Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instruction Manual User Manual
Page 59
2.7.2 SEPARATE 24 V DC POWER SOURCES TO CONTROLLER AND ITBs
The procedure to connect the controller TB2 screw lugs to a controller-dedicated 24 V dc power
source is provided in Table 2-4. The ITB power source must be negatively grounded; the controller
power source can float, be positively grounded, or negatively grounded.
Table 2-4. Controller-Dedicated 24 V dc Power Source
Step
Procedure
See Figure
1
From the negative distribution strip, connect the negative (-) 24 V input line,
via a remote SPST switch (SPST switch is on this input if positive ground),
to TB2-3 (
L2).
Figure 2-15
2
From the positive distribution strip, connect the positive (+) 24 V input line,
via a remote SPST switch (SPST switch is on this input if negative ground or
if power supply floats), to TB2-4 (
L1).
Figure 2-15
3
Connect TB2-1, Power Common (
PC), to a common bus bar that is
connected to earth ground.
Individual wires should connect each controller Power Common (
PC) screw
lug to the common bus bar.
Figure 2-15
Figure 2-16
4
Connect the earth ground to TB2-5, Chassis Safety Ground (
G).
Figure 2-15
Figure 2-15. Controller Dedicated 24 V dc Power Source
1 2 3 4 5
PC L3 L2 L1 G
ONLY ONE SPST SWITCH NEEDED ON
P/S HOT SIDE (UNGROUNDED)
24 V dc
POWER
SUPPLY
-
+
EARTH GROUND
TB2 (REAR OF
CONTROLLER)
AC
COMMON BUS BAR
NEG DIST STRIP
POS DIST STRIP
53MC5000 Process Control Station
2-20