Scanner 2000 Steam Mass Flow Transmitter ... - Spirax Sarco

Section 3 Scanner ® 2000 microEFM
When an external power supply is used as the primary power source, the lithium battery pack serves as
a backup power supply. The use of an alternate power source extends battery life and helps ensure that
timekeeping and volume accumulation will not be interrupted during a power failure.
External Power Supply
The Scanner 2000 can be connected to a remote power supply by a two-conductor cable (Figure 3.3). The
power supply and cable must be capable of supplying 6 to 30 VDC @ 50 mA.
The external power supply must be an approved SELV source, insulated from the AC main by double/
reinforced insulation per CSA C22.2 No.61010-1-04 / UL 61010-1 – 2nd Edition.
Important In all applications using an external power supply, a switch or circuit breaker must be included
in the safe area external power supply installation within easy reach of the operator.
The switch or circuit breaker must be marked as the “disconnect” for the safe area
external DC power supply.
Important If the main circuit board is marked with a revision level of 02 or older (revisions 01, C, B,
or A), a zener diode (Part No. 1.5KE33CA) must be installed for CE approval. The zener
diode is not required for revision 03 and newer circuit boards.
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POWER
SUPPLY
6 to 30
VDC
GND
GROUND
SCREW INSIDE
ENCLOSURE
Figure 3.3—External power supply wiring
1 7
2
8
3
9
4
SCANNER 2000
10
5
Main Circuit Board
11
6
PN: 9A-30160010
12
J2 TB1 TB2
RTD
I+ R+ R- I-
–
TFM 1
+
SWITCH
13 14
DIG OUT 1
TB3
BATTERY
J1
POWER
PORT 2 PORT 1
+ – + – + –