Watlow PM LEGACY PM3 - Page 26

Watlow PM LEGACY™ Limit Controller • 26 • Chapter 2 Install and Wire
Warning:
ç
Use National Electric (NEC)
or other country-specific
standard wiring and safety
practices when wiring and
connecting this controller to
a power source and to elec-
trical sensors or peripheral
devices. Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life.
Note:
Maximum wire size termina-
tion and torque rating:
• 0.0507 to 3.30 mm
2
(30 to
12 AWG) single-wire termi-
nation or two 1.31 mm
2
(16
AWG)
• 0.56 Nm (5.0 in-lb.) torque
Note:
Adjacent terminals may be
labeled differently, depending
on the model number
.
Note:
To prevent damage to the
controller, do not connect
wires to unused terminals.
Note:
Maintain electrical isolation
between analog input 1, dig-
ital input-outputs, switched
dc/open collector outputs
and process outputs to pre-
vent ground loops.
Quencharc Note:
Switching pilot duty inductive
loads (relay coils, solenoids,
etc.) with the mechanical
relay, solid state relay or
open collector output options
requires use of an R.C. sup-
pressor.
Output 1, 3 Switched DC/Open Collector
dc - (open collector)
dc +
common
X_
W_
Y_
Slot A, B
Switched DC
• Maximum open circuit
voltage is 22 to 25V (dc)
• 30mA max. per single out-
put
• Typical drive; 4.5V (dc)
@ 30mA
• Short circuit limited to
<50mA
• NPN transistor sink
• Use dc- and dc+ to drive
external solid-state relay
• 1-pole DIN-A-MITE: up to
4 in parallel or 4 in series
• 2-pole DIN-A-MITE: up to
2 in parallel or 2 in series
• 3-pole DIN-A-MITE: up to
2 in series
Open Collector
• 100mA maximum output
current sink
• 30V (dc) max. supply
voltage
• Any switched dc output
can use the common ter-
minal.
• Use an external power
supply to control a dc
load, with the load positive
to the positive of the pow-
er supply, the load nega-
tive to the open collector
and common to the power
supply negative.
See Quencharc note.
Switched DC
common
24V
X
_
dc +
dc -
W
_
Y
_
Open Collector
Load
Power Supply
dc -
common
24VDC
X
_
W
_
Y
_
Output 1: (X1,-W1,+Y1)
PM[3,6] _ _ _ [C] J - _ A _
_ G_ _
Output 3: (X3,-W3,+Y3)
PM6 _ _ _J - _ A [C] _ G_
_