ABB MagMaster Instruction Manual page 15

3.4.3 Alarm Outputs – Fig. 3.18
Information.
• Inductive loads may be suppressed by diodes (D) – 1N4004 or similar.
• Inrush currents are limited to 1 Amp by resistor R – e.g. 27Ω 1W for 24V systems.
• Operation of outputs is programmable – see Configuration Manual for details.
• Frequency and Alarm outputs share a common return with contact input.
• External isolators not normally required, as the pulse, alarm and contact circuits are electrically
separated from all other Magmaster connections.
Alarms
Information.
Relay and Timer Switch shown for example
only. Connect as required.
3.4.4 Contact Input – Fig 3.19
Switch
– +
4 7 .5
5 0 .0
MagMaster Transmitter
ALARM1
ALARM2
PLS0V
Fig. 3.18 Alarm Output Connections
EXT I/P +
EXT I/P –
MagMaster Transmitter
Volt-free Contact
PLS0V
EXT I/P +
EXT I/P –
MagMaster Transmitter
Open Collector (or Grounded Contact)
Fig. 3.19 Contact Input Connections
3 ELECTRICAL INSTALLATION...
Timer
d.c.
Switch
Alarm 1
supply
+ R
Alarm 2
and/or
Relay
Relays and Timers
5V d.c. supply
+
PLS0V
Switch
EXT I/P –
MagMaster Transmitter
Voltage Signal or Logic Signal
ALARM 2
EXT I/P +
EXT I/P –
MagMaster Transmitter
Using an Alarm for Automatic
Range Change
MagMaster Transmitter
ALARM1
ALARM2
PLS0V
13