S600+ Instruction Manual
3-4 CPU Module Revised July-2017
3.2 Power Supply
The power connection is a plug-in, standard 5 mm pitch screw terminal
block on the CPU module. The power supply connector is labeled TB-
1. Refer to Table 3-1 for the TB-1 pin connections.
Power the S600+ using a nominal 30 Volts dc power source capable of
supplying 2 Amps. The S600+ operates between 20 and 32 Volt dc.
The startup in-rush current may draw 6 amps for approximately 100
milliseconds. This in-rush becomes significant when multiple flow
computers are connected to the same power supply.
An on-board anti-surge fuse (2.5 Amp slow blow rating) protects the
supply line should a fault occur within the unit.
Fully regulated 15 and 24 Volts dc supplies are also available for
applications such as powering loops or pre-amplifiers. Resettable
thermal fuses protect these outputs.
Table 3-1. TB-1 Pin Connections (Power)
3.2.1 Watchdog Relay
A single pole, double-throw relay with Normally Open or Normally
Closed terminals provides the watchdog status from pins 6, 7, and 8 of
TB-1. Table 3-2 shows the TB-1 pin connections. Connection is
through plug-in, standard 5 mm pitch screw terminals.
The relay is energized during normal operation. A CPU failure causes
the relay to de-energize.
Note: Contact is rated at 1 Amp, 30 Volts dc and 30 Volts ac, and is a
Form “C” contact.
Table 3-2. TB-1 Pin Connections (Watchdog Relay)
3.2.2 On-Board Battery Backup
The backup battery (see Figure 3-2) retains the contents of the SRAM
on the CPU module, the PC-compatible BIOS CMOS memory area,
and the calendar clock. The battery, a Lithium 3.0 volt 1500
mAmp/hour unit, is user-replaceable. For further battery specifications,
see the technical specification (S600+). To ensure that the battery is
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