13
Installation and Maintenance Manual
Federal Signal
www.fedsig.com
Connecting to Remote Devices
Figure 2 Connections on the back of Model 300MB
NOT USED
NOT USED
+ 24VDC
- 24VDC
POWER DOWN
NO
NC
COM
ENABLE
SIGNAL
MIC OUT
SIG COM
SIG HI
SIG
SIG
SIGNAL
ENABLE
COM
NC
NO
COM
MESSAGE 1
MESSAGE 2
MESSAGE 3
MESSAGE 4
MESSAGE 5
MESSAGE 6
290A7329
PTT RELAY
CASCADE IN
CASCADE OUT
POWER MONITOR RELAY
25 VRMS LINE
GND
120/240 Vac
CLASS II FIELD WIRING
COMPARTMENT
CLASS I FIELD WIRING
COMPARTMENT
KNOCK-OUTS IN
REAR OF HOUSING
MODEL 300MB REAR VIEW
(BACK OF HOUSING IS REMOVED FOR CLARITY)
OUTPUT LEVEL
TB2
TB1
10 9 8 7 6 5 4 3 2 1
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
For non-SelecTone 25 V
RMS
speakers, such as ceiling speakers, connect the signal lines
directly to TB1-13 and TB1-14 of terminal block TB1. Before using TB1-13 and
TB1-14, remove the labeled jumper. Signal line losses must be considered when
calculating how many speakers can be connected to the 300MB.
Connecting to Remote Devices
Physically install the remote SelecTone device(s) following the instructions included
with the device.
Balanced Line Application
For 300GC, 300GCX, 300X, 302GC, 302GCX, 302X or 50GC speakers, an AM25CK
Connector Kit is required for connection to the balanced signal output of the 300MB.
The AM25CK properly terminates the balanced signal lines to the amplifier in the
300GC, 300GCX, 300X, 302GC, 302GCX, 302X and 50GC.
Remove the labeled jumper from terminals TB1-13 and TB1-14 of terminal block TB1.
Connect the white input wires on the AM25CK to the terminals TB1-13 and TB1-14 of
terminal block TB1 on the 300MB as shown in Figure 3. The AM25CK and AM70CK
Connector Kits are NOT polarity sensitive, but polarity must be observed when placing
speakers in close proximity to each other.
Figure 3 Model AM25CK connections (balanced line)
300GC
TERMINAL BLOCK (TB1)
ON REAR OF 300MB
AM25CK
300GC
AM25CK
14 13
290A7443
SHIELDED TWISTED PAIR
SIGNAL LINE TO ADDITIONAL
SELECTONES
