Quadlogic MiniCloset-5c, Руководство по установке, Страница: 89 / 117

Appendix
© COPYRIGHT 2009
Quadlogic Controls Corporation
85
T
HE
P
ULSE
D
ATALOGGER
M
ODULE
The MiniCloset-5c can use Pulse Datalogger Modules (PDM) to collect pulses from other
utility meters (water, gas, BTU, etc.) that have optional Form-A dry-contact pulse outputs.
Each PDM, which is powered by the MC-5c, can accommodate 12 discrete meters. Four (4)
PDMs can be daisy-chained together to create a total of 48 discrete inputs.
Note: The MC-5c needs to be configured to accept pulses for it to start collecting the pulse
outputs from the other utility meters.
The PDMs need to be connected to the MC-5c via a CAT-5 cable. The MC-5c-to-PDM chain
can run up to 300 feet. Once connected, the MC-5c will initialize the PDMs to start reading
the pulses coming out of the other utility meters. A PDM can count pulses even during a
power outage as long as it has already been initialized by the MC-5c. The pulses can be
logged in programmable intervals, i.e. 5-, 15-, 30-, and 60-minute intervals.
The pulses that are counted by the PDM consist of a 'closed' state on the external contact,
followed by an 'open' state. In order to be reliably registered, the time that the contact is
'open' must be at least the Min Pulse Width, and the time that the contact is 'closed' must
also be at least the Min Pulse Width.
Interrogating Signal Min. Pulse Width:
Specifications: Power on - 50 msec.
Power off - 500 msec.*
Max. Pulse Rate:
Power on - 10 pulses/sec max
Power off - 1 pulse/sec max
Peak voltage: 5.5V
Peak current: not applicable
Isolation: The interrogating signal is completely
isolated from the AC line, with isolation barriers rated for at
least 2.5 KV.
Max. signal debounce tolerance: 20msec.
* When the MC-5c loses power or is disconnected from the PDM, the PDM has the capability
to record pulses using its onboard battery for power. In this situation, the sample rate of the
PDM is reduced to decrease current drain and extend battery life.