Red Lion GEMINI 33 - Manual (Page 31)

AC POWER WIRING
For best results, the A.C. 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.
The AC power is connected to the bottom left terminals TBA 1 & 2 marked
AC PWR. The voltage selector switch, located at 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 toward the rear of the unit, it is set for
115 VAC input. If the switch is towards the front of the unit, it is set for 230 VAC
input. The switch is in the 230 VAC position when shipped from the factory.
Note: Before applying power to the unit, make sure the AC power selector
switch is set for the proper voltage setting.
USING AN EXTERNAL DC POWER SOURCE
The Gemini 3300 can be operated from a D.C. power source that provides
11-14 VDC at the unit’s rated power consumption (700 mA). 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 3300 has an internal
non-volatile memory in which the count and programming information are
stored at power-down. Refer to the “Block Diagram” section.
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 3300 can be purchased with a 20 mA Current Loop
Communications Option. On these units, refer to the “Current Loop
Communications” section of the manual, for wiring and operational
procedures of the Serial Loop.
INPUT A & MAGNETIC PICKUP INPUT
The Magnetic Pickup Input and Logic Input A utilize some common
circuitry. For this reason the Input A switches are used to set up both the
Magnetic and Logic Input A. S1 selects between Magnetic Pickup Input and
Logic Input A. WHEN A MAGNETIC PICKUP 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 effect the Magnetic Pickup
Input and their settings are inconsequential. When S1 is in the Logic position,
the Magnetic Pickup Input is disabled and Input A can be used as a logic input.
Note: A Magnetic Pickup type sensor should not be used unless a signal of
sufficient amplitude is provided at all speeds of operation.
INPUT B
Input B is designed specifically for Logic type inputs. When Input A is set
up for Logic operation, both Inputs A and B operate identically. DIP switch
positions S5, S6, and S7 function the same as S2, S3, and S4.
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