Bogen PCMZPM, Manual

Page: 7 / 8

Note: PCMZPM modules with a label on the top marked "PCM2000 -B" are
high-power versions and can operate with 250W amplifiers. Such models
require Model PCMPS2
1
2V DC,
1
.5A power supply to operate properly.
Relay Driver Output
Each zone module has three relay driver outputs: RD A, RD B, and RD C - one
for each speaker zone. When a zone is active, its relay driver is shorted to RD
COM through an open collector transistor. These drivers can be used to acti-
vate external relays to provide greater power capacity or to operate external
equipment. The power supply for these relays must be
1
2V DC or less. The total
sink current per driver cannot exceed
1
00 mA.
NOTE: Some power supplies are rated at 1 2V DC, but when lightly loaded are consid-
erably higher in output voltage. If the power supply for the relay has an unloaded out-
put of greater than
1
3V DC, the relay drivers may begin to conduct, energizing the
relay. If this problem occurs, you can either replace the supply with a regulated supply
or use a lower voltage supply.
PCMZPM PCMZPM
2 7
Connections to Relay Drivers
SUPPRESSION DIODES