1 – 6
Getting Started
[
],
OPEN
, or
CLOSED
will cause the SR470 to attempt to enable the
shutter head and move it to the open or closed position as requested.
If the head powers on successfully, the SR470 will display its state
with either the
OPEN
or
CLOSED
indicator. If the shutter head
instead encounters a fault, the SR470 will remove power to the shutter
head and illuminate the
FAULT
indicator. Again, this fault condition
can be cleared by pressing the [
] (reset) key.
The shutter “logic” power supply (at
+
4.5 VDC) is always provided
to a connected shutter when the SR470 is powered on, regardless
of the operational state of the shutter head. This provides power
for diagnostics and serial communications. It is separate from the
+
12 VDC power supply that drives the motor (coil) in an attached
shutter head. When the shutter is said to be powered down (e.g.,
in
sleep
mode), it is the
+
12 VDC power supply that is disconnected
from the shutter head. Because power is not available to change the
position of the shutter blade, the blade position is therefore indeter-
minate.
1.2.2.5 Shutter faults and alarms
The SR470 is equipped with audible and electronic alarms that are
asserted whenever the front-panel
FAULT
indicator is lit.
The audible alarm is a continuously emitted, loud siren-like noise.
It can be enabled or muted by pressing the [Alarm] in the “Utility”
section of the front panel; see
§
1.2.5.1.
The electronic alarm is a rear-panel
Alarm
output (
§
1.3.7) that is also
asserted (pulled low) whenever the
FAULT
indicator is lit. This is a
fixed output and cannot be disabled.
The alarm functions are intended to help draw attention to fault
conditions that might otherwise be di
ffi
cult to detect. For example,
if an enabled shutter head is disconnected, that event will generate
a fault. The expected configuration of the SR470 is saved in non-
volatile memory such that if a shutter head is accidentally discon-
nected during a power outage, a fault will be declared in that channel
when power is restored, and cannot be cleared by merely cycling the
power. Operator action is required to clear a fault condition.
As discussed in
§
1.2.2.3, a shutter fault can be cleared by pressing
the [
] (reset) key.
Before
the fault is cleared, it is possible to display
the error word for the shutter by pressing [Shift] [Err Code]. This
alternate function is located is above the [Cancel] key in the “Modify”
section of the front panel. Please see the manual for your shutter head
for the meanings of possible error codes. See also
§
2.6 for more about
the error codes on the SR470 .
SR470 Shutter Controller
