Watlow ez-zone pm - Page 39

Watlow EZ-ZONE
®
PMI Controller • 35 • 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 con-
troller to a power source and to
electrical sensors or peripheral
devices. Failure to do so may
result in damage to equipment
and property, and/or injury or
loss of life.
Note:
Maximum wire size termination
and torque rating:
• 0.0507 to 3.30 mm
2
(30 to 12
AWG) single-wire termination
or two 1.31 mm
2
(16 AWG)
• 0.56 Nm (5.0 in-lb.) torque
Note:
Adjacent terminals may be la-
beled differently, depending on
the model number
.
Note:
To prevent damage to the con-
troller, do not connect wires to
unused terminals.
Note:
Maintain electrical isolation
between digital input-outputs,
switched dc/open collector
outputs and process outputs to
prevent ground loops.
Note:
This equipment is suitable for
use in CLASS I, DIVISION 2,
Groups A, B, C and D or Non-
Hazardous locations only. Tem-
perature Code T4
Warning:
ç
Explosion Hazard – Substitution
of component may impair suit-
ability for CLASS I, DIVISION 2.
Warning:
ç
Explosion Hazard - Do not dis-
connect while the circuit is live
or unless the area is known to be
free of ignitable concentrations
of flammable substances.
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. suppressor.
Example: Using a Current Transformer
Digital Output 5 - 6 PM _ _ [2,4] _ _ - _ _ _ _ _ _ _
common
switched dc
switched dc
98
99
CF
CD
CE
B5
D6
D5
Slot C
Digital Output
• SSR drive signal
• Update rate 10 Hz
• Maximum open cir-
cuit voltage is 22 to
25VÎ (dc)
• PNP transistor
source
• Typical drive; 21mA
@ 4.5VÎ (dc) for
DO5, and 11mA @
4.5V for DO6
• Current limit 24mA
for Output 5 and
12mA Output 6
• Output 5 capable of
driving one 3-pole
DIN-A-MITE
• Output 6 capable of
driving one 1-pole
DIN-A-MITE
24VDC
switched dc outputs
Internal Circuitry
D5
D6
B5
Note:
See output curves be-
low.
Controller
Output N
CT Input
L2 L1
Fuse
SSR
3A x 4
12A
48mA
48mA
12A
x 4 = 48A
Turns around CT
Turns around CT
CT Primary Current
CT Secondary Current
Total current
CT Ratio R = 1000:1
:
I
s
= I
p
T/R = 50mA
CSC = Ip(full scale) = 50mA(R)/T
CSI = Output N
I
s = Current in secondary of current transformer
I
p = Current in primary of current transformer
T = Number of turns through the primary of the transformer
R = Number of turns in the secondary of the current
transformer (Turns ratio, assuming one primary turn)
CSC = Current Scaling (parameter found in Current Menu
of Setup Page)
CSI = Current Source Instance (parameter found in Curr
ent
Menu of Setup Page)