Homa HSK15 User manual

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HOMA Pump Technology - 0-
Operating manual
HOMA
Pump control
HSK15 / 25
Please follow safety guidelines in chapter 2
Version: 03 - 0.06_300704
SW-Version: 1.10c
HW-Version: 1.00
Date: 21.10.2004
Библиотека СОК 

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Table Of Contents
1 Introduction 3
2 Safety guidelines 3
2.1 Marking of guidelines in the operating manual 3
2.2 To be observed 3
2.3 Application in the Ex – endangered areas 4
3 Load section 5
3.1 Main switch 5
3.2 Motor protection 6
3.3 RCD's (ELCB) 6
4 Function 6
4.1 Level measurement method 6
4.2 Pump control 6
4.2.1 Off – Automatic – On mode 6
4.2.2 Current measurement and ampere meter function 7
4.2.3 Thermo contacts 7
4.2.4 Run time monitoring 7
4.2.5 Special characteristics when operating two pumps 7
4.3 Fault messages and alarms 7
4.4 Operation and Displays 8
4.5 Rechargeable battery operation 9
5 Operation and Displays 9
5.1 Main menu 9
5.2 Main display 10
5.3 Pump operation mode 11
5.3.1 Change of pump operation mode using menus 11
5.3.2 Change of operation mode - additional keys 12
5.3.3 Change of operation mode by means of external switches 12
5.4 System menus and settings 12
5.5 Messages after starting the system 13
6 System menus 14
6.1 Level measurement 14
6.1.1 Level measurement setting 14
6.1.2 Zero adjustment 15
6.1.3 Filter 15
6.1.4 Minimum pressure 16
6.1.5 Cut-in, cut-out and alarm levels 16
6.2 Pump data 17
6.2.1 Run-on time 17
6.2.3 Pump rotation when using dual pump control 17
6.2.4 Time delay start when using dual pump operation 18
6.2.5 Rated pump current 18
6.3 Communication 18
6.4 Alarms 18
6.4.1 Alarm Auto Reset 21
6.4.2 Resetting alarms 22
6.4.3 Alarm relays 1 - 3 22
6.4.4 Mask Relays 1 - 3 22
6.4.5 Alarm buzzer 23
6.4.6 Allowed T1 alarms 23
6.4.7 High water alarm delay 23

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6.5 General settings 23
6.5.1 Language selection 24
6.5.2 Changing password 24
6.5.3 Number of pumps 24
6.5.4 Time delay start 24
6.5.5 Short time start 25
6.5.6 Forced emptying 25
6.5.7 Date, time and SW-Version 25
6.6 System indications 26
6.6.1 Pump hour indication 26
6.6.2 Pump cycle counter 26
6.6.3 Deleting of hour meter / and cycle counter data 26
6.6.4 Supply and rechargeable battery voltage 26
6.6.5 Fault history indication 26
7 Switching behavior 27
8 Special functions 28
8.1 AUX inputs 28
8.2 External Off 28
8.3 External alarm 29
9 Fault messages 29
10 Standard settings 31
11 Setting and wiring guidelines 31
11.1 Pumps without a second thermo contact 31
11.2 Pumps with PTC 32
11.3 Operation with rechargeable batteries 32
11.4 Level sensor and float switch connection 33
11.5 Level measurement according to the impact pressure method 35
11.6 Voltage surge protection 35
12 Appendix 35
12.1 Example for fault codes in fault memory 35
12.2 General technical data 36
12.3 Wiring and connecting diagrams 37
12.4 Mounting 38
In case of questions and technical problems please contact:
HOMA Pumpenfabrik GmbH
Industriestrasse 1
D-53819 Neunkirchen - Seelscheid
phone +49 - 2247 702 - 0
telefax +49 - 2247 702 - 339
http://www.homa-pumpen.de
Stand July 2003 - Technical changes reserved

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1 Introduction
HOMA HSK is a modular pump control for up to two pumps, which has specifically been designed for
use in the wastewater sector. The pump control measures and monitors the level of the medium and
depending on the level, starts or stops either one or two pumps. In addition, the HSK continually
monitors the built manual motor starters and the pump motor thermo contacts as well as phase
sequence and phase drop. Other features include, integrated current measurement, hour meter and
cycle counter as well as a flexible alarm messaging system.
The HSK pump controller is available in various configurations. This manual describes the control
functions in detail.
Please note! All of the functions described in this manual may not be available on every pump control
as this will depend on the configuration selected. The HSK15 control unit in particular, does not have
all of the functions and features of the HSK25 pump control.
2 Safety guidelines
This operating manual exclusively describes the control unit section. It contains important references
and warnings, and therefore should be read by the installer as well as by the relevant operator before
installing and operating the unit.
Note! Not only should the general safety references mentioned in this “Safety guidelines” section be
observed, but also any special safety references referred to in the other sections of the manual.
2.1 Marking of guidelines in the operating manual
Safety references contained in this operating manual, which can cause personal danger on failure to
observe them, are
2.2 To be observed
The description and instructions in this operating manual relate to the HSK controls.
This operating manual does not take into account either all possible design details, styles or all
possible coincidences and incidents, which may occur during mounting, operation and maintenance.
The CPS modular pump control is to be used by professionally trained personnel (see EN 50 110-1).
Warning against electric voltage is marked with this general danger symbol.
marked with this general danger symbol.

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In such case that not all of the information and instructions are found in this operating manual, please
ask the manufacturer, HOMA-Pumpenfabrik GmbH (address see page 2).
The manufacturer of this device takes no responsibility in case the operating manual is disregarded.
This operating manual contains fundamental references which must be strictly observed during
installation, operation and maintenance. Therefore, it is absolutely necessary that this operating
manual be read before mounting and operation by the installer as well as by the appropriate qualified
personnel / user and it has to be available at all times.
Not only the general safety guidelines mentioned in this main point “Safety Guidelines” section be
observed, but also special safety references referred to in other sections of the manual.
Before operating make sure that:
•the applied measuring method has been correctly selected in the control,
•the level sensor / float switch to be used are correctly connected,
•the thermo contacts of the pump are appropriately connected and not reversed,
•the current ranges and settings of the motor starter match the rated currents of the pumps,
•the connections have been executed properly and correctly,
•the control is correctly backed up.
Currently valid standards (EN, VDE, …) as well as those of the local electrical board are to be
observed. The OFF position of the internal switches is not be used in order to carry out maintenance
of the pump(s). For this purpose, the main switch shall be used. The integrated manual motor starter
can also be used (switch to 0-position and secure properly against renewed switching – for example
by means of a padlock).
If the fuse of the control1is faulty, it should only be replaced by a fine fuse of the following types:
Si 3,15 AT (slow-blow 3,15A; 5 x 20 mm according to EN 60127-2/III)
2.3 Application in the Ex – endangered areas
In some cases, parts of the control device may be exposed to explosion endangered areas ( as a rule
zone 1 according to the EU –Directive 94/9/EG, ATEX 100a).
If the control device is operated on such a shaft, well etc., then the electrical circuits for the sensors
(level sensor, float switches) must be intrinsically safe (e.g. by using an appropriate electrical (Zener)
barrier). Only controls with appropriate ignition protection characteristics should be connected. The
currently applicable standards concerning operating devices in explosion endangered areas shall be
observed at all times.
The use of an open measuring system according to the impact pressure method in explosion
endangered installations is permitted only with monitored aeration (bubbler system).
1The fuse of the control is located in the fuse holder on the lower left , next to clamps.
Connecting and maintenance of the control may
be carried out by qualified personnel only.
Before opening the cover, make sure that the
voltage is completely removed.

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When the controller already features factory-installed isolating amplifiers and/or electrical (zener)
barriers, then the permission documents and operating instructions are included with the switchgear
and they must be adhered to. Particular attention to applicable regulations concerning wiring is to be
paid! It is expressly pointed out that the it is the user‘s responsibility:
2.4 Additional documents
In addition to this operating manual and depending on the layout of the switchgear, further documents
and manuals may be attached to this operating manual and they are to be observed:
•Clamp and wiring diagrams
•Documents for Ex-certified assembly units
•CPS documentation with telemetry functions (SCADA-Supervisory Control And Data Acquisition).
3 Load section
The load section of the control depends on the layout and the pump capacity. For this purpose
reference is made to wiring and connection diagrams. In connection with the control, however, the
following shall be observed:
3.1 Main switch
When the control is equipped with a main switch, then the control is switched on or off by means of the
main switch. The enclosure cover can only be opened when the main switch is in the OFF position.
The main switch has an emergency off function and it stops the pump(s). The master switch can be
locked in the OFF position by means of a padlock.
Remark: If the control unit comes already equipped with a rechargeable battery, then the electronic
system of the control continues to function as long as the battery is charged, even in case the main
switch is turned off, however, the pumps can not be switched on. For further details see operation with
rechargeable batteries.
•to guarantee observance of the applicable regulations
•to carry out the installation in accordance with ATEX100a requirements
•to execute required inspections and documentation.
•to connect only appropriate and certified assembly units (like pumps, level sensors).
Attention:The in-coming clamps of the
main switch are live, even when the main
switch is in the off position
Attention:If the control unit should not be equipped with a
main switch, then this control unit shall be made voltage free
before opening of the cover!

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3.2 Motor protection
Depending on the layout of the control, each pump features a thermal overload relay or
a manual motor starter. Setting of the current values is carried out directly on the thermal overload
relay or on the manual motor starter and shall be in accordance with the pump data. The setting must
be carried independently of the rated current settings of the electronic motor protection of the control
unit. When the motor protection trips due to an overload, the fault is indicated in the display. After
eliminating the problem, the manual motor starter or overload relay must be reset manually.
3.3 RCD's (ELCB)
The control unit may be equipped with one or two RCD's. When the RCD's trip, the pumps are
switched off. Should the RCD's trip due to a fault current, it is displayed in the control. After eliminating
the problem, the RCD(s) must be reset manually.
4 Function
4.1 Level measurement method
The control may be used for different level measurement methods:
1. External level sensor
•measuring range from 0 ... 1m WC up to 0 ... 10m WC (adjustable);
•4… 20mA interface
•additionally a float switch PSN as high water level monitor
2. Internal impact pressure measuring sensor
•measuring range 0 … 2 m WC
•for connection to a wet bell using a pneumatic tube
•additionally a float switch PSN as high water level monitor
3. Up to 4 float switches PSN
4.2 Pump control
The control can operate optionally with one or two pumps2. Generally, the following can be said about
the function: When an adjustable level is exceeded or the respective float switch switches, then the
pump is switched on. When a level sinks under an adjustable value, then the pump is switched off
after the set run-on time period (delay on break) elapses. When the control recognises a high water
situation, then the pump remains switched on as long as this state is maintained. Simultaneously a
fault message is given.
4.2.1 Off – Automatic – On mode
Apart from the above described automatic operation mode, each pump may be manually switched off
or on by means of the operating keys or an external toggle switch. For details see Chapter 5.3
2Depending on the features, the operation with only one pump is possible as well.

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4.2.2 Current measurement and ampere meter function
The control unit measures the current for each pump in a motor phase. The current is indicated in the
display. Additionally, the current is monitored and thus an electronic motor overload relay is simulated.
Undercurrent monitoring is also carried out.
4.2.3 Thermo contacts
As a general rule, waste water pumps feature one or two thermo contacts (Klixon) which trip at
different temperatures. If the first thermal contact trips, a fault situation is given and the pump is
stopped. In case the first thermo contact with the lowest temperature value trips, the pump will restart
up to ten times after the thermo contact has cooled down. The allowable number of restarts is
programmable. When the second thermal contact trips, this alarm is retained zero-voltage safe and it
must be reset (if required) before the pump is released again. (see Chapter 5.4).
4.2.4 Run time monitoring
Additionally, the control monitors the run time of the pump(s). If the max. adjusted run time of a pump
is exceeded, then an alarm is given. If 0 is set as max. run time value, then this function is
deactivated.
Note: Run time monitoring also takes place in case of high water.
4.2.5 Special characteristics when operating two pumps
When operating two pumps, two different operation modes are to be distinguished:
•Alternating (or rotation) operation (1 / 1)
•Peak load operation (2)
When operating the control with two pumps, the pumps will operate on a rotation basis, that is, the
pumps start alternatively so that, on an average, the load is evenly spread over the two pumps. In
case of peak load operation the second pump has an additional on and off switching level. If the
second cut-in level is exceeded or in case of high water, the second pump will additionally run as a
peak load pump. To avoid a possible overloading of the mains supply, the second pump performs a
delayed start according to the set delay time. In case of alternating operation, both pumps generally
will not run at the same time. If a pump has caused a fault or if it has manually been switched off, the
control unit will continue to work as a single pump control until the problem has been solved.
4.3 Fault messages and alarms
In addition to the above described fault messages assigned to the pumps, the control unit monitors
whether the following faults have occurred:
•High water
•Phase drop or phase sequence
•faults in measuring technique (short circuit or wire breakage in the level sensor cable, inconsistent
float switch status

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•loss of control voltage
•rechargeable battery voltage too low
•leakage monitoring
•additional "AUX" alarm of each pump
•"external" fault (only HSK25 in case of continuous level measurement)
Faults are signalled by means of a red LED, an internal buzzer, or with up to three voltage free alarm
relays. The control unit features three alarm relays by means of which alarms can flexibly be given.
Which alarm is signalled by which relay, as well as the polarity of the relay contacts are
programmable. Using the internal terminal block, the relays can optionally be supplied with either
230V~ control voltage or with the internal 12V DC voltage.
4.4 Operation and Displays
For display purposes, the control unit features a two-line LCD-Display, 16 digits. The displays appear
in clear-text in the selected country’s language (English, French, Italian, Dutch or German). A green
LED signals the unit is ready for operation, a red LED indicates faults. The operation of the unit is
effected by means of three keys (▲, OK, ▼) (picture 2 below). Optionally, the control unit features
additional keys or toggle switches for the 0-Hand-Automatic mode (picture 1 below).

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Operating the manual motor starters, RCD's or the main switch is effected by using the knobs of the
respective device.
4.5 Rechargeable battery operation
The control unit can be operated with a rechargeable battery so that in case of a 230V~ control voltage
loss the unit will continue to operate. The battery is recharged by the unit and can be used together with
the potential free SPDT contacts of the alarm relay to give an alarm.
5 Operation and Displays
In this chapter, the operation of the control unit is described. Operation and display structure is
organised in the Main Menu, in which displays and operation steps necessary for normal function are
carried out and shown, and in System Menus, by means of which the control is parameterised. Each
menu consists of a sequence of images in the LCD Display. Scrolling from display to display is
effected by means of arrow keys (▲▼).
5.1 Main menu
The following diagram shows the menu structure of the control.
Using the arrow keys (▲▼) you can scroll up and down the contents of the menu. Using the OK-key
•the alarm buzzer in the Main display can be switched off and the alarms can be reset
P1AI 09,9A 999cm
P2A0 00,0A HW
Buzzer
Off
Operating Mode P2
ON
Operating Mode P1
OFF
Operating Mode P1
ON
Operating Mode P2
AUTOMATIC
Level Messurement
Pump Data
Communication
Alarms
Reset
Alarms ok
ok
ok
ok
okok
Operating Mode P2
OFF
Operating Mode P1
AUTOMATIC
okok
Operating Mode P1
AUTOMATIC
Operating Mode P2
AUTOMATIC

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•the operation mode of the pumps in the menu “Operation mode” can be changed,3
•one of the system menus can be selected
5.2 Main display
In the standard display, the control will indicate the operational state of the pumps, the current draw of
the pumps and the measured level, e.g.:
P1:IA 5,7A 074cm
P1:0A 0,0A
The displayed values, however, depend largely on the status of the control as well as on the
parameter settings and present fault occurrences. The different variants of indication are more
precisely explained as follows:
Single pump operation
P1:IA 5,7A 074cm
Dual pump operation:
P1:IA 5,7A 074cm
P2:0M 0,0A
Pump P1 is running (I) in automatic operation mode (A), current draw 5,7 A, level 74 cm
Pump P2 is switched off (0) in manual operation mode (M), current input 0,0 A
Operation with one float switch
P1:IA 5,7A 0
P1:0M 0,0A
Operation with two floats
P1:IA 5,7A 1 0
P1:0M 0,0A
Operation with three floats
P1:IA 5,7A 1 0 0
P1:0M 0,0A
float 1 float 2 float 3
1: float switched on (above)
0: float not switched on (below)
3When using CPS-Version with 4/5 operation keys or manual operation mode switches, the above
menus are not present
Standard settings
see Chapter 7

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High water indication
P1:IA 5,7A 074cm
P1:0A 0,0A HW
Failure in measuring system
P1:IA 5,7A ???cm
P1:0A 0,0A
Start delay
... 3sec 074cm
The start delay is effective (after the first initial start or after a mains voltage failure) or when the
control has been switched off by the external input; both pumps are switched off. The indicated time
period is the time period remaining before control unit restarts.
Pump faults / mains failure
In case of a pump fault or phase loss / incorrect phase sequence, the display flashes
the indication as shown below alternatively along with the fault message, for example:
Fault
P1MS
(For further details on the fault indication, see Chapter 6)
other indications
After the control unit has finished its initialisation, in the lower right hand corner, a flashing triangle will
indicate that the unit is using mains supply or by a flashing battery symbol in case the rechargeable
battery is being used.
5.3 Pump operation mode
The operation mode for each pump can be changed between the operation modes: AUTOMATIC,
manual ON and manual OFF. HSK is available in three types:
•Change of operation mode using menus
•Change of operation mode using additional control key(s)
•Change of operation using additional toggle switches
5.3.1 Change of pump operation mode using menus
In the menu “Operation mode”, each pump can be changed to the operation modes: AUTOMATIC,
manual ON and manual OFF. The change is effected by pressing the OK-key. The current state of
operation is then indicated in the menu.

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0M = Manual OFF
IM = Manual ON
0A = Automatic operation mode OFF
IA = Automatic operation mode ON
It is to be observed:
In case the pump is switched to the manual ON operation mode, this pump will only start if there is no
fault present. If in a two pump operation mode, one pump is switched to OFF, the control continues to
function as a single pump control, if the other pump is in the AUTOMATIC operation mode.
5.3.2 Change of operation mode - additional keys
By means of an additional key for each pump, next to the main control keys, each pump can be
changed to the following operation modes: AUTOMATIC, manual ON and manual OFF. The change is
effected by pressing the OK-key. The current state of operation is then indicated in the main menu.
0M = Manual OFF
IM = Manual ON
0A = Automatic operation OFF
IA = Automatic operation ON
It is to be observed:
In case the pump is switched to the manual ON operation mode, this pump will only start if there is no
fault present. If in a two pump operation mode, one pump is switched to OFF, the control continues to
function as a single pump control, if the other pump is in the AUTOMATIC operation mode.
5.3.3 Change of operation mode by means of external switches
By means of toggle switches fixed to the housing cover, the operation mode of the pump can be
switched between operation modes: AUTOMATIC, manual ON and manual OFF.
Switching is effected electromechanically independent of the control and therefore it is also effective in
case of control unit drop-out.
However, the function of the thermo contacts is guaranteed. It means that in case of opened thermo
contacts (over-temperature ) manual operation is not possible.
It is to be observed:
In case the pump is switched to the manual ON operation mode, this pump will only start if there is no
fault present. If in a two pump operation mode, one pump is switched to OFF, the control continues to
function as a single pump control, if the other pump is in the AUTOMATIC operation mode.
5.4 System menus and settings
Readouts of adjustment values of the control as well as change of operation parameters is effected in
5 submenus:
•Level measurement
•pump data

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•communication
•alarms
•system indications
By pressing the OK-key the relevant submenus (system menus) can be accessed. Here, specific
values can be viewed and/ or changed.
By means of the arrow keys (▲▼) scrolling from menu to menu is possible. By pressing the OK key in
the menu point "back to main menu" the main menu is displayed again.
By pressing the OK key in all other menu points, the input mode of the respective menu point is
accessed. The input mode is marked by a ↵-sign, in the LCD Display on the lower right hand side.
By means of arrow keys (▲▼), the values can be selected and by pressing the OK key the values can
be changed. If entering a multi-digit number is required, the highest digit is changed first. With the OK
key the next digit position is selected etc.
If a value needs to be changed, the OK key must be pressed first.
Before carrying out settings for the first time, however, a password must be entered. If, the OK key is
pressed in a menu point for the first time, entering a password is requested:
Password:
Using the arrow keys (▲▼), a respective position within the password can be changed. Using the OK
key, the next position up to the fourth position can be selected. If the valid password has been
entered, in future, the adjustment values can be directly changed. The factory default password is
0000. If the wrong password has been entered, the message "false password” appears. Prompting of
the password appears until the correct password has finally been entered. Once the correct password
has been entered and confirmed by pressing the OK key, all setting values can be changed and the
controller can be configured.
Should a key not be pressed for approx. 5 minutes, the control returns to the main display and the
validity of the password expires. The password must be entered again.
5.5 Messages after starting the system
When the HSK is switched on, self checking of the program memory is conducted. A message
"Checking ROM" is displayed. In case of a fault, the control unit is stopped and the fault message
"contact service" is indicated. In case of this message, the CPS unit is not operable and for security
reasons will not start.
When self checking is successful, a message is briefly displayed, for example:
Mode: 03EE
Modem: 0

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This message is not important for the user and it indicates only the internal configuration for service
purposes. Subsequently the copyright message with the SW-version number is indicated for approx.
1sec. After this, the HSK initiates the start delay time.
6 System menus
6.1 Level measurement
6.2 In the menu "Level measurement", the level measurement method, setpoints, high water levels
as well as the minimum pressure (level measurement with bubbler system) are specified.
Cut-Out Level
Pump 1: 0030cm
Cut-Out Level
Pump 2: 0031cm
Cut-In Level
Pump 1: 0040cm
Cut-In Level
Pump 2: 0061cm
Alarm Level
0091cm
Level Messurement
4...20mA 0250cm
Automatic
Zero Adjustment
Filter (0-9999)
0000
Minimum Pressure
0005cm
... back to
Main Menu
6.1.1 Level measurement setting
In this menu, the level measurement method is determined. After pressing the OK-key, the level
measurement method can be selected by means of the ▲- or ▼-key. Following possibilities are
available:
•level measurement 4… 20mA interface through level sensor, measuring range adjustable from
0100cm (1meter WC up to 1000cm (10 meters WC)
•internal impact pressure sensor (measuring range 0 … 200 cm WC
•1 x float switch
•2 x float switches
•3 x float switches (only possible with HSK25 in dual pump operation)
After the measuring method has been selected, it must be confirmed with the OK-key
If a 4-20mA level sensor has been selected as measurement method, then after pressing the OK-key,
the measuring range of the connected sensor must be additionally entered in cm.

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For example, for a HOMA LLS with measuring range of 2,5m - the value of 0250cm is entered.
Important information: If values for the measuring range < 0100cm are entered, then the control
inserts the minimum value of 100cm , in case of values >1000cm, the control inserts the maximum
value of 1000cm. If “3x float switches” has been selected and the unit is subsequently switched to a
single pump operation, then the control unit switches automatically back to the measurement type - 2x
float switches!
6.1.2 Zero adjustment
During level measurement it is of particular importance that zero point measurement be as exact as
possible in order to minimise the risk of the pumps running dry. In this menu, therefore, the zero point
of the level measurement can be exactly calibrated. Following remarks are to be observed:
During zero point calibration, the measuring device shall not be in the water, that is, the level sensor
must be pulled out of the water. A working level sensor is to be connected. If the internal impact
pressure sensor is used for measuring, the wet bell must be pulled out of water. Furthermore, it must
be guaranteed that the measurement system is absolutely still during the zero calibration process.
After preparations in this menu point – zero adjustment, the OK key must be pressed, select "YES"
using the ▲- or ▼-keys and confirm with the OK key. The automatic zero calibration is now initiated. In
second row of the display, the unit's calculated correction value appears after a short time, Zero
adjustment is herewith finished. This value is stored and is valid until the next zero adjustment is
carried out. Zero adjustment can be repeated at any time. Should the control be operated with float
switches, the zero adjustment menu will not be displayed.
6.1.3 Filter
In case of fluctuating water levels, level indication may fluctuate as well. This can be compensated by
means of a low-pass filter and a more inert level registration can be adjusted.
0000 = Filter OFF
0001 = weaker (faster) Filter … 9999 stronger (slower) Filter
If the control unit is operated with a float switch, the filter menu will not appear.

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6.1.4
Minimum pressure4
When a bubbler system is used, then the pump must produce a minimum pressure. This pressure can
be monitored. When the level measurement falls below the adjusted pressure, a fault message is
generated. Entering a value of 0000cm will deactivate minimum pressure monitoring. This function can
also be used when a level should not drop below a given set point.
6.1.5 Cut-in, cut-out and alarm levels
In this menu, setpoints for the pumps are entered and displayed, for example:
Cut-out level
1.pump: 0030cm
For single and dual pump control in alternating operation mode, one pair of On and Off setpoints must
be entered. For a dual pump control in peak load operation, two pairs of ON and OFF setpoints are
required. Additionally, a high water setpoint must be entered.
For entering, press the OK key (on the lower right the ↵-sign appears).
Now, with the arrow keys, the value of the highest digit can be changed. Using the OK key, the next
position is selected etc.
When entering the last digit is effected, on the lower left a ? sign may possibly appear (instead of the
↵-sign). This means that the selected setpoints are inconsistent, for example, a cut-out level is higher
than a cut-in level. When the data is consistent, then the ? sign will not appear and the ↵-sign
disappears after entering the last digit.
When the control unit operates with float switches, then setpoints are not shown.
4When the control operates with float switches, the minimum pressure menu is not displayed.
Note: When the filter is active, the level indication can be so inert that the measured
level may deviate greatly from the level in the shaft.
The shaft may have already been emptied, the measured value, however, still indicates
a level above the cut-out setpoints and the pump may possibly run dry. Therefore,
p
um
p
ca
p
acit
y,
set
p
oints
,
and filter values must be well in balance with each other.

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HOMA Pump Technology - 17 -
6.2 Pump data
In this menu all pump relevant parameters are set . The menu has the following structure
Run-On Time
0003sec
Max. allowable
pump run time
0300sec
Rated Current P1
06,0 A
Time Start Delay
P1->P2
Rated Current P2
06,0A
... back to
Main Menu
Load rotation
after 0300sec
6.2.1 Run-on time
In this menu the run-on time is set (in sec). The run-on time is the time period, during which the
pump(s) continue to run, after the level has fallen below the cut-out level. A value of 0000 deactivates
this function.
6.2.2 Pump run time limitation
The run time of the pumps can be limited to a max. adjustable run time. If the pump runs
uninterruptedly longer than the set time period, an alarm is given. In case of a dual pump control,
rotation of the pumps is additionally effected. A value of 0000 deactivates this function.
6.2.3 Pump rotation when using dual pump control
In this menu point, the behaviour of the control concerning pump rotation can be determined.
When entering a value of "0000", pump rotation is effected only after both pumps have been switched
off. If a value between "0001" and "9998" is entered, then pump rotation is effected after both pumps
have been switched off, at the latest after the set time period (in seconds) has elapsed.
Entering a value of "9999" deactivates the pump rotation function, that is the control starts basically
with pump 1 and pump 2 is always the peak load pump. Note: In the case of pump rotation function
(1/1) and a value of "9999", pump 2 is never switched on automatically!

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6.2.4 Time delay start when using dual pump operation
When the level exceeds the second upper setpoint or in case of high water, then both pumps run
simultaneously under peak load operation mode. In order reduce possible mains overload caused by
the inrush currents of the pumps, the second pump is switched on after a time delay. The delay time
can be set here. The time delay should be selected such that the second pump is switched on only
after of the inrush current of the pump 1 has dropped.
Note: This function is not effective in case the second pump has been switched on manually.
6.2.5 Rated pump current
For electronic current monitoring, the rated operating current of the pump must be set. If the current
exceeds the rated value, an alarm is given after a certain time period. The more the current exceeds
the rated value the shorter this time period is before an alarm is given.
If the measured current falls below half the value of the rated current, then an under-current alarm is
given5.
In order to ensure a safe function, the entered value should be approx. 10%, that of the current
showed in the display (under normal operation conditions).
Entering a value of 00.0A deactivates current monitoring. Current indication then is only that of an
ampere meter.
6.3 Communication
This menu appears only, if the HSK features SCADA functions. The adjustment and setting
possibilities in this menu point are described in a separate manual.
6.4 Alarms
In this menu behaviour of the control in case of faults is described. The menu has the following
structure:
5Not in case of HSK controls featuring manual 0-Manual-Automatic switch(es)

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allowed
T1-Alarms: 3
Alarm Auto reset
mask: FFFFFF00
Alarm Buzzer
ON
Alarm Relais 3
NC
Mask REL1
7FFFFFFF
Mask REL2
0007FF00
Mask REL3
7FF00000
... back to
Main Menu
High water alarm
delay 0000sec
Alarm Relais 1
NC
Alarm Relais 2
NC
In some parts of the alarm menus, it is required that a “mask word” be entered. Here, the fundamental
function, however, should be explained in advance. HSK can recognise up to 31 different errors.
Further processing of these errors is controlled by the mask word. The mask word defines whether in
case of a fault occurrence, the fault is assigned to one of the alarm relays6(Mask Relays 1,2,3) or
whether an automatic reset is enabled for the fault (Alarm Auto reset mask) respectively. Therefore, in
all, four mask words must be determined.
In the control, each fault in a 32 bit binary number is allocated one bit. If the fault occurs, then this bit
is set (1), otherwise its value is (0).
When a fault event is now to be signalised, for example by alarm relay 1, then in the mask this bit
must also be set to (1). If the bit in the mask is set to (0), then the fault is recognised and processed in
the control, but it is not transferred to the relay.
If, for example, only the high water bit is set in the mask, then only a high water fault is indicated by
the alarm relay. For example only bits 9...20 which belong to pump1, can be allocated to relay 2.
6The control unit HSK15 has 2 alarm relays, the control unit HSK25 has 3 alarm relays. In case of
HSK15, the menu points for the 3rd alarm relay do not appear.