Red Lion GEMINI 2 - Manual (Page 36)

PRIMARY A.C. POWER WIRING
For best results, the A.C. primary power should be relatively “clean” and within
the specified +/-10% variation limits. Drawing power from heavily loaded circuits
or from circuits that also power loads that cycle on and off, should be avoided.
TheACpowerisconnectedtothebottomleftterminalsTBA1&2,markedasAC
Power, 50/60 Hz. The voltage selector switch, located on the side of the unit, is used
to select the proper voltage. The switch is a slide movement type and can be set by
using a small screwdriver. If the switch is towards the front of the unit, it is set for 230
VACinput.Theswitchisinthe230VACpositionwhenshippedfromthefactory.
Note: Before applying power to the unit, make sure the AC power selector switch
is set for the proper voltage setting.
USING AN EXTERNAL POWER SOURCE
The Gemini can be operated from a D.C. power source that provides 11-14
VDC at the units rated power consumption. The power source can be a 12 V
battery or an external power supply that is capable of supplying the unit’s rated
current. It is not necessary to provide battery backup to retain count information.
The Gemini has an internal memory in which the count is stored upon
power-down. Refer to the “Block Diagrams”.
Relay Wiring
To prolong contact life and suppress electrical noise interference due to the
switching of inductive loads, it is good installation practice to install a snubber
across the contactor. Follow the manufacturer’s instructions for installation.
Note: Snubber leakage current can cause some electro-mechanical devices to be
held ON.
SERIAL COMMUNICATIONS
The Gemini 2000 can be purchased with 20 mA Current Loop Option. On
these units, refer to the 20 mA Current Loop section for installation and
operational procedures of the Serial loop.
INPUT A & MAGNETIC PICKUP INPUT
The Magnetic Pickup Input and Input A utilize some common circuitry. For
this reason the Input A switches are used to set up both Magnetic Pickup and
Logic Input A. S1 selects between Magnetic Pickup Input or Logic Input A.
WHEN THE MAGNETIC PICKUP INPUT IS BEING USED, S2 MUST BE IN
THE SNK POSITION or the unit will not count.
S3 (HI/LO FRQ) and S4 (HI/LO BIAS) do not affect the Magnetic Pickup
Input. When S1 is in the Logic position, the Magnetic Pickup Input is disabled
and Input A can be used.
INPUT B
Input B is designed specifically for Logic type inputs. It is identical to the
count input of SC Series counters. When Input A is set up for Logic operation,
both Input A and Input B operate identically. S5, S6, and S7 function the same as
S2, S3, and S4.
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