Watlow DIN-A-MITE Style C - Manual (Page 11)

WATLOW DIN-A-MITE Style C User's Manual 11
Current
Transformer
(CT)
Heater
Load Wire
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1 2 3
4
Signal Alarm
Gain
Bias
Open
Heater
Limit
+
-
CT1
CT1
Adjustment
Potentiometers
Input Signal:
+
-
Zone
1
Zone
2
Zone
3
5 6
Input Wiring Phase Angle with Current Limit
The DC1 _ - _ _ L _ - 0 _ _ _ model is a phase angle-controller that can
limit the maximum current to the load. A potentiometer on the DIN-A-
MITE adjusts the current limit setting. Use the following steps to
adjust the current limit on initial setup. The purpose of the procedure
is to bring the power to the load slowly so that the desired maximum
current to the load is not exceeded before the current limit is adjusted.
NOTE: The DIN-A-MITE is shipped factory-calibrated with the potentiometer
adjusted fully clockwise (no current limiting). Adjust the potentiometer clockwise
to increase the current; counterclockwise to decrease the current.
NOTE: A short overcurrent through the load may occur, as the circuitry detects the
high current, if the input signal from the temperature controller is abruptly
increased.
1. Attach a clamp-on ammeter to the load line.
2. Adjust the current limit potentiometer fully counterclockwise (for
minimum current flow).
3. Turn the temperature controller on and adjust the input signal to
the DIN-A-MITE for zero percent power.
4. Turn on the power to the DIN-A-MITE.
5. Gradually increase the input signal.
6. Adjust the current limit potentiometer clockwise until the current to
the load is measurable. The current limit indicator (Zone 3) light
should turn on until the output is allowed to go full on, with no
limit. At that point, the indicator light will turn off.
7. Gradually increase the input signal to 100% power, then adjust the
current limit potentiometer to obtain the desired maximum current
to the load.
Ó 1
WARNING:
Use National Electric (NEC)
or other country-specific
standard wiring practices to
install and operate the DIN-
A-MITE. Failure to do so may
result in damage to
equipment and property,
and/or injury or loss of life.
Ó 2
WARNING: Wiring examples
show L2 in phase-to-phase,
200VÅ (ac) and above
configuration. In phase-to-
neutral, 100VÅ (ac) and
above applications, L2 is
neutral and must not be
fused or switched. Failure to
follow this guideline could
result in personal injury or
death.
Ó
3
WARNING:
Only authorized and qualified
personnel should be allowed
to install and perform
preventive and corrective
maintenance on this unit.
Failure to follow this
guideline could result in
damage to equipment, and
personal injury or death.
NOTE:
The alarm options are not
available with phase angle
units.
Current Limit Adjustment Procedure
з
У
1
(Model DC1 _ - _ _ L [0, 1, 2, 3, 4, 5] - _ _ _ _ )
Linear current and linear voltage input
The Zone 3
indicator light
serves as the
current-limit
indicator in
phase-angle,
current-limit
models.