Grundfos SLC Series User manual

GRUNDFOS INSTRUCTIONS
SLC, DLC
Simplex and Duplex pump control panels
Installation and operating instructions

English (US)
2
English (US) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions describe SLC, DLC
pump control panels.
Sections 1-5 give the information necessary to be able to unpack,
install and start up the product in a safe way.
Sections 6-13 give important information about the product, as
well as information on service, fault finding and disposal of the
product.
CONTENTS
Page
1. Limited warranty 3
2. General information 3
2.1 Symbols used in this document 3
2.2 Other important notes 3
3. Receiving the product 4
3.1 Unpacking the product 4
3.2 Inspecting the product 4
3.3 Temporary storage after delivery 4
3.4 Applications 4
4. Installing the product 6
4.1 Location 6
4.2 Mechanical installation 7
4.3 Electrical connection 7
5. Starting up the product 12
6. Liquid level control 13
6.1 Float switches 13
6.2 Submersible analog level pressure transducer 14
6.3 System for one pump (SLC) and three float switches 15
6.4 System for one pump (SLC) and submersible level
transducer, and two optional backup float switches 15
6.5 System for two-pump (DLC) operation with four float
switches 16
6.6 System for two-pump operation (DLC) with
submersible level transducer and two backup float
switches 16
7. Product introduction 17
7.1 Identification 17
7.2 Type key 18
7.3 Approvals 18
8. Product range 19
8.1 SLC, float-switch-controlled option 19
8.2 SLC, transducer-controlled option 19
8.3 DLC, float-switch-controlled option 20
8.4 DLC, transducer-controlled option 20
8.5 Additional options 20
9. Functions 21
9.1 SLC, float-switch-controlled option 21
9.2 SLC, transducer-controlled option 21
9.3 DLC, float-switch-controlled option 22
9.4 DLC, transducer-controlled option 22
9.5 Digital input and output screens 23
9.6 Screen navigation 25
9.7 Control panel operation 26
9.8 Pump alternation 30
9.9 Adjustable parameters 31
10. Servicing the product 41
10.1 Maintaining the product 41
11. Fault finding the product 42
12. Technical data 42
12.1 Dimensions, SLC 43
12.2 Dimensions, DLC 44
13. Disposing of the product 45
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
The use of this product requires experience with and
knowledge of the product. Persons with reduced
physical, sensory or mental capabilities must not use
this product, unless they are under supervision or
have been instructed in the use of the product by a
person responsible for their safety. Children must not
use or play with this product.
CAUTION
Successful operation depends on careful attention to
the procedures described in this manual. Keep this
manual for future use.

3
English (US)
1. Limited warranty
New equipment manufactured by seller or service supplied by
seller is warranted to be free from defects in material and
workmanship under normal use and service for a minimum of
twelve (12) months from date of installation, eighteen (18) months
from date of shipment, unless otherwise stated in product warranty
guide (available upon request). In the case of spare or
replacement parts manufactured by seller, the warranty period
shall be for a period of twelve months from shipment. Seller's
obligation under this warranty is limited to repairing or replacing, at
its option, any part found to its satisfaction to be so defective,
provided that such part is, upon request, returned to seller's
factory from which it was shipped, transportation prepaid. Parts
replaced under warranty shall be warranted for twelve months
from the date of the repair, not to exceed the original warranty
period. This warranty does not cover parts damaged by
decomposition from chemical action or wear caused by abrasive
materials, nor does it cover damage resulting from misuse,
accident, neglect, or from improper operation, maintenance,
installation, modification or adjustment. This warranty does not
cover parts repaired outside seller's factory without prior written
approval. Seller makes no warranty as to starting equipment,
electrical apparatus or other material not of its manufacture. If
purchaser or others repair, replace, or adjust equipment or parts
without seller's prior written approval, seller is relieved of any
further obligation to purchaser under this paragraph with respect
to such equipment or parts, unless such repair, replacement, or
adjustment was made after seller failed to satisfy within a
reasonable time seller's obligations under this paragraph. Seller's
liability for breach of these warranties (or for breach of any other
warranties found by a court of competent jurisdiction to have been
given by seller) shall be limited to: (a) accepting return of such
equipment exw plant of manufacture, and (b) refunding any
amount paid thereon by purchaser (less depreciation at the rate of
15 % per year if purchaser has used equipment for more than
thirty [30] days), and canceling any balance still owing on the
equipment, or (c) in the case of service, at seller's option, redoing
the service, or refunding the purchase order amount of the
service or portion thereof upon which such liability is based.
These warranties are expressly in lieu of any other warranties,
express or implied, and seller specifically disclaims any implied
warranty of merchantability or fitness for a particular purpose, and
in lieu of any other obligation or liability on the part of the seller
whether a claim is based upon negligence, breach of warranty, or
any other theory or cause of action. In no event shall seller be
liable for any consequential, incidental, indirect, special or
punitive damages of any kind. For purposes of this paragraph, the
equipment warranted shall not include equipment, parts, and work
not manufactured or performed by seller. With respect to such
equipment, parts, or work, seller's only obligation shall be to
assign to purchaser the warranties provided to seller by the
manufacturer or supplier providing such equipment, parts or work.
No equipment furnished by seller shall be deemed to be defective
by reason of normal wear and tear, failure to resist erosive or
corrosive action of any fluid or gas, purchaser's failure to properly
store, install, operate, or maintain the equipment in accordance
with good industry practices or specific recommendations of
seller, including, but not limited to seller's installation and
operation manuals, or purchaser's failure to provide complete and
accurate information to seller concerning the operational
application of the equipment.
2. General information
2.1 Symbols used in this document
The text accompanying the three hazard symbols DANGER,
WARNING and CAUTION will be structured in the following way:
Example
2.2 Other important notes
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning
- Action to avoid the hazard.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
A blue or grey circle with a white graphical symbol
indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with
a black graphical symbol, indicates that an action
must not be taken or must be stopped.
If these instructions are not observed, it may result
in malfunction or damage to the equipment.
Notes or instructions that make the work easier and
ensure safe operation.

English (US)
4
3. Receiving the product
3.1 Unpacking the product
• Check that the product received is in accordance with the
order.
• Check that the voltage, phase and frequency of the product
match the voltage, phase and frequency of the installation site.
• During unpacking and prior to installation, make sure that the
product is not dropped or mishandled.
3.2 Inspecting the product
• Check the product for defects and damage immediately after
receiving it.
• If any equipment is damaged in transit, promptly report this to
the carrier's agent. Make complete notations on the freight bill.
3.3 Temporary storage after delivery
If the product is not to be installed and operated immediately after
receiving it, store it in a clean, dry area at a moderate ambient
temperature.
3.4 Applications
3.4.1 SLC and DLC pump control panels
Grundfos SLC and DLC pump control panels are designed for
level control, monitoring and protection of pumps in wastewater,
water supply and drainage systems.
SLC and DLC pump control panels are designed for emptying
(water removal) applications. (For boosting applications, see the
Grundfos BoosterpaQ product line.)
The SLC and DLC control panel product range comprises up to
45 A / 15 hp (P2), direct-on-line starting (DOL).
Fig. 1 Grundfos DLC pump control panel
Fig. 2 Outer front door and dead-front inner door
Fig. 3 HMI operating panel with keypad and text display
Leave the product in the packing until you are ready
to install it. The packing is specially designed to
protect the product from damage.
TM06 7247 3116
TM06 6927 3316TM06 6847 3316
Dead-front
inner door
Front
door
Alarm
beacon

5
English (US)
3.4.2 SLC, for one pump (Simplex)
Float-switch-controlled option
The SLC, float-switch-controlled option, enables control of one
(1) pump, utilizing the following float switch inputs:
– high water-level alarm
– pump on
– pump off.
Transducer-controlled option
The SLC, transducer-controlled option, enables control for one
(1) pump, utilizing an analog submersible level transducer with
float-switch alarms:
– 4-20 mA (analog) water-level detection for duty and standby
pump control
– high water-level alarm float switch
– low water-level alarm float switch.
3.4.3 DLC, for two pumps (Duplex)
Float-switch-controlled option
The DLC, float-switch-controlled option, enables control of two (2)
pumps, utilizes the following inputs:
– high water-level alarm
– duty pump on
– standby pump on
– pump(s) off.
DLC, transducer-controlled option
DLC, transducer-controlled option, enables control of two (2)
pumps, utilizing an analog submersible level transducer with
float-switch alarms:
– 4-20 mA (analog) water-level detection for duty and standby
pump control
– high water-level alarm float switch
– low water-level alarm float switch.
3.4.4 Application examples
Fig. 4 Application examples
* As standard, transducer-controlled panels have high- and low-level float-switch backup inputs for pump operation and alarm
conditions. It is optional to use these float switches.
TM06 6938 2716
SLC, float-switch-
controlled option
SLC, transducer-
controlled option
(analog, submersible
transducer with float-
switch backup)*
DLC, float-switch-
controlled option
DLC, transducer-
controlled option
(analog, submersible
transducer with float-
switch backup)*

English (US)
6
4. Installing the product
4.1 Location
Do not install SLC, DLC pump control panels, and the intrinsically
safe version (with Ex barrier), if required, in potentially explosive
areas. Use only float switches approved for use in potentially
explosive areas. Connect the float switches via the Ex barrier in
the intrinsically safe version of the SLC, DLC pump control panel.
Install the SLC,DLC pump control panels at ambient
temperatures from -22 °F to +122 °F (-30 °C to +50 °C).
Enclosure class: NEMA4X.
WARNING
Arc flash and electric shock hazard
Death or serious personal injury
- Wear appropriate personal protective equipment
(PPE) and tools while working on this equipment.
CAUTION
Toxic material
Minor or moderate personal injury
- Before starting any work on pumps used to pump
liquid which could be constituted as being
hazardous to health, clean and vent pumps, pits,
etc. thoroughly according to local regulations.
DANGER
Electric shock
Death or serious personal injury
- The installation must be carried out by authorized
personnel in accordance with local regulations.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, pumps,
pits, etc., make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the system, switch off
the power supply and lock the main disconnect
switch in the Off position. Switch off any external
voltage connected to the system before working on
the system.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump control panel in accordance
with the rules and standards in force for the
application in question.
DANGER
Electric shock
Death or serious personal injury
- The operating voltage and frequency are marked
on the controller nameplate. Make sure that the
controller is suitable for the power supply.
DANGER
Explosion
Death or serious personal injury
- Float switches placed in a potentially explosive
area must be connected via the intrinsically safe
version of the SLC. Do not install the intrinsically
safe version of the SLC with Ex barrier in the
potentially explosive area.
DANGER
Explosion
Death or serious personal injury
- Equipment used in potentially explosive areas
must be approved for the particular application
in each individual case. Furthermore, route the
cables into the potentially explosive area in
accordance with local regulations.
Use float switches of the same type as Grundfos
product numbers 98365984, 98365985 and
98365986, i.e. float switches with gold-plated
contacts suitable for low voltages and currents (40 V/
100 mA). All Ex-approved float switches are also
suitable. Connect the float switches as NO contacts,
i.e. brown and black leads, when using float
switches, Grundfos product numbers 98372085,
98372086 and 98372087.
Connect single-phase motors to an external
operating capacitor and in certain cases also to a
starting capacitor. Further details can be found in the
installation and operating instructions for the pump in
question.

7
English (US)
4.2 Mechanical installation
4.2.1 Mounting the product
Before mounting the control panel, remove the transport
protectors, if any, from inside the cabinet.
Mount the control panel on a plane and flat wall surface, with the
Pg cable entries pointing downwards. Fit any additional Pg cable
entries, if required, in the bottom plate of the cabinet.
4.3 Electrical connection
If you install the product outdoors, place it in a
protective shed or cupboard.
Do not expose the product to direct sunlight.
WARNING
Arc flash and electric shock hazard
Death or serious personal injury
- Wear appropriate personal protective equipment
(PPE) and tools while working on this equipment.
CAUTION
Toxic material
Minor or moderate personal injury
- Before starting any work on pumps used to pump
liquid which could be constituted as being
hazardous to health, clean and vent pumps, pits,
etc. thoroughly according to local regulations.
DANGER
Electric shock
Death or serious personal injury
- The installation must be carried out by authorized
personnel in accordance with local regulations.
DANGER
Electric shock
Death or serious personal injury.
- Before starting any work on the product, pumps,
pits, etc., make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the system, switch off
the power supply and lock the main disconnect
switch in the Off position. Switch off any external
voltage connected to the system before working on
the system.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump control panel in accordance
with the rules and standards in force for the
application in question.
DANGER
Electric shock
Death or serious personal injury
- The operating voltage and frequency are marked
on the controller nameplate. Make sure that the
controller is suitable for the power supply on
which it will be used.
DANGER
Explosion
Death or serious personal injury
- Float switches placed in a potentially explosive
area must be connected via the intrinsically safe
version of the SLC. Do not install the intrinsically
safe version of the SLC with Ex barrier in the
potentially explosive area.
DANGER
Explosion
Death or serious personal injury
- Equipment used in potentially explosive areas
must be approved for the particular application
in each individual case. Furthermore, route the
cables into the potentially explosive area in
accordance with local regulations.
Use float switches of the same type as Grundfos
product numbers 98365984, 98365985 and
98365986, i.e. float switches with gold-plated
contacts suitable for low voltages and currents (40 V/
100 mA). All Ex-approved float switches are also
suitable. Connect the float switches as NO contacts,
i.e. brown and black leads, when using float
switches, Grundfos product numbers 98372085,
98372086 and 98372087.
Connect single-phase motors to an external
operating capacitor and in certain cases also to a
starting capacitor. Further details can be found in the
installation and operating instructions for the pump in
question.

English (US)
8
4.3.1 Wiring diagrams
SLC, float-switch-controlled option
Fig. 5 Wiring diagram, SLC with float switches
TM06 6855 2516
H*H1
X1 X2
F1 F2
L1 N
+ -
L1
L3
L2 T2L2
T1L1
L3 T3
OLR
xxA
CB xxA K11
1
CB 10A
L+ M
i5
1i1
4
NIBP
21 22
K02
i6
+ -
L1
L2
L3
i3
3
4
i2
2
4
21 22
K03
98
K01
1112 1411
10
K11
A1
Q1
Q4
+-
A
A2
K02
A2A1
GX2
X1
11 14
K02
K03
A2A1
6 5
96 95
OLR
R
K01
A2A1
7
11 14
K03
Q3
Factory wire
Field wire
Pump
XXX VAC, 3-phase, XX hp
High-level alarm
float switch
Pump on float
switch
Pump off float
switch
Pump fault
Pump overtemperature sensor
Seal sensor
Push-to-Silence alarm
Fuses 2A
Control panel
transformer
XXXV - 120 V, 100 VA
Control panel
115 VAC PLC text display
24 VDC power
supply
PLC
Motor contactor
Pump run light
Beacon alarm light
Alarm relay
Audible alarm
Pump overload relay or
overtemperature sensor
Pump seal-failure sensor
Hand Auto
OFF
From main power panel
XXX VAC, 3-phase, 60 Hz
Main disconnect switch provided by others
Ground wire
To LOGO
From
display
screen
24 V
power supply
LOGO
Alarm contact

9
English (US)
SLC, transducer-controlled option
Fig. 6 Wiring diagram, SLC with submersible analog level pressure transducer
TM06 6858 2516
H*H1
X1 X2
F1 F2
L1 N
+ -
L1
L3
L2 T2L2
T1L1
L3 T3
OLR
xxA
CB xxA K11
1
CB 10A
L+ M
i5
NIBP
21 22
K02
i6
+ -
L1
L2
L3
21 22
K03
1i1
i2
i8
500
Ohm
3
23
Trans
+
24V -
-
87
K01
1112 1411
9
K11
A1
Q1
Q4
+-
A
A2
K02
A2A1
GX2
X1
11 14
K02
K03
A2A1
5 4
96 95
OLR
R
K01
A2A1
6
11 14
K03
Q3
Factory wire
Field wire
Pump
XXX VAC, 3-phase, XX hp
High-level alarm float
switch
Pressure transducer
Low-level alarm float
switch
Pump failure
Pump over-
temperature sensor
Seal sensor
Push-to-Silence alarm
Fuses 2A
Control panel - transformer
XXXV - 120 V, 100 VA
Controls
115 VAC PLC
text display
24 VDC
power supply
PLC
Motor contactor
Pump run light
Beacon alarm light
Alarm relay
Audible alarm
Pump overload relay or
overtemperature sensor
Pump seal-failure sensor
Hand Auto
OFF
From main power panel
XXX VAC, 3-phase, 60 Hz
Main disconnect switch provided by others
Ground wire
To LOGO
From
display
screen
24 V
power supply
Alarm contact
LOGO

English (US)
10
DLC, float-switch-controlled option
Fig. 7 Wiring diagram, DLC with float switches
TM06 6854 2516
1312
K01
1112 1411
14
K11
A1
Q1
K12
Q2
Q3
Q4
+-
A
A2
A1 A2
K02
A2A1
GX2
X1
GX2
X1
11 14
K02
11 14
K04
21 22
K04
i7
K03
A2A1
7 6
K04
A2A1
K05
A2A1
10 9
11
96 95
OLR1
96 95
OLR2
R
K01
A2A1
8
11 14
K03
11 14
K05
21 22
K03
21 22
K03
H*H1
X1 X2
F1 F2
L1 N
+ -
L1
L3
L2
CB xxA
T2L2
T1L1
L3 T3
T2L2
T1L1
L3 T3
OLR2
XXA
OLR1
xxA
CB xxA K11
K12
1
2
CB 10A
L+ M
i5
1i1
i4
5
45
NIBP
21 22
K02
i6
+ -
L1
L2
L3
i3
35
i2
25
Factory wire
Field wire
Pumps
XXX VAC, 3-phase
XX hp
High-level alarm
float switch
Standby pump on
float switch
Duty pump on float
switch
Pumps-off float switch
Pump 1 failure
Pump 2 failure
Pump 1 over-
temperature sensor
Seal sensor 1
Pump 2 over-
temperature sensor
Seal sensor 2
Push-to-Silence alarm
Fuses 2A
Controls - transformer
XXXV - 120 V, 100 VA
Control panel
115 VAC
PLC text display
24 VDC
power supply
PLC
Motor contactor
Pump run light
Motor contactor
Pump run light
Beacon Alarm Light
Alarm relay
Audible Alarm
Alarm contact
Pump 1 overload relay or
overtemperature sensor
Pump 1 seal-failure sensor
Hand
Hand
Auto
Off
Off
Auto
From main power panel
XXX VAC, 3-phase, 60 Hz
Main disconnect switch provided by others
Ground wire
To LOGO
From
display
screen
24 V
power supply
LOGO
Pump 2 overload relay or
overtemperature sensor
Pump 2 seal-failure sensor

11
English (US)
DLC, transducer-controlled option
Fig. 8 Wiring diagram, DLC with submersible analog level pressure transducer
TM06 6859 2616
H*H1
X1 X2
F1 F2
L1 N
+ -
L1
L3
L2
CB xxA
T2L2
T1L1
L3 T3
T2L2
T1L1
L3 T3
OLR2
XXA
OLR1
xxA
CB xxA K11
K12
1
2
CB 10A
L+ M
i5
NIBP
21 22
K02
i6
+ -
L1
L2
L3
1i1
i2
i8
500
Ohm
3
2
3
Trans
+
24V -
-
1110
K01
1112 1411
12
K11
A1
Q1
K12
Q2
Q3
Q4
+-
A
A2
A1 A2
K02
A2A1
GX2
X1
GX2
X1
11 14
K02
11 14
K04
21 22
K04
i7
K03
A2A1
54
K04
A2A1
K05
A2A1
8 7
9
96 95
OLR1
96 95
OLR2
R
K01
A2A1
6
11 14
K03
11 14
K05
21 22
K03
21 22
K03
Factory wire
Field wire
Pumps
XXX VAC, 3-phase
XX hp
Pump 1 over-
temperature sensor
Seal sensor 1
Pump 2 over-
temperature sensor
Seal sensor 2
Fuses 2A
Control panel - transformer
XXXV - 120 V 100 VA
Controls
115 VAC PLC text display
24 VDC power
supply
PLC
Motor contactor
Pump run light
Motor contactor
Pump run light
Beacon Alarm Light
Alarm relay
Audible Alarm
Alarm contact
Pump 1 overload relay or
overtemperature sensor
Pump 1 seal-failure sensor
Pump 2 overload relay or
overtemperature sensor
Hand
Hand
Auto
Off
Off
Auto
From main power panel
XXX VAC, 3-phase, 60 Hz
Main disconnect switch provided by others
Ground wire
To LOGO
From
display
screen
24 V
power supply
Pump 2 seal-failure sensor
LOGO
High-level alarm float
switch
Pressure transducer
Low-level alarm float
switch
Pump 1 failure
Push-to-Silence alarm
Pump 2 failure

English (US)
12
5. Starting up the product
Proceed as follows:
1. Check that the float switches have been connected according
to the wiring diagram for the application.
2. Check that the pump inlet is submerged in the liquid to be
pumped.
3. Observe the warning below. Set the overload relay to the
rated current stamped on the pump motor nameplate.
4. Switch on the power supply.
Three-phase pumps only: Check for wrong phase sequence.
If the phase sequence is wrong, the impeller will rotate
backwards.
5. Check the direction of rotation before startingup the pump. An
arrow on the stator housing of most Grundfos pumps indicates
the correct direction of rotation. For a Grundfos pump, check
that the direction of rotation is clockwise when viewed from
above. See fig. 9. Check the Installation and Operating
Instructions for the pump to verify the correct direction of
rotation.
Fig. 9 The correct direction of rotation is clockwise for most
Grundfos pumps
For Grundfos pumps:
Check the direction of rotation when connecting the pump to a
new installation. The direction of rotation can be checked in the
following way:
• Let the pump hang from a lifting device, e.g. the hoist used for
lowering the pump into the tank.
• Start and stop the pump while observing the movement (jerk)
of the pump. If connected correctly, the pump will rotate
clockwise, i.e. it will jerk counter-clockwise.
• If the direction of rotation is wrong, interchange any two of the
phases in the power supply cable.
• Check that a stop float switch is installed to ensure that the
pump does not dry run. If the pump is dry running, increase
the height of the stop float switch.
•Three-phase pumps: Check that the direction of rotation of
the pump is correct according to the installation and operating
instructions for the pump in question.
• Select the required operating mode by means of the
automatic/manual/off toggle switch.
WARNING
Arc flash and electric shock hazard
Death or serious personal injury
- Wear appropriate personal protective equipment
(PPE) and tools while working on this equipment.
CAUTION
Toxic material
Minor or moderate personal injury
- Before starting any work on pumps used to pump
liquid which could be constituted as being
hazardous to health, a thorough cleaning and
venting of pumps, pits, etc. must be carried out
according to local regulations.
DANGER
Electric shock
Death or serious personal injury
- Startup must be carried out by authorized
personnel in accordance with local regulations.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, pumps,
pits, etc., make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Set the overload relay to the rated current
stamped on the pump motor nameplate.
TM06 8228 4816

13
English (US)
6. Liquid level control
6.1 Float switches
SLC and DLC control panels are available with float switches for
automatic level control. Float switches are available as
accessories. Grundfos float switches are of the non-mercury type
and are available for standard and explosion-proof pumps. The
hermetically sealed polypropylene housing and polyurethane
cable make Grundfos float switches resistant to many chemicals,
e.g. alcohol, uric acid, sewage, oils, gasoline and fruit acid.
6.1.1 SLC
The SLC can be fitted with up to three float switches:
• Minimum: Stops the pump.
• Maximum: Starts the pump.
• Alarm (optional): Indicates high water level or pump failure.
6.1.2 DLC
The DLC can be fitted with up to four float switches:
• Minimum: Stops both pumps.
• Maximum 1: Starts one pump.
• Maximum 2: Starts the other pump.
• Alarm (optional): Indicates high water level or pump failure.
6.1.3 Locating and positioning the float switches
Install the float switches in the water collecting tank or pit floating
on the pumped liquid.
A float switch is an accepted way of controlling liquid levels in
tanks, pits, etc.
The position of the float switches determines when the SLC or
DLC will start and stop the pump(s).
6.1.4 Function of the float switches
Suspend the float switch, encased in a drop-shaped
polypropylene housing, at the desired height by its own three-
core cable. When the liquid reaches a certain level, the float
switch will tip either up or down, causing the contact to open or
close.
When the float switch is pointing up, the float switch contact will
be closed and the pump will start.
When the float switch is pointing down, the float switch contact
will be opened and the pump will stop.
Fig. 10 Float-switch positions
TM00 6678 3497
ON
OFF
Grundfos level switches for non-explosion-risk environment Product number
TM05 6647 5012
Grundfos float switch MS1 UL with 33 ft (10 m) cable 98365984
Grundfos float switch MS1 UL with 40 ft (12 m) cable 98365985
Grundfos float switch MS1 UL with 60 ft (18 m) cable 98365986
Cable support of stainless steel for two float switches 98365987
Grundfos level switches for explosion-risk-environment Product number
Grundfos float switch MS1 Ex IECex with 33 ft (10 m) cable 98372085
Grundfos float switch MS1 Ex IECex with 40 ft (12 m) cable 98372086
Grundfos float switch MS1 Ex IECex with 60 ft (18 m) cable 98372087
Cable support of stainless steel for two float switches 98365987

English (US)
14
6.2 Submersible analog level pressure transducer
6.2.1 Applications
• Level measurement in rivers and lakes
• level measurement in vessel and storage systems
• control of sewage lifting and pumping stations
• monitoring of sewage, settling and storm water retention
basins
• optimized for simple measuring requirements in level
measurement
• suitable for permanent level measurement up to a 328 ft (100
m) water column.
Transducer features
• Hermetically sealed, robust stainless-steel case
• fully-welded construction ensuring long life and permanent
sealing
• enclosure class IP68
• 4-20 mA output as standard
• accuracy of 0.5 %
• 65 ft (19.8 m) PUR cable
• measuring range:
0-9 psi (0 - 0.62 bar) / 0 - 20.1 ft (6.04 m)
• temperature ranges
• liquid: 14-122 °F (-10 to +50 °C)
• ambient: 14-122 °F (-10 to +50 °C)
• storage: -22 to +176 °F (-30 to +80 °C)
• power supply: DC 24 V.
Birdcage (sensor guard) features
The birdcage sensor guard protects the sensor from floating
debris. Its weight provides the sensor with stability, even in light
turbulence.
• Birdcage maximum temperature:
-4 to +212 °F (-20 to +100 °C)
• thread: G 1/2B
• weight: approximately 3 lb (1.4 kg)
• height: 1.97 in.
• diameter: 3.81 in.
• material: stainless steel AISI 304 (similar to EN 1.4301).
SLC or DLC with pressure transducer can be set up with float-
switch backup.
Order two float switches for optional high- and low-level backup
of the transducer.
Fig. 11 Grundfos submersible, analog level pressure
transducer kit (sensor and birdcage)
Fig. 12 Sensor dimensions
Fig. 13 Birdcage dimensions
TM06 6891 2516TM06 6896 2616TM06 6895 2616
Grundfos submersible, analog level pressure
transducer kit (see fig. 11)Product number
65 ft (19.8 m) PUR cable, 0-9 psi (0 - 0.62 bar) / 0 -
20.1 ft (6.1 m) measuring range, stainless-steel
birdcage 99045076
3.94 in. (100 mm)
0.393 in.
(10 mm)
0.1.06 in.
(27 mm)
G1/2B
0.708 in.
(18 mm)
3.81 in. (97 mm)
1.97 in. (50 mm) 3.81 in. (97 mm)
Wt 3 lb
(1360 g)
0.20 in.
(5 mm)
0.79 in.
(20 mm)

15
English (US)
6.3 System for one pump (SLC) and three float
switches
Read all the warnings listed in section 4. Installing the product
before you begin any work. For wiring diagrams, see section
4.3 Electrical connection.
For functional information, see section 9.7.1 SLC, float-switch-
controlled option.
Fig. 14 One-pump system (SLC) with three float switches
6.3.1 Electrical connection
For all field connections to the panel, i.e. main power connection,
pump power connection, float switches, pump overtemperature
sensor, seal failure sensor, dry alarm contacts, see wiring
diagram, fig. 5, for terminal wiring locations.
Fit all cables/wires through the Pg cable entries and gaskets
(NEMA4).
The maximum back-up fuse is stated on the control panel
nameplate.
If required according to local regulations, install an external
disconnect switch.
6.4 System for one pump (SLC) and submersible level
transducer, and two optional backup float
switches
Read all the warnings listed in section 4. Installing the product
before you begin any work.
The pump is controlled by the liquid level in the pit. For wiring
diagrams, see section 4.3 Electrical connection.
For functional information, see section 9.7.2 SLC, transducer-
controlled option.
Fig. 15 One-pump system (SLC) with submersible level
transducer and two optional backup float switches
6.4.1 Electrical connection
For all field connections to the panel, i.e. main power connection,
pump power connections, submersible pressure transducer,
optional high/low float-switch backup, pump overtemperature
sensor, seal failure sensor, dry alarm contacts, see wiring
diagram, fig. 6, for terminal wiring locations.
Fit all cables/wires through the Pg cable entries and gaskets
(NEMA4X).
The maximum back-up fuse is stated on the control panel
nameplate.
If required according to local regulations, install an external
disconnect switch.
The use of backup float switches is optional.
TM05 6688 5012
2
3
1
The use of backup float switches is optional.
TM06 7165 2916
2
1

English (US)
16
6.5 System for two-pump (DLC) operation with four
float switches
Read all warnings listed in section 4.3 Electrical connection
before you begin any work.
The pump is controlled by the liquid level in the pit. For wiring
diagrams, see section 4.3 Electrical connection.
For functional information, see section 9.7.3 DLC, float-switch-
controlled option.
Fig. 16 Two-pump system (DLC) with four float switches
6.5.1 Electrical connection
For all field connections to the panel, i.e. main power connection,
pump power connection, float switches, pump overtemperature
sensor, seal failure sensor, dry alarm contacts, see wiring
diagram, fig. 7, for terminal wiring locations.
Fit all cables/wires through the Pg cable entries and gaskets
(NEMA4X).
The maximum amperage is stated on the control panel
nameplate.
If required according to local regulations, install an external
disconnect switch.
6.6 System for two-pump operation (DLC) with
submersible level transducer and two backup float
switches
Read all warnings listed in section 4.3 Electrical connection
before you begin any work.
The pump is controlled by the liquid level in the pit. For wiring
diagrams, see section 4.3 Electrical connection.
For functional information, see section 9.7.4 DLC, transducer-
controlled option.
Fig. 17 Two-pump system (DLC) with submersible level
transducer and optional two backup float switches
6.6.1 Electrical connection
For all field connections to the panel, i.e. main power connection,
pump power connections, submersible pressure transducer,
optional high/low level float-switch backup, pump
overtemperature sensor, seal failure sensor, dry alarm contacts,
see wiring diagram, fig. 8, for terminal wiring locations.
Fit all cables/wires through the Pg cable entries and gaskets
(NEMA4X).
The maximum amperage is stated on the control panel
nameplate.
If required according to local regulations, install an external
disconnect switch.
The use of backup float switches is optional.
TM05 6689 5012
4
The use of backup float switches is optional.
TM06 7211 2916

17
English (US)
7. Product introduction
7.1 Identification
7.1.1 Nameplate
How to read the model designation
The actual control panel type, voltage variant, etc. are stated on
the nameplate inside the control panel.
SLC nameplate
Fig. 18 Example of SLC nameplate
The SLC is available for direct-on-line starting.
The SLC can be connected and set to operate with either two or
three float switches. See these sections:
•6.3 System for one pump (SLC) and three float switches.
•6.4 System for one pump (SLC) and submersible level
transducer, and two optional backup float switches.
DLC nameplate
Fig. 19 Example of DLC nameplate
The DLC is available for direct-on-line starting.
The DLC can be connected and set to operate in two different
ways. See these sections:
•6.5 System for two-pump (DLC) operation with four float
switches.
•6.6 System for two-pump operation (DLC) with submersible
level transducer and two backup float switches.
For panel model ZGPCS230-3
Z = Electrical equipment
G = Grundfos
PC = Pump control panel
S
D= Simplex Duplex
230-3 = 230 V, 3-phase
TM06 1918 4116TM06 1918 4116

English (US)
18
7.2 Type key
7.3 Approvals
Listed per UL 508A.
Example Control SLC . 208/230 . A . 1 . B . 30/150 . T . FC
Type range
Control SLC: Simplex Control panel
Control DLC: Duplex Control panel
Voltage [V]
208/230 V
460 V
575 V
Motor power [hp]
208-230 V
A: 1.5 - 1.8 hp
B: 2 - 7.5 hp
C: 8-10 hp
D: 12.5 - 15 hp
460 V
E: 1.5 - 4 hp
F: 5.5 - 10 hp
D: 12.5 - 15 hp
575 V
G: 1.5 hp
H: 1.8 - 3 hp
I: 4 - 5.5 hp
J: 7.5 hp
C: 8-10 hp
D: 12.5 - 15 hp
Phase
1: Single-phase
3: Three-phase
Operating current [A]
208/230 V - 460 V
A: 2 - 6.3 A
B: 5.7 - 18.9 A
C: 9-30 A
D: 15-45 A
575 V
E: 1.6 - 2.5 A
F: 2.5 - 4 A
G: 4 - 6.3 A
H: 6-10 A
I: 9-14 A
J: 13-18 A
Run/start capacitor
(blank = no capacitor)
Options
T: Battery backup
Y: Intrinsically safe with UL698A listing
Z: Padlockable main disconnect switch
Level detection
FC: Float-switch-controlled
PT: Analog submersible pressure transducer-controlled

19
English (US)
8. Product range
8.1 SLC, float-switch-controlled option
8.2 SLC, transducer-controlled option
Description Phase Voltage
[VAC]
Motor shaft
power
[hp]
Overload range
[A]
Main disconnect
switch required
[A]
Product
number
SLC.208/230.B.1-FC 1 208/230 2.0 10.0 - 40.0 15 99165671
SLC.208/230.A.3.A-FC 3 208/230 1.5 - 1.8 2.0 - 6.3 15 99107775
SLC.208/230.B.3.B-FC 3 208/230 2.0 - 3.0 5.7 - 18.9 15 99107776
SLC.208/230.B.3.C-FC 3 208/230 2.0 - 7.5 9.0 - 30 30 99107777
SLC.208/230.C.3.D-FC 3 208/230 8.0 - 10.0 15.0 - 45.0 40 99107778
SLC.208/230.D.3.D-FC 3 208/230 12.5 - 15.0 15.0 - 45.0 60 99107779
SLC.460.E.3.A-FC 3 460 1.5 - 4.0 2.0 - 6.3 15 99107780
SLC.460.F.3.B-FC 3 460 5.5 - 10.0 5.7 - 18.9 20 99107781
SLC.460.D.3.C-FC 3 460 12.5 - 15.0 9.0 - 30.0 25 99107782
SLC.575.G.3.E-FC 3 575 1.5 1.6 - 2.5 15 99153139
SLC.575.H.3.F-FC 3 575 1.8 - 3.0 2.5 - 4.0 15 99153140
SLC.575.I.3.G-FC 3 575 4.0 - 5.5 4.0 - 6.3 15 99153141
SLC.575.J.3.H-FC 3 575 7.5 6.0 - 10.0 20 99153142
SLC.575.C.3.I-FC 3 575 8.0 - 10.0 9.0 - 14.0 20 99153143
SLC.575.D.3.J-FC 3 575 12.5 - 15.0 13.0 - 18.0 25 99153144
Description Phase Voltage
[VAC]
Motor shaft
power
[hp]
Overload range
[A]
Main disconnect
switch required
[A]
Product
number
SLC.208/230.B.1-PT 1 208/230 2.0 10.0 - 40.0 15 99165673
SLC.208/230.A.3.A-PT 3 208/230 1.5 - 1.8 2.0 - 6.3 15 99107059
SLC.208/230.B.3.B-PT 3 208/230 2.0 - 3.0 5.7 - 18.9 15 99107060
SLC.208/230.B.3.C-PT 3 208/230 2.0 - 7.5 9.0 - 30.0 30 99107061
SLC.208/230.C.3.D-PT 3 208/230 8.0 - 10.0 15.0 - 45.0 40 99107062
SLC.208/230.D.3.D-PT 3 208/230 12.5 - 15.0 15.0 - 45.0 60 99107063
SLC.460.E.3.A-PT 3 460 1.5 - 4.0 2.0 - 6.3 15 99107064
SLC.460.F.3.B-PT 3 460 5.5 - 10.0 5.7 - 18.9 20 99107065
SLC.460.D.3.C-PT 3 460 12.5 - 15.0 9.0 - 30.0 25 99107066
SLC.575.G.3.E-PT 3 575 1.5 1.6 - 2.5 15 99153151
SLC.575.H.3.F-PT 3 575 1.8 - 3.0 2.5 - 4.0 15 99153152
SLC.575.I.3.G-PT 3 575 4.0 - 5.5 4.0 - 6.3 15 99153153
SLC.575.J.3.H-PT 3 575 7.5 6.0 - 10.0 20 99153154
SLC.575.C.3.I-PT 3 575 8.0 - 10.0 9.0 - 14.0 20 99153155
SLC.575.D.3.J-PT 3 575 12.5 - 15.0 13.0 - 18.0 25 99153156

English (US)
20
8.3 DLC, float-switch-controlled option
8.4 DLC, transducer-controlled option
8.5 Additional options
**Enclosure adder is required
Note: Seal-failure sensor(s), overtemperature sensor(s) are standard. Condition messages, such as run time, alarms and pump
cycles are displayed on the HMI operating panel.
Description Phase Voltage
[VAC]
Motor shaft
power
[hp]
Overload range
[A]
Main disconnect
switch required
[A]
Product
number
DLC.208/230.B.1-FC 1 208/230 2.0 10.0 - 40.0 25 99165672
DLC.208/230.A.3.A-FC 3 208/230 1.5 - 1.8 2.0 - 6.3 20 99107783
DLC.208/230.B.3.B-FC 3 208/230 2.0 - 3.0 5.7 - 18.9 20 99107784
DLC.208/230.B.3.C-FC 3 208/230 2.0 - 7.5 9.0 - 30.0 50 99107785
DLC.208/230.C.3.D-FC 3 208/230 8.0 - 10.0 15.0 - 45.0 75 99107786
DLC.208/230.D.3.D-FC 3 208/230 12.5 - 15.0 15.0 - 45.0 120 99107787
DLC.460.E.3.A-FC 3 460 1.5 - 4.0 2.0 - 6.3 20 99107788
DLC.460.F.3.B-FC 3 460 5.5 - 10.0 5.7 - 18.9 40 99107789
DLC.460.D.3.C-FC 3 460 12.5 - 15.0 9.0 - 30.0 50 99107790
DLC.575.G.3.E-FC 3 575 1.5 1.6 - 2.5 15 99153145
DLC.575.H.3.F-FC 3 575 1.8 - 3.0 2.5 - 4.0 15 99153146
DLC.575.I.3.G-FC 3 575 4.0 - 5.5 4.0 - 6.3 20 99153147
DLC.575.J.3.H-FC 3 575 7.5 6.0 - 10.0 25 99153148
DLC.575.C.3.I-FC 3 575 8.0 - 10.0 9.0 - 14.0 30 99153149
DLC.575.D.3.J-FC 3 575 12.5 - 15.0 13.0 - 18.0 40 99153150
Description Phase Voltage
[VAC]
Motor shaft
power
[hp]
Overload range
[A]
Main disconnect
switch required
[A]
Product
number
DLC.208/230.B.1-PT 1 208/230 2.0 10.0 - 40.0 25 99165674
DLC.208/230.A.3.A-PT 3 208/230 1.5 - 1.8 2.0 - 6.3 20 99107067
DLC.208/230.B.3.B-PT 3 208/230 2.0 - 3.0 5.7 - 18.9 20 99107068
DLC.208/230.B.3.C-PT 3 208/230 2.0 - 7.5 9.0 - 30.0 50 99107069
DLC.208/230.C.3.D-PT 3 208/230 8.0 - 10.0 15.0 - 45.0 75 99107070
DLC.208/230.D.3.D-PT 3 208/230 12.5 - 15.0 15.0 - 45.0 120 99107071
DLC.460.E.3.A-PT 3 460 1.5 - 4.0 2.0 - 6.3 20 99107072
DLC.460.F.3.B-PT 3 460 5.5 - 10.0 5.7 - 18.9 40 99107073
DLC.460.D.3.C-PT 3 460 12.5 - 15.0 9.0 - 30.0 50 99107074
DLC.575.G.3.E-PT 3 575 1.5 1.6 - 2.5 15 99153157
DLC.575.H.3.F-PT 3 575 1.8 - 3.0 2.5 - 4.0 15 99153158
DLC.575.I.3.G-PT 3 575 4.0 - 5.5 4.0 - 6.3 20 99153159
DLC.575.J.3.H-PT 3 575 7.5 6.0 - 10.0 25 99153160
DLC.575.C.3.I-PT 3 575 8.0 - 10.0 9.0 - 14.0 30 99153161
DLC.575.D.3.J-PT 3 575 12.5 - 15.0 13.0 - 18.0 40 99153162
SLC and DLC Product number
**Battery backup with charger (for alarm only)
Consult factory
**Intrinsically safe relay for float inputs with UL698A Listing (FC only)
**Intrinsically safe barrier/relay for pressure transducer and backup floats, UL698A (PT only)
Padlockable main disconnect switch
Phase monitor with fusing
304 Stainless steel panel
Enclosure adder