Smartgen HEM4000 User manual

HEM4000
ENGINE CONTROLLER
USER MANUAL

HEM4000 Engine Controller User Manual Page 2 of 46
Chinese trademark
English trademark
SmartGen —make your generator smart
SmartGen Technology Co., Ltd.
No. 28 Jinsuo Road
Zhengzhou
Henan Province
P. R. China
Tel: [phone]
[phone](overseas)
Fax: [phone]
Web: www.smartgen.com.cn/
www.smartgen.cn/
Email: [e-mail]
All rights reserved. No part of this publication may be reproduced in any material form (including
photocopying or storing in any medium by electronic means or other) without the written permission of
the copyright holder.
Applications for the copyright holder’s written permission to reproduce any part of this publication
should be addressed to SmartGen Technology at the address above.
Any reference to trademarked product names used within this publication is owned by their respective
companies.
SmartGen Technology reserves the right to change the contents of this document without prior notice.
Table 1 –Software Version
Date
Version
Note
2019-01-28
1.0
Original release
2021-01-11
1.1
Modify “generator” as “engine”; Optimize other translation
problems; Use the latest header and footer format.
2022-08-04
1.2
Update company logo and manual format.

HEM4000 Engine Controller User Manual Page 3 of 46
Table 2 –Notation Clarification
Sign
Instruction
NOTE
Highlights an essential element of a procedure to ensure correctness.
CAUTION!
Indicates a procedure or practice, which, if not strictly observed, could result in
damage or destruction of equipment.
WARNING!
Indicates error operation may cause death, serious injury and significant
property damage.

HEM4000 Engine Controller User Manual Page 4 of 46
CONTENTS
1 OVERVIEW...................................................................................................................................................6
2 PERFORMANCE AND CHARACTERISTICS ...............................................................................................6
3 SPECIFICATION ..........................................................................................................................................8
4 OPERATION.................................................................................................................................................9
4.1 KEY FUNCTIONS DESCRIPTION..........................................................................................................9
4.2 CONTROLLER PANEL ....................................................................................................................... 10
4.3 AUTO START/STOP OPERATION..................................................................................................... 10
4.3.1 AUTO START SEQUENCE........................................................................................................... 10
4.3.2 AUTO STOP SEQUENCE............................................................................................................. 11
4.4 MANUAL START/STOP OPERATION ............................................................................................... 11
4.4.1 MANUAL START SEQUENCE ..................................................................................................... 11
4.4.2 MANUAL STOP SEQUENCE ....................................................................................................... 11
4.5 START OPERATION OF FUEL PRE-SUPPLY OUTPUT...................................................................... 12
4.6 IDLE MODE......................................................................................................................................... 12
4.7 IDLE/HIGH SPEED MODE.................................................................................................................. 13
4.8 EMERGENCY START......................................................................................................................... 13
4.9 ENGINE SPEED ADJUSTMENT PROCESS ....................................................................................... 13
5 PUMP UNIT (WITH SUCTION PUMP) APPLICATION OPERATIONS .................................................... 14
5.1 D-DRIVEN PUMP START/STOP OPERATION................................................................................... 14
5.2 E-DRIVEN PUMP START/STOP OPERATION................................................................................... 15
6 PROTECTION ........................................................................................................................................... 16
6.1 WARNINGS ........................................................................................................................................ 16
6.2 SHUTDOWN ALARMS....................................................................................................................... 17
7 WIRING CONNECTION ............................................................................................................................ 19
8 SCOPES AND DEFINITIONS OF PROGRAMMABLE PARAMETERS...................................................... 21
8.1 SCOPES AND DEFINITIONS OF PARAMETERS ............................................................................... 21
8.2 DEFINED CONTENTS OF AUXILIARY OUTPUT PORTS 1-6 ............................................................. 29
8.2.1 DEFINED CONTENTS TABLE OF AUXILIARY OUTPUT PORTS 1-6......................................... 29
8.2.2 CUSTOM PERIOD OUTPUT ....................................................................................................... 32
8.2.3 CUSTOM COMBINED OUTPUT ................................................................................................. 33
8.3 DEFINED CONTENTS OF AUXILIARY INPUT PORTS ....................................................................... 34
8.4 SELECTION OF SENSORS ................................................................................................................. 36
8.5 CONDITION SELECTION OF CRANK DISCONNECTION .................................................................. 37
8.6 MAINTENANCE SETTING ................................................................................................................. 37
9 PARAMETER SETTING............................................................................................................................ 38
10 SENSOR SETTING.................................................................................................................................... 40
11 COMMISSIONING .................................................................................................................................... 41
12 TYPICAL APPLICATION .......................................................................................................................... 42
13 INSTALLATION ........................................................................................................................................ 44
13.1 FIXING CLIPS................................................................................................................................... 44
13.2 OVERALL DIMENSION AND CUTOUT ............................................................................................ 44

HEM4000 Engine Controller User Manual Page 5 of 46
14 FAULT FINDING ....................................................................................................................................... 45
15 PACKING LIST.......................................................................................................................................... 46

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1OVERVIEW
HEM4000 ENGINE CONTROLLER is used for controlling engine to realize engine auto start/stop,
data measuring, alarm protection and “three remotes” (remote control, remote measuring and remote
communication) functions. It provides speed regulation function, not only with relay speed-adjusting
output but also with GOV interface, which can control all kinds of non-EFI engines’ speed.
HEM4000 ENGINE CONTROLLER adopts large liquid crystal display (LCD) and selectable Chinese
and English interface with easy and reliable operation. Users can read engine working parameters from
the LCD directly.
HEM4000 ENGINE CONTROLLER uses 32 bits ARM micro-processor technology with the functions
of precise parameters measuring, fixed value adjustment, time setting and threshold adjusting etc. The
majority of parameters can be set on the front panel and all the parameters can be set and monitored
via USB port or RS485 port by using PC. With compact structure, simple connections and high reliability,
it can be widely used in a number of engine control systems, which include water pump system, beacon
system, air compressor, engineering machinery system and so on.
2PERFORMANCE AND CHARACTERISTICS
Key characteristics are as below,
─132x64 LCD with backlight, multilingual interface (including English and Chinese languages)
and easy operating interface;
─Hard acrylic screen protection with improved wear-resistance and scratch resistance;
─Silicon panel and pushbuttons for better operation in high and low temperature environment;
─RS485 communication port to realize remote controlling, remote measuring, remote
communication via ModBus protocol;
─6-way analog sensors, 3-way fixed resistor sensors, and 3-way flexible sensors, which can be
configured as resistor/current/ voltage type sensors;
─Multiple temperature, pressure and level sensor curves can be used and user-defined directly;
─Precisely collecting various engine parameters provides complete protection functions, such
as engine high water temperature/ low oil pressure, over speed and under speed protection;
─With mechanical speed regulation function and GOV speed adjustment function, it can control
engine speed up and down manually;
─Idle/high speed switchover function;
─All outputs are relay outputs;
─With the function of parameter setting, it allows users to change and set the parameters and

HEM4000 Engine Controller User Manual Page 7 of 46
at the same time they will be stored in the internal FLASH memorizer and cannot be lost in
case of power outage;
─Alternate crank disconnect conditions (engine speed, oil pressure);
─Engine speed can be obtained by speed sensor or W/L charging generator;
─Wide power supply range DC(8~35)V, which is suitable to different starting battery voltage
environment;
─Event log, real-time clock, scheduled start & stop functions (start one time once a
day/week/month);
─Heater, cooler and fuel pump control functions;
─Maintenance function. Actions (warning or shutdown) can be set when maintenance time due;
─All parameters adopt digital adjustment instead of conventional analog modulation with a
potentiometer, which improves the reliability and stability;
─Waterproof security level IP65 of the front panel due to the rubber seal in the case design;
─Metal fixing clips enable perfect performance in high temperature environment;
─Modular design, flame retardant ABS enclosure, pluggable connecting terminals and
embedded installation way; compact structure and easy installation.

HEM4000 Engine Controller User Manual Page 8 of 46
3SPECIFICATION
Table 3 –Technical Parameters
Items
Contents
Operating Voltage
DC8.0V to DC35.0V, Continuous Power Supply.
Power Consumption
<3W (standby ≤2W)
Speed Sensor Voltage
1.0V to 24.0V (RMS)
Speed Sensor Frequency
10,000 Hz (max.)
GOV Output Range
0V-10V
Charging Generator W/L
Voltage (1.0-24)V (RMS) Frequency (50-1000)Hz
Starting Relay Output
5A DC28V
Auxiliary Relay Output 1
5A DC28V
Auxiliary Relay Output 2-6
1A DC28V
Analog Sensor
3-way fixed resistor sensors (temperature, flexible sensor 1, flexible
sensor 2);
3-way sensors can be configured as resistor/current/voltage type
sensors (oil pressure, flexible sensor 3, flexible sensor 4)
Case Dimension
135mm x 110mm x 44mm
Panel Cutout
116mm x 90mm
Working Temperature
(-25~+70)°C
Working Humidity
(20~93)%RH
Storage Temperature
(-25~+70)°C
Protection Level
IP65 Front panel
Weight
0.35kg

HEM4000 Engine Controller User Manual Page 9 of 46
4OPERATION
4.1 KEY FUNCTIONS DESCRIPTION
Table 4 –Keys Description
Icons
Keys
Description
Stop/Reset
1. Stop running engine in Auto/Manual mode;
2. Reset alarms in stop mode;
3. Pressing over 3 seconds can know whether the panel lamp is OK
(Lamp test);
4. Press this again in stop process can stop the engine
immediately.
Auto
Press this key and controller goes to Auto mode.
Manual
Press this key and controller goes to Manual mode.
Speed
If speed adjusting enabled, press this key to enter adjusting speed
page to raise/drop engine speed.
Start
Start engine in Manual mode.
Up/Increase
1. Screen scroll;
2. Moving cursor up and increase value in setting menu.
Down/Decrease
1. Screen scroll;
2. Moving cursor down and decrease value in setting menu.
Set/Confirm
1. Entering into parameter setting page after pressing this key in
main screen;
2. Confirm information in setting page.

HEM4000 Engine Controller User Manual Page 10 of 46
4.2 CONTROLLER PANEL
Fig.1 –Front Panel Drawing
NOTE: Parts of indicators description:
Warning indicator: Waning alarms occur: slowly flash; shutdown alarms occur: fast flash; no alarms occur: extinguished;
Status indicator: It is illuminated when engine is normal; flashing when engine is in stop delay;
Auto mode indicator: It is illuminated in auto mode; flashing in start delay.
4.3 AUTO START/STOP OPERATION
4.3.1 AUTO START SEQUENCE
a) Press , the indicator beside it illuminates, which means the engine is in auto start mode;
b) When “remote start” input is active, “start delay” is initiated, and auto mode indicator flashes at the
same time;
c) After start delay, auto mode indicator changed from flashing to illuminating, and preheating relay
outputs (if configured), “preheating delay XX”will be displayed on the LCD;
d) After the preheating delay, the fuel relay outputs pre-start fuel time (1 second default) and then the
starting relay outputs. If it fails to fire in the crank time, the fuel relay and starting relay stop outputs
and enter “crank rest time”, waiting for another crank;
e) During the set crank times, if the engine fails to fire, the controller will output crank failure and stop
and meanwhile the alarm page shows crank failure alarm;
f) If it starts successfully in the crank attempts, it goes to “safe operation time”, during which low oil

HEM4000 Engine Controller User Manual Page 11 of 46
pressure, high water temperature, under speed and charging failure alarms are all disabled. As soon
as the safe operation delay is over, “start idle delay”is initiated (if configured);
g) During the “start idle delay”, under speed alarm is disabled. When this delay is over, “high-speed
warming up delay”is initiated (if configured);
h) After the “warming up delay” has expired, the engine goes to normal operation status. If the speed is
abnormal, the controller will alarm and stop (alarms will be displayed on the LCD).
4.3.2 AUTO STOP SEQUENCE
a) When the “remote start” signal is not available, and the “remote stop” signal is effective, the stop delay
is initiated, and the status indicator flashes;
b) Once the “stop delay” ends, “high-speed cooling delay” is then initiated. During the cooling delay, if the
“remote start”signal is active again, the controller will re-enter running status. If cooling delay ends,
“stop idle delay”is initiated;
c) During the stop idle delay (if configured), idle relay outputs with power;
d) The ETS delay goes on next, ETS relay is energized and fuel relay is de-energized;
e) Stop delay begins, and complete stop is detected automatically;
f) When the engine stops completely, after-stop delay will be initiated. Otherwise, the controller fails to
stop and meanwhile the alarm of stop failure is initiated. (If the engine stops successfully after “stop
failure” alarm, after-stop delay will be initiated and the alarm will be removed automatically);
g) After the after-stop delay, the engine will be in standby mode.
4.4 MANUAL START/STOP OPERATION
4.4.1 MANUAL START SEQUENCE
a) Press and Manual mode is on. Indicator right by is light;
b) Press and the engine starts; Successful start can be detected automatically and the engine
accelerates to high-speed running automatically;
c) The controller can protect the engine to stop quickly if high water temperature, low oil pressure and
over speed appear during the running process. (please refer to automatic start sequence 4.3.1,
c)~h)).
4.4.2 MANUAL STOP SEQUENCE
Press and the running engine stops. (please refer to automatic stop sequence 4.3.2, b)~g)).

HEM4000 Engine Controller User Manual Page 12 of 46
4.5 START OPERATION OF FUEL PRE-SUPPLY OUTPUT
When output is set as “Fuel Pre-supply Output”, and auto/manual mode starting is active:
If the fuel pre-supply set time is under or equal to pre-heating time, LCD will display “preheating
delay XX”, and both preheating relay (if configured) and fuel pre-supply relay (fuel pre-supply set time)
output; After the preheating delay, fuel relay outputs the pre-star fuel time (default: 1 second), then the
starting relay outputs; The remaining start process is the same as automatic start procedure (please
refer to automatic start sequence 4.3.1, d)~h)).
If the fuel pre-supply set time is more than the preheating time, preheating delay starts and fuel
pre-supply relay outputs. When the preheating delay ends, the remaining fuel pre-supply time starts and
it enters fuel pre-supply phase. LCD will display “fuel pre-supply time XX” and fuel pre-supply relay is
energized; when the fuel pre-supply delay is expired, fuel relay outputs the set pre-start fuel time
(default: 1 second) and afterwards starting relay outputs; The remaining start process is the same as
automatic start procedure (please refer to automatic start sequence 4.3.1, d)~h)).
When the output port is set “fuel pre-supply output” and the engine is in the standby status, the set
“fuel pre-supply rest time” and “fuel pre-supply time” output circularly; If the “fuel pre-supply rest time” is
0, the fuel pre-supply does not work.
4.6 IDLE MODE
Input setting 8: Idle Mode:
If engine is in good running status and the idle mode input is active, the idle mode starts and the
engine enters idle running. At this time the idle relay is energized and the speed-reducing relay starts.
If engine is in the standby status and the idle mode input is active, the auto/manual mode starts
regularly; “safe running delay” ends, and the engine enters “start idle delay”(if configured); When the
start idle delay ends, the engine enters idle running. Idle controlling relay outputs and the
speed-reducing relay outputs.
In the idle mode, engine is in the idle running process; idle mode input is invalid, it will exit from the
idle mode. The engine enters normal operation, the idle controlling relay stops outputting and the
speed-reducing relay stops outputting.
In the idle mode, engine is in the idle running process; press and make the engine stop. The
engine goes from “idle running” to “stop idle delay”,(if configured), and the remaining stop process is
the same as automatic stop procedure (please refer to the automatic stop sequence 4.3.2,c)~g)).
If the configured speed adjustment type is relay or GOV, the speed can be adjusted in the normal
running phase.

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4.7 IDLE/HIGH SPEED MODE
Input setting 14: Idle/High Speed:
If engine is in good running status and the idle/high speed mode input is active, the engine enters
idle running status. The idle controlling relay outputs and the speed-reducing relay outputs. If the
configured speed adjustment type is relay or GOV, press the speed-increasing key, and the idle relay
stops outputting and the speed-reducing relay is the same. The speed can be adjusted in the idle
running phase.
If the engine is in the standby status and the idle/high speed input is active, the auto or manual
mode can work normally. After the “safe running delay”, engine goes to “start idle delay” (if configured).
After start idle delay, it enters idle running, the idle controlling relay outputs and the speed-reducing
relay outputs. If the configured speed adjustment type is relay or GOV, press the speed-increasing key,
and the idle controlling relay and the speed-reducing relay both stop outputting. The speed can be
adjusted in the idle running phase.
When the engine is running in the idle mode, the idle/high speed input is invalid. It will exit from the
idle operation and go to high speed warming-up phase; at this time speed-increasing relay outputs.
When the “high speed warming-up delay” ends, the speed-increasing stops outputting, the engine goes
to normal running. After speed adjustment type collocation, speed can be adjusted in normal running
status.
In the process of the idle running, press and make the engine stop. The engine goes from
“idle running” to “stop idle delay” (if configured), and the remaining stop process is the same as the
automatic stop procedure (please refer to the automatic stop sequence 4.3.2, c)~g)).
4.8 EMERGENCY START
NOTE: Pressing and simultaneously can force the engine to start. At this moment, controller does not
judge whether the engine starts successfully is not based on the crank disconnect conditions. The starter disconnection is
controlled by the operator. When the operator observes that the engine has started successfully, he/she can release the key,
then the starting stops outputting and the controller enters safe running delay.
4.9 ENGINE SPEED ADJUSTMENT PROCESS
Configuration of speed regulation input type: 1: Relay Speed Adjustment
If the relay speed adjustment is set, relay output ports need to be configured as “Raise Speed
Output” and “Drop Speed Output”.
Configuration of speed regulation input type: 2: GOV Speed Adjustment
Set the corresponding GOV voltage output center and voltage output range according to the type of

HEM4000 Engine Controller User Manual Page 14 of 46
electronic speed controller, and then set the stepping coefficient of GOV speed adjustment.
Press and the speed adjustment screen shall be as below. When the engine is in normal
running, the speed can be adjusted. At this moment, press to raise the speed and press to
reduce the speed. Press again to exit and stop speed adjustment.
Fig.2 –Speed Adjustment Screen
NOTE: Speed can be adjusted up to 110% of rated speed.
5PUMP UNIT (WITH SUCTION PUMP) APPLICATION OPERATIONS
5.1 D-DRIVEN PUMP START/STOP OPERATION
Set input port function: D-driven pump started, suction pump pressure coming;
Set output port function: D-driven pump starts outputting, D-driven suction pump stops outputting.
Suction pump type: D-driven.
—D-driven Pump Start:
After auto/manual start mode is active, preheating relay outputs (if configured) and LCD
screen displays “preheating delay XX”. After the preheating delay, D-driven suction pump’s starting
relay outputs (output is to be configured). If the successful starting input (input is to be configured)
is invalid during the “D-driven suction pump’s starting time”, the pump starting relay stops
outputting and enters “pump starting interval”, waiting for next starting; during the set starting
times, if the pump fails to start, the controller will output starting failure alarm and stop, and the
alarm screen displays “pump starting failure alarm shutdown.”;
At any one time of starting, if D-driven pump succeeds, it will enter “waiting for pressure
coming” delay. When the delay is overtime, pressure coming output (input is to be configured) is
invalid and the controller conducts pump fault alarm and stops the pump; Meanwhile, the screen
displays “pump fault alarm shutdown”;
For the time of waiting for pressure coming, if the pressure coming input is active (input is to
be configured), the fuel relay outputs the set pre-start fuel time (default: 1 second). Afterwards the
starting relay outputs. The remaining start process is the same as the automatic start procedure
(for the details please refer to 4.3.1, d)~h));
—D-driven pump stop: after “safe running delay”, D-driven pump stops outputting (output is to be
configured), and it stops to output after the setting time (ETS time).
Engine Speed
Raise
1500RPM Drop
Normal Running

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5.2 E-DRIVEN PUMP START/STOP OPERATION
Set Input port function: suction pump pressure coming.
Set Output port function: E-driven pump starting outputs.
Suction pump type: E-driven suction pump.
—E-driven pump start: After suction pump type is set to be E-driven pump and safe running delay
is over, the starting relay outputs (output is to be configured).
—E-driven pump stop:
When the engine is between start idle time and high-speed cooling time, if the input is pump
pressure coming (input is to be configured) or the outlet pressure is larger than the value of stop
pressure of E-driven suction pump, the starting relay stops to output.
If the engine is in ETS delay, the starting relay stops to output.
NOTE: The outlet pressure of E-driven pump needs outlet pressure associated setup to relate to corresponding
auxiliary sensors.

HEM4000 Engine Controller User Manual Page 16 of 46
6PROTECTION
6.1 WARNINGS
When the controller detects warning signals, it only outputs warnings without shutdown. If
warnings are cleared, they will disappear automatically.
Table 5 –Warning Alarms
No.
Type
Description
1
Over Speed
When the controller detects that the engine speed has
exceeded the pre-set value, it will initiate a warning alarm.
2
Under Speed
When the controller detects that the engine speed has fallen
below the pre-set value, it will initiate a warning alarm.
3
Loss of Speed Signal
When the controller detects that the engine speed is 0 and the
selected action for speed loss is “Warning”, it will initiate a
warning alarm.
4
Stop Failure
When “after stop” delay is over, if engine does not stop
completely, it will initiate a warning alarm.
5
Charging Failure
When the controller detects that charger voltage is less than
the pre-set value, it will initiate a warning alarm.
6
Battery Over Voltage
When the controller detects that engine battery voltage has
exceeded the pre-set value, it will initiate a warning alarm.
7
Battery Under Voltage
When the controller detects that engine battery voltage has
fallen below the pre-set value, it will initiate a warning alarm.
8
Engine Temp. Sensor Open
Circuit
When the controller detects that the temperature sensor is
open circuit and the selected action is “Warning”, it will initiate
a warning alarm.
9
Engine High Temperature
When the controller detects that engine temperature has
exceeded the pre-set value, it will initiate a warning alarm.
10
Engine Low Temperature
When the controller detects that engine temperature has fallen
below the pre-set value, it will initiate a warning alarm.
11
Engine OP Sensor Open
Circuit
When the controller detects that the oil pressure sensor is open
circuit and the selected action is “Warning”, it will initiate a
warning alarm.
12
Engine Low Oil Pressure
When the controller detects that the oil pressure has fallen
below the pre-set value, it will initiate a warning alarm.
13
Auxiliary Sensor 1~4 Open
Circuit
When the controller detects that the sensor 1～4 is open circuit
and the selected action is “Warning”, it will initiate a warning
alarm.
14
Auxiliary Sensor 1~4 High
When the controller detects that the sensor 1～4 value has
exceeded the pre-set upper limit value, it will initiate a warning
alarm.
15
Auxiliary Sensor 1~4 Low
When the controller detects that the sensor 1～4 value has
fallen below the pre-set lower limit value, it will initiate a

HEM4000 Engine Controller User Manual Page 17 of 46
No.
Type
Description
warning alarm.
16
Over Flow Warning
When the controller detects that the flow value has exceeded
the pre-set upper limit value, it will initiate a warning alarm.
17
Input Port 1~5 Warning
When digital input is configured as “Warning”, and input port is
active, controller will initiate a warning alarm.
18
Maintenance 1~5 Warning
When the countdown time is 0 and the selected action is
“Warning”, it will initiate a warning alarm.
19
Authorized Time Due
When the controller reaches authorized time, and selected
action is “Warning”, it will initiate a warning alarm.
20
Battery Under Voltage
Under scheduled start, before starting, when controller detects
battery voltage is lower than the pre-set value, it will initiate a
warning alarm. This warning cannot disappear automatically,
and it needs to press “Stop” key in stop mode to remove.
6.2 SHUTDOWN ALARMS
When controller detects shutdown alarm, the screen displays shutdown contents and it will shut down
immediately. When the engine stops completely, users need to press alarm reset key to reset shutdown
alarms.
Table 6 –Shutdown Alarms
No.
Type
Description
1
Emergency Stop
When the controller detects emergency stop alarm signals, it
will initiate a shutdown alarm.
2
Over Speed
When the controller detects that the engine speed has
exceeded the pre-set value, it will initiate a shutdown alarm.
3
Under Speed
When the controller detects that the engine speed has fallen
below the pre-set value, it will initiate a shutdown alarm.
4
Loss of Speed Signal
When the controller detects that the engine speed is 0 and the
selected action is “Shutdown”, it will initiate a shutdown alarm.
5
Start Failure
If engine fails to start within preset attempts, it will initiate a
shutdown alarm.
6
High Temperature Input
Shutdown
When the input port of controller is set as “High Temp.
Shutdown” and it is valid, controller will initiate a shutdown
alarm.
7
Low Oil Pressure Input
Shutdown
When the input port of controller is set as “Low Oil Pressure
Shutdown” and is active, controller will initiate a shutdown
alarm.
8
Engine Temp. Sensor Open
Circuit Shutdown
When the controller detects that the temperature sensor is
open circuit and selected action is “Shutdown”, it will initiate a
shutdown alarm.
9
Engine High Temp.
When the controller detects that temperature has exceeded the
pre-set value, it will initiate a shutdown alarm.
10
Engine OP Sensor Open
When the controller detects that the sensor is open circuit and

HEM4000 Engine Controller User Manual Page 18 of 46
No.
Type
Description
Circuit
selected action is “Shutdown”, it will initiate a shutdown alarm.
11
Engine Low Oil Pressure
When the controller detects that engine oil pressure has fallen
below the pre-set value, it will initiate a shutdown alarm.
12
Auxiliary Sensor 1~4 Open
Circuit
When the controller detects that sensor 1～4 is open circuit
and the selected action is “Shutdown”, it will initiate a shutdown
alarm.
13
Auxiliary Sensor 1~4 High
When the controller detects that sensor 1 ～4 value has
exceeded the pre-set upper limit value, it will initiate a
shutdown alarm.
14
Auxiliary Sensor 1~4 Low
When the controller detects that sensor 1～4 value has fallen
below the pre-set lower limit value, it will initiate a shutdown
alarm.
15
Suction Pump Crank
Failure
If diesel driven pump fails to start within preset attempts,
controller will initiate a shutdown alarm.
16
Suction Pump Fault
When the controller is in the phase of breakdown stop delay
and the input pressure coming signal is invalid, controller will
initiate a shutdown alarm.
17
Input Port 1~5 Shutdown
When digital input is configured as shutdown and is active,
controller will initiate a corresponding shutdown alarm.
18
Over Flow Shutdown
When the controller detects that the flow value has exceeded
the pre-set upper limit value, it will initiate a shutdown alarm.
19
Maintenance 1~5 Due
When countdown time is 0 and the selected action for
maintenance due is shutdown, it will initiate a shutdown alarm.
20
Authorized Time Due
When controller reaches authorized time, and the selected
action is shutdown, it will initiate a shutdown alarm.

HEM4000 Engine Controller User Manual Page 19 of 46
7WIRING CONNECTION
Fig.3 –Controller Rear Panel
Table 7 –Terminal Connection Description
No.
Function
Cable Size
Remarks
1
B-
1.5mm2
Connected with negative terminal of starting battery.
2
B+
1.5mm2
Connected with positive terminal of starting battery.
3
COM1 Relay
Common Port
1.5mm2
Connected with COM1 output, rated 5A DC28V.
4
Crank Relay Output
1.5mm2
5
Aux. Relay Output 1
1.5mm2
6
COM2 Relay
Common Port
1.0mm2
Connected with COM2 output, rated
1A DC28V.
For settings
refer to Table 9.
7
Aux. Relay Output 2
1.0mm2
8
Aux. Relay Output 3
1.0mm2
9
Aux. Relay Output 4
1.0mm2
10
Aux. Relay Output 5
1.0mm2
Relay’s normally open passive contact,
rated 1A DC28V.
11
1.0mm2
12
Aux. Relay Output 6
1.0mm2
Normally open, rated 1A DC28V
13
1.0mm2
Normally close, rated 1A DC28V
14
1.0mm2
Relay common port
15
B(+)
0.5mm2
GOV speed adjustment output
16
A(-)
0.5mm2
17
RS485 A(+)
0.5mm2

HEM4000 Engine Controller User Manual Page 20 of 46
No.
Function
Cable Size
Remarks
18
RS485 B(-)
0.5mm2
19
Emergency
Shutdown Input
0.5mm2
Once it is valid, controller stops engine immediately.
20
Aux. Input 1
0.5mm2
Ground connected is active (B-).
For settings
refer to Table
10.
21
Aux. Input 2
0.5mm2
Ground connected is active (B-).
22
Aux. Input 3
0.5mm2
Ground connected is active (B-).
23
Aux. Input 4
0.5mm2
Ground connected is active (B-).
24
Aux. Input 5
0.5mm2
Ground connected is active (B-).
25
Charger (D+) Input
1.0mm2
Connected with D + (W/L) of charger. If it does not exist,
please hang it in the air.
26
Aux. Input Common
Port
0.5mm2
Has been connected to (B-) Internally.
27
W/L
0.5mm2
Connected with W terminal of charging generator.
28
MP2 Speed Sensor
Input, controller
internally has
connected to B(-)
0.5mm2
Connected with engine speed sensor. Shielding wire is
recommended.
29
MP1 Speed Sensor
Input
0.5mm2
30
Temperature Sensor
1.0mm2
Connected with temperature sensor
(resistor type).
For settings
refer to Table
11.
31
Oil Pressure Sensor
1.0mm2
Connected with pressure sensor
(resistor/current/voltage type).
32
Aux. Sensor 1
1.0mm2
User-defined (resistor type)
33
Aux. Sensor 2
1.0mm2
User-defined (resistor type)
34
Aux. Sensor 3
1.0mm2
User-defined (resistor/current/voltage
type)
35
Aux. Sensor 4
1.0mm2
User-defined (resistor/current/voltage
type)
36
DC5V
1.0mm2
Provide power for voltage type sensor
37
Sensor COM (B-)
1.0mm2
Sensor common port. Controller inside has connected
with B-.
USB
/
Communicating with PC monitoring software.