SSM-LE Series
Operations Manual
Eberle Design Inc.
Page 5
A voltage greater than the +24V Monitor input threshold (Section 7.1.4) applied to both of
the +24V MONITOR inputs will be sensed by the SSM-LE Series
as adequate for operation
of the cabinet assembly. A voltage less than the +24V Monitor input threshold applied to
either of the +24V MONITOR inputs will be sensed as inadequate for proper operation.
When a +24V MONITOR input is sensed as inadequate for more than the +24V Monitor
Fault time (7.4), the SSM-LE Series
will enter the fault mode and transfer the OUTPUT
relay contacts to the Fault position. When a +24V MONITOR input is sensed as inadequate
for less than the +24V Monitor No-Fault time, the SSM-LE Series
will not transfer the
OUTPUT relay contacts to the Fault position. A +24Vdc failure during the programmed
Minimum Flash time or during a Power Failure will not cause a fault condition.
2.3.1.1 +24VDC MONITOR INHIBIT INPUT
A +24V MONITOR INHIBIT input is provided to inhibit the operation of the +24Vdc Monitor.
Application of a logic TRUE (low) state to this input will disable the operation of the +24Vdc
Monitor.
2.3.1.2 +24VDC MONITOR LATCH INPUT
An Option Switch is supplied on the front panel to allow +24Vdc failures to latch in the fault
condition until the unit is reset by the activation of the RESET button or the EXTERNAL
RESET input. See Section 5.4.5. A +24Vdc failure during the programmed Minimum Flash
time or during a Power Failure will not cause a latched fault condition.
2.3.2 CONTROLLER VOLTAGE / FAULT MONITOR INPUT
This input is to be connected to the CONTROLLER UNIT VOLTAGE MONITOR (CVM)
output from the Controller Unit. When the TRUE (low) state is absent for more than the
CVM Fault time (7.4), the SSM-LE Series
will enter the fault mode, transfer the OUTPUT
relay contacts to the Fault position, and display the CVM status screen. When the TRUE
(low) state is absent for less than the CVM No-Fault time, the SSM-LE Series
will not
transfer the OUTPUT relay contacts to the Fault position. The SSM-LE Series
will
automatically reset the OUTPUT relay when the True (low) state is restored to the input.
The SSM-LE Series
will remain in the fault mode for at least the time determined by the
Minimum Flash programming. A CVM failure during the programmed Minimum Flash time
or during a Power Failure will not cause a fault condition.
2.3.2.1 CVM MONITOR LATCH INPUT
An Option Switch is supplied on the front panel to allow CVM failures to latch in the fault
condition until the unit is reset by the activation of the RESET button or the EXTERNAL
RESET input. See Section 5.4.5. A CVM failure during the programmed Minimum Flash
time or during a Power Failure will not cause a latched fault condition.
2.3.2.2 CVM LOG DISABLE
If CVM events are not related to a malfunction condition and occur on a regular basis such
as Time of Day flash, the logging of these events can be disabled. See Section 5.4.7.
2.4 POWER FAILURE DETECTION
When the AC LINE voltage is below the minimum AC Line drop-out level (Section 7.1.2) for
the Power Fail Respond time (7.4), the SSM-LE Series
will suspend all fault monitoring
functions, de-energize the OUTPUT relay, and de-energize the START relay. The POWER
indicator on the front panel will flash at a rate of 2Hz to indicate the low voltage status.
When the AC LINE voltage returns above the maximum AC Line restore level (Section
7.1.2) for the Power Fail Restore time (7.4), the monitor will resume normal operation and
the POWER indicator on the front panel will remain illuminated. After a 2.5 +
_0.5 second
delay the START relay will be energized. After a programmable delay determined by the
Minimum Flash programming (see Section 5.2), the OUTPUT relay will be energized.
