QS System
STEP-PS24DC/3.8-CPN5550
QS Link Power Supply
369336 Rev. C 1 11.06.13
QS Link Power Supply
The STEP-PS QS link power supply provides up to
22 Power Draw Units (PDUs) on a QS link. The
STEP-PS powers additional compatible accessories
and devices, allowing them to be added to a
QS system.
Specifications
Input Power
•Nominal input voltage: 100–240 V
•Frequency: 50/60 Hz
•Current consumption, fully loaded:
approx. 0.8 A (230 V )
approx. 1.3 A (120 V )
Power Supply Output
•Nominal output voltage and tolerance:
24 V / ±1%, 22 Power Draw Units*
•Setting range of output voltage: 22.5–25.0 V ;
at time of shipment, the output voltage is 24 V
* Power supply is rated to provide a maximum of
22 Power Draw Units to devices on the QS Link.
Use above this maximum will reduce the lifetime of
the supply and void all Lutron® warranties.
Note: This power supply is NOT rated for use with
motorized shades/window treatments.
Environment
•Ambient temperature operation: -25 to +70 °C
(-13 to +158 °F)
(> 55 °C / 131 °F Derating 2.5% / K or 3.5% / F)
•Ambient temperature storage: -40 to +85 °C
(-40 to +185 °F)
•Humidity at +25 °C (77 °F), no condensation: ≤ 95%
®
Job Name:
Job Number:
S P E C I F I C AT I O N S U B M I T TA L
Model Numbers:
STEP-PS24DC/3.8-CPN5550
(STEP-PS/1AC/24DC/3.8/C2LPS-CPN5550)
Standards
•Electrical Safety: IEC60950 / VDE 0805, UL/cUL
Recognized UL 60950
•Safety Transformer: EN61558-2-17
•Electronic equipment for electrical power installations:
EN 50178 / VDE 0106-101
•Safe isolation: DIN VDE 0100-410 / DIN VDE 0106-101
•Industrial regulating devices: UL/cUL Listed UL 508
•Shipbuilding: GL
•Limitation of main harmonic currents: EN 61000-3-2
•Electromagnetic compatibility CE in conformance with
EMC Guidelines: 2004/108/EG ; 2006/95/EG.
- Immunity to interference: EN 61000-6-2
- Noise emission: EN 61000-6-3
•Protection Class II
•UL Approvals:
- UL/cUL Listed UL 508
- NEC® Class 2 as per UL 1310
- UL/cUL Listed ANSI/ISA-12.12.01 Class I, Division 2,
Groups A, B, C, D
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en_02
QS System
STEP-PS24DC/3.8-CPN5550
QS Link Power Supply
369336 Rev. C 2 11.06.13
Dimensions
Dimensions shown as: mm (in)
90
(3.5)
30
(1.18)
55 (2.17)
44
(1.73)
150
(5.9)
100-240V
100-240V
24V 3.8 A
24V 3.8 A
90
(3.5)
22.5-25.0 V
22.5-25.0 V
50
(1.97)
30 (1.18)
Required clearance above and below
the power supply.
61 (2.4)
Mounting
•Surface mount using screws, or mount on DIN rail
•Use an IP20 (minimum) rated consumer panel or
breaker panel with integrated DIN
®
Job Name:
DIN Rail Mounting:
Surface Mounting:
Snap onto DIN rail.
To remove, pull out tabs with
screwdrivers and lift off.
Pull out tabs with
screwdrivers.
Screw through tabs to secure.
S P E C I F I C AT I O N S U B M I T TA L
Model Numbers:
Page
2
Job Number:
PHOENIX CONTACT
PHOENIX CONTACT
8
8
QS System
STEP-PS24DC/3.8-CPN5550
QS Link Power Supply
369336 Rev. C 3 11.06.13
Wiring
•Wire product in accordance with national and local
electrical codes
•Each terminal takes one 0.2 to 2.5 mm2
(24 to 12 AWG) wire, with 6.5 mm (1/4 in) stripped bare
•Maximum torque: 0.6 to 0.8 N∙m (5.0 to 7.0 in∙lb)
Hot/live (L) and neutral (N)
in from distribution panel
L
+
+
N
-
+ 24 V out to terminal 2 of QS devices on the link. Do
not connect to terminal 2 of other power sources on the
link (see Link Power Distribution diagram)
- Common out to terminal 1 of all QS devices on the link,
including other power sources
24V 3.8 A
100-240V
22.5-25.0 V
®
Job Name:
Job Number:
S P E C I F I C AT I O N S U B M I T TA L
Model Numbers:
Page
3
QS System
STEP-PS24DC/3.8-CPN5550
QS Link Power Supply
369336 Rev. C 4 11.06.13
QS Link Power Distribution
On the QS link, there are devices that supply power and devices that consume power. Each device has a specific
number of Power Draw Units (PDUs) it either supplies or consumes. A Power Group consists of one device that
supplies power and one or more devices that consume power; each Power Group may have only one
power‑supplying device.
Within Power Groups on the QS link, connect all 4 terminals (1, 2, 3, and 4), shown by the letter A in the diagram.
Between devices on the QS link that supply power, connect only terminals 1, 3, and 4 (NOT terminal 2), shown by
the letter B on the diagram. See Wiring section on the previous page for details on wiring the STEP-PS power
supply to the QS link.
erminals 1, 2, 3, and 4 connect devices
A T
within a power group.
Example: Power Group Wiring
A
Terminals 1, 3, and 4 connect between
B Power Groups. Terminal 2 is NOT
connected between Power Groups.
LUTRON
GRAFIK Eye®
QS
QSE-CI-NWK-E
B
Power Group 1
seeTouch® QS
keypad
Power Group 2
A
Energi Savr
NodeTM QS
seeTouch® QS
keypad
B
seeTouch® QS
keypad
seeTouch® QS
keypad
Power Group 3
A
STEP-PS
power supply
QSE-IO
seeTouch® QS seeTouch® QS
keypad
keypad
1 3 4
−
STEPPS
+
®
Job Name:
Job Number:
1
2
3
4
Power
consuming
device
1
2
3
4
S P E C I F I C AT I O N S U B M I T TA L
Model Numbers:
QS sensor module
and occupancy
sensor
STEP-PS Power Supply Power Group Wiring Detail
Between power supplying devices:
Connect only terminal 1 (common; “−” terminal on the
STEP-PS). See previous page.
Between Power Group 3 devices and STEP-PS:
Connect terminals 1 (common) and 2 (power).
Between the QS link and devices powered by the
STEP-PS:
Connect terminals 3 and 4 (communication/data).
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