Watlow DIN-A-MITE Style B User Manual page 9

V~
(ac)
120 or 240V~ (ac)
@ 300mA maximum
energizes on alarm
NOTE: The current transformer must be in the center uncontrolled leg on a 2-leg DIN-A-MITE.
WATLOW DIN-A-MITE Style B User's Manual
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Ungrounded Delta or Wye Load
High-limit
Contactor (CR1)
Semiconductor
Fuses
1 2 3
Signal
7
8
9
10
Alarm Relay
11
DB20-60C0-S000
or Indicator
12
13
14
15
1A
CT
16
4 5 6
Transformer (CT)
Triac
13 14
Reset Switch
RY1A
RY1
Coil
(External alarm relay
contacts, set A)
Latching Alarm Relay Circuit
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Non-latching Alarm Option
_ _ _ _
(models DB_ _ -
Shorted SCR (silicon-controlled rectifier) Alarm
Non-latching Operation
The shorted SCR detector compares the input
command signal and actual load current. If load
current is present without an input signal then the
shorted SCR alarm will energize the alarm triac
output. This is a non-latching alarm. This output can
be used to drive various indication devices, such as a
coil, light, buzzer, etc. See the alternative latching
circuit section below.
6
5 4
Ungrounded
Wye Load
Current Delta
Load
L1
VÅ
L2
3-phase, 2-leg DIN-A-MITE
- S _ _ _ )
NOTE:
Use a grounding conductor
terminal plate (fork
terminal) having upturned
lugs or the equivalent to
hold the wire in position.
Maximum 6 mm 2 (10 AWG)
wire.
(External alarm relay
RY1B
contacts, set B)
Normally open
Common
Normally closed
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9