WHAT'S THE DIFFERENCE BETWEEN THE TWO VERSIONS?
The Dual-Channel version has two separate channels; the Single-Channel
version has just one channel. The electrical and physical
specifications for both versions are otherwise identical - However, the
Single-Channel version lacks a relay "Strapping" feature.
ON THE DUAL-CHANNEL VERSION, ARE THE 2 CHANNELS INDEPENDENT OF
EACH OTHER? Yes, each channel can be assigned to functions
entirely unrelated to the other. However, both channels share a common
analog ground pin (Terminal C),
which means that the ground connections for both devices being
monitored must be capable of being connected together (e.g., a
difference in voltage can not exist between them).
WHEN
A LED IS ILLUMINATED, WHAT IS IT INDICATING? It indicates
that the switch for that channel has turned "on", closing the relay's
NO contact and opening the NC contact. (NOTE: Since the relay coils are only
energized for a small fraction of a second as the contacts move to
their new position, the LED does not indicate that the relay coils
are energized).
WHEN
THE INDICATOR LEDS ARE ILLUMINATED, DO THEY INCREASE THE UNIT'S CURRENT
CONSUMPTION? Yes, but only by approximately 0.25 mA each.
Consequently, they don't add any significant amount to the unit's
overall power consumption.
WHY
MUST THE PUSHBUTTONS BE HELD DOWN FOR 2 SECONDS BEFORE THE UNIT
RESPONDS? This time delay feature is designed to prevent
any chance of accidentally changing the settings by momentarily bumping
the buttons.
ARE
THE RELAY CONTACTS COMPLETELY ISOLATED FROM THE UNIT'S OTHER
CONNECTIONS? Yes, the contacts are not internally
connected to the rest of the circuit, and are rated to provide 5 KV of
electrical isolation from it. Consequently, the contacts can be safely
used to control equipment powered from AC mains.
WHEN THE
RELAY-STRAPPING FUNCTION IS ENABLED, CAN THE CONTACTS FOR BOTH RELAYS
BE CONNECTED TOGETHER IN PARALLEL FOR MORE CURRENT-CARRYING ABILITY? This is NOT
recommended. Both relays do not operate at the exact same instant -
which means
that one of them would be carrying the entire circuit's currrent until
the other one operated, shortening its lifespan. The purpose of the
Strapping function is to control two separate circuits (i.e., separate
AC mains and low-voltage DC circuits) - not to increase the total
current-carrying capacity of the unit.
WHAT'S THE LARGEST/SMALLEST WIRE SIZE THAT THE TERMINALS WILL ACCEPT? The relay terminals will accept 12 to 28 gauge wire. The input terminal will accept 16 to 22 gauge wire.
CAN
THE UNIT ACT ON NEGATIVE INPUT VOLTAGES? No, any input
voltages must be positive with respect to the Analog Ground pin
(Terminal C) and POWER [-] pin (Terminal G).
CAN
THE UNIT ACT ON AC INPUT VOLTAGES? No, the unit only
accepts DC input voltages. Consequently, any AC voltages must first be
rectified and filtered before they can be monitored by the unit.
CAN
THE 5VDC REFERENCE OUTPUT TERMINAL BE USED TO POWER OTHER DEVICES?
Yes, as long as the total current consumption does not exceed 50 mA.
Note that connecting these devices may change the unit's internal
reference voltage somewhat, possibly requiring the entry of new Von or
Voff settings after the device is connected. The device's negative DC
power connection should be made to the POWER [-] pin
(Terminal G).
IS
THE UNIT WATERPROOF? The unit is best characterized as "water-resistant" - The switches are waterproof, and the entire unit (except
for connectors, LEDs and switches) is encapsulated in epoxy. The unit is NOT tested to any
standards for immersion or water entry.
WHAT TOOLS WILL I NEED TO INSTALL
IT? A #2 Phillips screwdriver for mounting the
unit, a
drill and 1/8" drill bit for the mounting holes, and
a very small 3/32" slotted screwdriver to tighten wire connections on
the center terminal block.
HOW
DO I OBTAIN A COPY OF THE INSTALLATION OR OPERATING INSTRUCTIONS?
Click HERE
to download the Owner's Manual, which includes both the installation
and operating instructions.
(This page was last modified 2/04/2012)
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