2241A Distribution Panel
INSTALLATION
Section 2
2 - 1
2-1 INTRODUCTION
This section is organized into four
parts dealing with: Receiving Inspection, Power Module
Replacement, Installation, Support and Service.
Receiving Inspection consists of a visual examination
and brief operational checks to verify that the 2241A has
not been damaged in transit. Power Module
Replacement provides a procedure to replace a power
module with the 2241A in service. Installation discuses
mounting, I/O and power hook-up, and configuration.
Support and Service includes factory assistance with
applications, operation and repairs.
2-2 RECEIVING INSPECTION
Prior to shipment each
2241A is tested electrically and inspected for good
mechanical condition. New units should be free of
mechanical defects and new (or repaired) units should
be in good operating order. Inspect the equipment on
receipt to insure that it has not been damaged in transit.
If damage is observed, retain the shipping carton and its
contents and file a claim with the freight carrier.
2-3 RECEIVING OPERATIONAL CHECK
Look at the
rear panel to determine the appropriate power voltage.
AC Units
have a North American Type power cord
attached. If needed - replace the plug on the power cord
with one intended for the local power mains. The AC
mains voltage must be in the range of 90 to 264 Volts
rms. If so, then plug into the power receptacle to power
the unit. (The 2241A does not have a power switch.)
DC Units
have a power terminal block on the left side of
the rear panel. Check the label over the terminal block
to determine the
correct supply voltage and current
requirements. Standard voltages are 12, 24, or 48 VDC.
Prior to connecting the DC Power Supply, check that its
voltage is /- 2 volts of the labeled voltage, and
that it will provide the current listed near the Fuses.
Turn the DC Power Supply OFF
, and connect 2 heavy
gage wires between the power supply and the
+
and
-
terminals on the 2241A - observing the polarity labels.
As a safety precaution, connect a heavy gauge wire
between the Earth (Chassis) Ground and the Earth /
Safety Ground. Then turn on the DC Power Supply to
activate the 2241A.
Check the front panel of the 2241A and observe that
both MAIN and BACKUP LEDs are lit. If one of the
LEDs is not lit, place an OHM Meter across AUDIO OUT
Connector (ALARM) pins 25 and 50. If a power supply
has failed there will be a low OHM reading (<100
Ohms).
If there is
a high OHM reading
, then both
power supplies may be working, but there has been
another failure such as a defective LED. In this case
contact Convex to arrange for return for warranty repair.
If there is a low OHM reading
, then one of the power
supplies is not operating. In this case, remove power
and check the fuse (on the rear of the 2241A) which
corresponds with an unlit LED. Replace any missing or
blown fuses, then reapply power and verify that both
LEDs are lit. If an LED remains unlit after replacing a
fuse, contact Convex for return for repair.
2-3-1 OPERATIONAL CHECK / AUDIO CIRCUITRY
The audio circuitry has been tested prior to shipment
and will not generally need to be rechecked prior to
installation. This procedure is provided so that the
checks can be made when needed. The audio checks
are made using a Convex 806A TIMS Test Set or
equivalent equipment.
Audio checks assume that the
seven Distribution Switches
(S1-S7
) and
Gain Controls
are set to the factory default settings:
Input / 0 dB
.
Set the 806A Generator for 1004 Hz / 0 dBm / 600 Ohm
Send Impedance. Set the 806A Receiver for LEVEL
Mode / 15 kHz Filter / 600 Ohm Termination.
Audio Check.
Drive pins
1/26
of the Audio Input
Connector with the 806A Generator, and use the 806A
Receiver to verify 0 dBm (+/- 0.5 dB) / 1004 Hz on pins
1/26, 2/27, and 3/28 of the Audio Output Connector.
Repeat the above
Audio Check
driving pins
2/27
Repeat the above
Audio Check
for pins
4/29
of the
Audio Input Connector and pins 4/29, 5/30, 6/31 of the
Audio Output Connector.
Repeat the above
Audio Check
driving pins
5/30
Repeat the above
Audio Check
for pins
7/32
of the
Audio Input Connector and pins 7/32, 8/33, 9/34 of the
Audio Output Connector.
Repeat the above
Audio Check
driving pins
8/33
Repeat the above
Audio Check
for pins
10/35
of the
Audio Input Connector and pins 10/35, 11/36, 12/37 of
the Audio Output Connector.
Repeat the above
Audio Check
driving pins
11/36
REAR VIEW
FRONT VIEW
CONVEX 2241A AUDIO / PTT DISTRIBUTION PANEL
CONVEX
2241A AUDIO / PTT DISTRIBUTION PANEL
BACKUP
MAIN
1/2 AMP
90-264 VAC
POWER SUPPLY
BACKUP
DISABLE
NORMAL
KEY
PTT
MAIN
MADE IN USA
S/N
17
13
14
15
16
18
19
20
21
22
23
24
12
11
10
9
8
7
6
5
4
3
2
1
PTT
AUDIO
OUTPUT
OUTPUT
INPUT
INPUT
FUSE
FUSE
