fail
Ground Fault
Alarm
High DC Alarm
Low DC Alarm
Common
COM (TB1-1)
COM (TB1-4)
COM (TB2-1)
COM (TB2-4)
COM (TB2-7)
Open on
alarm
(normally
closed)
OK (TB1-2)
OK (TB1-5)
OK (TB2-2)
Defaults to OK
with no AC and
DC power
OK (TB2-5)
Defaults to OK
with no AC and
DC power
OK (TB2-8)
Close on
alarm
(normally
open)
FAIL (TB1-3)
Defaults to FAIL
with no AC input
FAIL (TB1-6)
Defaults to FAIL
with no AC input
FAIL (TB2-3)
FAIL (TB2-6)
FAIL (TB2-9)
Defaults to FAIL
with no AC and
DC power
*Summary alarm includes AC Fail, Charger Fail, Ground Fault, High DC and Low DC alarms.
Table 9 – Alarm Relay Contact Wiring for Stationary Power Configuration
Wire from COM to OK for alarm present on open circuit or from COM to FAIL for present on closed circuit.
RELAY 1
RELAY 2
RELAY 3
RELAY 4
RELAY 5
Relay
Contacts
Summary
Alarm*
AC Fail
Battery
Discharging
Alarm
High DC Alarm
Low DC Alarm
Common
COM (TB1-1)
COM (TB1-4)
COM (TB2-1)
COM (TB2-4)
COM (TB2-7)
Open on
alarm
(normally
closed)
OK (TB1-2)
OK (TB1-5)
OK (TB2-2)
OK (TB2-5)
Defaults to OK
with no AC and
DC power
OK (TB2-8)
Close on
alarm
(normally
open)
FAIL (TB1-3)
Defaults to FAIL
with no AC input
FAIL (TB1-6)
Defaults to FAIL
with no AC input
FAIL (TB2-3)
Defaults to FAIL
with no AC and
DC power
FAIL (TB2-6)
FAIL (TB2-9)
Defaults to FAIL
with no AC and
DC power
*Summary alarm includes AC Fail, Charger Fail, Battery Discharging, High DC and Low DC alarms.
6.6. Remote Temperature Sensor Connection—Optional
The charger includes local temperature compensation using internal on-board sensors. Alternately, the
charger will use remote temperature compensation based on the temperature of the batteries when an
optional external sensor is located at the batteries and connected to the remote temperature sensor
terminal block in the charger (see Figures 1-3). Chargers with multiple output terminals also include
multiple remote temperature sensor terminal blocks (connect one sensor for each output). Remote
temperature compensation is highly recommended in all applications and is required for ultracapacitor
charging. It is most critical in applications where battery and charger are located in different ambient
conditions and in NFPA-20 fire pump and NFPA-110 emergency power system installations in order to
return 100% of the battery’s ampere-hour rating within 24 hours without causing damage to the battery.
The remote temperature sensor is not polarized; it does not matter which lead connects to each
terminal. Route sensor wiring at least ¼ inch (6 mm) away from DC wiring, AC wiring, and the circuit
board. Locate the remote sensor where it will accurately detect the battery temperature by connecting it
to a grounded battery terminal or the battery case. When securing to the battery case, use an

SENS MicroGenius S2/S4 Technical Manual
20
TWO PORTS:
Connect J1939 or Modbus
to one port
Pin 1
Pin 1
adhesive/glue properly rated for the application material and temperature, such as Super Glue®.
Temperature compensation is disabled by connecting a short across the remote temperature sensor
terminal block or by setting the temperature compensation slope to zero using the keypad or SENS Setup
Utility. See section 9.12for further information regarding temperature compensation. A 50-foot remote
temperature sensor is available to order separately (SENS p/n 209481).
6.7. SAE J1939 Communications Setup (CANbus)
Every charger includes SAE J1939 (CANbus) communications. The J1939 interface provides a highly
reliable, low cost method of delivering to the genset controller all information that NFPA 110 requires
the battery charger to deliver. To be operational, the genset controller must support the charger J1939
connection. Contact your genset supplier to determine if your genset supports a J1939-connected
charger. See section 10 for further information on J1939 operation and registers.
J1939 communications are disabled by default and until the BCH address is configured (see section
6.7.1). Connect J1939 communications using a twisted pair cable at the RJ-45 connector on the
alarm/communications circuit board located on the inside front cover (see Figures 1-3 for location in
charger and Figure 7 for detail). Two RJ-45 ports are provided. The ports are in parallel and either port
may be used. See Table 10 for connector pinout. Communications are non-isolated and referenced to
negative battery terminal. An adapter from RJ-45 to an 8-position terminal block may be connected to
the RJ-45 connector and is available to order separately (SENS p/n 208026).
Figure 7 – RJ-45 Connection
Table 10 – Connector Pinout
Pin #
Purpose
1
J1939 Data High/SENSbus
2
J1939 Data Low/SENSbus
3
No connect pass-through
4
Modbus –D0 (B)
5
Modbus +D1 (A)
6
No connect pass-through
7
Power*
8
Common (referenced to battery negative)
*Main circuit PCA only, used for interconnect between SENS devices
6.7.1. Battery Charger (BCH) J1939 Address
Configure the J1939 address using the front panel keypad (J9139 communications are disabled
until this address is configured). J1939 supports two chargers per network cable. Set to address 1
for main charger or address 2 for auxiliary charger. The charger is set to address 1 by default.
For multiple output chargers, J1939 address 1 (main charger) is assigned to charger output A and
address 2 (auxiliary charger) is assigned to output B by default. Use the keypad or the SENS Setup
Utility to configure J1939 addresses to any desired charger output.
6.7.2. Termination
For proper J1939 operation, a 120-ohm terminator is required at the ends of the J1939 bus. If
multiple devices are on the bus, only the devices on the ends of the network bus need