3.2
Heater Restrictions. The heating outlets (10) deliver 15 amps of current at 120 VAC into resistive
loads (heating mantles, hot plates, ovens, etc.). Use only resistive loads that are safely operated at 120
VAC and require less than 15 amps or damage to the controller and a safety hazard may result.
•
Do not plug oil baths into your controller. Oil baths are not 120 VAC devices and
will become a fire hazard (to use oil baths, request application note AN1 or download it
from http:/www.jkem.com).
•
Devices other than resistive loads can be plugged into the heating outlets but certain
restrictions apply.
Device Type
Restrictions
Comments
Incandescent lamps
Infrared heaters
1200 watts
≤
Set the power reduction circuit
to the > 2 L position.
Inductive loads:
* solenoids
* transformers
* motors
6 amps; 720 watts
≤
1/3 horsepower
≤
The controller must be
programmed for this use.
Request application note AN5.
3.3
Ramp-to-Setpoint & Soak Feature. A new feature of J-KEM’s controllers called
‘Ramp-To-Setpoint’ allows you to enter a specific heating rate (e.g., heat to 120
o
C at a rate of 5
o
C/Hour),
a second feature called ‘Soak’ then lets you specify how long to stay at that temperature before turning
off.
Examples of Program Ramps
.
Setpoint
T
em
pe
ra
tu
re
Time
Ramp
Soak
Power Off
Setpoint
T
em
pe
ra
tu
re
Time
Ramp
Soak
Power Off
The controller is shipped with the Ramp-to-Setpoint feature OFF, the user must specifically turn Ramp-to-
Setpoint ON. When Ramp-to-Setpoint is OFF, the controller heats to the entered setpoint at the fastest
rate possible. When Ramp-to-Setpoint is ON, the controller heats at the user entered ramp rate.
The Ramp-to-Setpoint feature and its associated parameters are turned on and set in the controller’s
programming mode. The parameters of importance are:
SPrr
SetPoint Ramp Rate. Allowable Values: 0 to 9990 deg/Hr.
This specifies the desired rate of heating (cooling). Note, this parameter specifies the desired rate of
heating (cooling), but in cases of extremely high ramp rates the reaction will not actually heat faster than
the power of the heater will allow.
12
