BAM 1020-9800 Manual Rev W.docx
Page 76
Standard Mode Clock Resets:
Minute 0 to 5:
An external reset signal will change the BAM clock back to the 00:00 of
the current hour. If a cycle has already started, it will continue. No error
occurs since there is adequate time to complete the cycle.
Minute 5 to 55:
An external reset signal has no effect. The error log will contain the date
and time of the
“E” alarm reset attempt.
Minute 55 to 60:
If an external reset occurs after a completed cycle (idle condition), then
no error occurs. The clock will be set forward to 00:00 of the next hour
and a new measurement cycle will start.
EARLY Mode Clock Resets:
Minute 55 to 60:
The external reset signal changes the clock back to minute 55:00 of the
current hour. A new measurement cycle will start at that moment. If a
cycle has already started, it will continue. No error occurs since there is
adequate time to complete the cycle.
Minute 0 to 50:
The external reset signal has no effect. The error log will contain the date
and time of the
“E” alarm reset attempt.
Minute 50 to 55:
If an external reset occurs after a completed cycle (idle condition), then
no error occurs. The clock will be set forward to minute 55:00 of the
current hour and a new measurement cycle will start.
8.3 Telemetry and Error Relays
In addition to the analog output voltage, several input and output relay connections are
provided on rear panel of the BAM 1020. These can be connected to an external data logger
as a second method of indicating alarms between the BAM and the logger, but in practice
most of these relay telemetry connections are rarely used. The function of each input and
output is described below.
Note:
A
contact-closure input
to the BAM 1020 is achieved by shorting the two terminals on
that particular input together, usually with a relay on the external data logger. The data logger
should not apply any voltage to the terminals.
Contact-closure outputs
from the BAM 1020
are provided by the BAM 1020 shorting the two terminals together with an internal relay,
without applying any voltage or current to them. The external data logger must then sense
the closure. The contacts are rated at 100VDC, 0.5A max.
Normally-Open
means that the
relay contacts are not shorted together unless a certain condition occurs, while
Normally-
Closed
means that the relay contacts are shorted until the condition occurs, then they open.
