74
RTAA-IOM-3
If the potentiometer is to be remotely
mounted, it and the resistor must be
connected to the UCM prior to
mounting. Then, with the UCM display
in Menu 0 and the display advanced to
“Active Current Limit Setpoint”, the
UCM can be used to calibrate the
positions of the potentiometer to
correspond with the desired settings
for the current limits. External resistor
input values for various current limit
setpoints are shown in Table 14.
2. 2-10 VDC Voltage Source Input
Set DIP Switch SW1-2 of Options
Module 1U2 to “OFF”. Connect the
voltage source to terminals TB1 -7 (+)
and TB1 -8 (-) of Options
Module 1U2. CLS is now based on the
following equation:
CL Setpoint % = (VDC x 10) + 20
Sample values for CLS vs. VDC signals
are shown below:
Minimum setpoint
= 40% (2.0 VDC input)
Maximum setpoint
= 120% (10.0 VDC input)
Maximum continuous input voltage
= 15 VDC
Input impedance = 40.1 Kohms
(SW1 -2 off)
3. 4-20 mA Current Source Input
Set DIP Switch SW1-2 of Options
Module 1U2 to “ON”. Connect the
current source to terminals TB1 -7 (+)
and TB1 -8 (-) of Options Module 1U2.
CLS is now based on the following
equation:
CL Setpoint % = (mA x 5) + 20
Sample values for CLS vs. mA signals
are shown in Table 14.
Minimum setpoint = 40% (4.0 mA)
Maximum setpoint = 120% (20.0 mA)
Maximum continuous input current
= 30 mA
Input impedance = 499 ohms
(SW1 - 2 on)
Note: The negative terminal TB1 -8 is
referenced to the UCM chassis ground.
To assure correct operation, 2-10 VDC
or 4-20 mA signals must be isolated or
“floating” with respect to the UCM
chassis ground. See Figures 31 thru 32.
Optional Bidirectional
Communications Link (BCL)
This option allows the UCM in the
control panel to exchange information
(e.g. operating setpoints and Auto/
Standby commands) with a higher
level control device, such as a Tracer, a
multiple-machine controller or a
remote display panel. A shielded,
twisted-pair connection establishes the
bidirectional communications link
between the unit control panel and the
Tracer, multiple-machine controller or
remote display panel.
Note: The shielded, twisted-pair
conductors must run in a separate
conduit.
Caution: To prevent control
malfunctions, do not run low
voltage wiring (<30 V) in conduit
with conductors carrying more
than 30 volts.
General
Field wiring for the communication link
must meet the following requirements:
1. All wiring must be in accordance
with the NEC and local codes.
2. Communication link wiring must be
18 AWG shielded, twisted-pair wiring
(Belden 8760, or equivalent).
3. The maximum total wire length for
each communication link is 5,000
feet.
4. The communication link cannot pass
between buildings.
5. All UCM’s on the communication link
can be connected in a “daisy chain”
configuration.
Communication Link
Connection Procedure
1. Refer to the Tracer installation
literature to determine proper
communication link termination
connections at the Tracer unit.
2. Refer to RTAA-IOM-2 for installation/
operation of Remote Display Panel.
3. Connect the shield of the
communication link wiring to the
designated shield terminal at the
Tracer unit.
4. Connect leads 561 and 562 from the
proper terminals of 1U2,TB2 on the
UCM to the Tracer, as shown in
Figures 31 thru 33. There is no
polarity requirement for this
connection.
5. At the UCM the shield should be cut
and taped to prevent any contact
between the shield and ground. See
Figures 31 thru 33.
Note: On multiple-unit installations,
splice the shielding of the two
twisted-pairs that come into each
UCM in the “daisy chain” system.
Tape the spliced connections to
prevent any contact between the
shield and ground. At the last UCM
in the chain, the shield should be cut
and taped off.
6. For unit ICS address selection see
menu item “4C”.
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