Green Light Power Switching
Crestron Commercial Lighting Design Guide
Green Light Express
Feed-Through Power Switching Panels w/Zero-Cross
The GLPS-HSW-FT panels utilize Crestron zero-cross
arcless relay technology, achieving a relay lifetime of one
million cycles. A high-current triac is employed to handle
the high inrush current turn on, especially with certain
load types such as HID and electronic ballasts. Within
milliseconds, the continuous load is transferred to a
robust 50A mechanically-latching relay. All switching
occurs at the zero-cross point of the AC waveform under
microprocessor control. This is a complete solution,
eliminating arcing at the physical relay contacts
and turn off, and supports switching of all types of
up to 16A at 100V to 277V, as well as
motors up to 1 HP.
As an option, GLPS-HSW-FT panels may be equipped with 0-
10V fluorescent dimming control substituted in place of some
or all switching circuits. Consult Crestron Sales Support
Services to specify this option.
The GLPS-HSW-FT panels employ field-replaceable lighting
control modules, with 8 or 12 control circuits per module,
for excellent configurability and serviceability. Each module
includes local relay controls and load state indicators for each
circuit, plus additional controls and indicators for use during
As part of a complete Green Light system, GLPS-HSW-FT
panels connect to an IPAC-GL1 lighting control processor
(or other 2-Series Control System) via the Cresnet control
network. An optional GLA-PWS50 (or equivalent) power
supply is also recommended for each panel to provide
backup power to the lighting modules.
Remote emergency override mode allows the lighting system
program to be overridden while each circuit is set to an
override preset state. The override preset for each circuit is
set using the local controls on the front of each lighting
module. Remote override mode is activated by an external
contact closure from a Crestron GLS-PLS-120/277 power
loss sensor or other devices
All low-voltage connections to a GLPS-HSW-FT panel are
made via a connector block located near the bottom of the
panel. Connections are provided for Cresnet communications,
backup power supply, and emergency override.
Crestron Green Light Express Power Switching panels are
configured to order, and factory assembled and tested prior
to shipping. Each panel is engineered to provide a clean and
manageable installation with abundant provisions for wire
termination and conduit knockouts. On-site installation is fast
and easy with all termination points clearly labeled and
accessible from the front.
Specifying and ordering a Crestron Green Light Express
Power Switching panel is facilitated using the following
model number system. Simply
fill in the appropriate entry in each position according to the
steps that follow:
GLPS - HSW - FT - 32
Number of Ckts.
The above example is for a
panel with 32
zero-cross arcless relays.
Relay Type: Enter
to specify zero-cross arcless
Notes: For other relay types, refer to the Selection Guide
0-10V fluorescent dimming is also available. Consult Crestron
Sales Support Services to specify this option.
Feed Type: Enter
Note: For other feed types, refer to the Selection Guide
Number of Circuits: Choose one of the following numeric
values to specify the number of controlled circuits in the
Small: 8, 12, 16
Large: 20, 24, 28, 32
refer to the default panel size
per number of circuits. Consult Crestron Sales Support
Services for alternate configurations.