Warm Up Percentage; Warm Up Control; Monitor Out - Lakeshore 335 User Manual

72 c 5: Advanced Operation
HAPTER
5.5.1 Warm Up
Percentage

5.5.2 Warm Up Control

5.6 Monitor Out

Model 335 Temperature Controller
Use the Warm Up Percentage parameter to determine the voltage amount to apply to
the voltage output (Output 2) when using Warm Up mode to control an external
power supply. The voltage applied will be the full scale output (+10 V) times the
Warm Up Percentage. For example, if the Warm Up Percentage is set to 50%, the con-
trol output voltage for the given unpowered output will be 50% of 10 V, or 5 V, when
the output is on.
Menu Navigation:
Output SetupQOutput 2QOutput Type (Voltage)Q Output Mode (Warm Up Supply)
QControl Input (A,B)
ENTER
Default: 100%
Interface Command: WARMUP
The Warm Up Control parameter determines what happens when the control set-
point is reached. The options are:
Auto-Off: once the Heater Range is set to on, the Warm Up Percentage voltage is
D
applied to the output (section 5.5.1) and the output stays on until the control
input temperature reaches the control setpoint. The output will then be turned
off (0 V), and the Heater Range setting will automatically be set to Off, effectively
turning off all temperature control for the control loop. If the Heater Range is
again manually set to On, the cycle will begin again, and the output will turn on
and stay on until the control input temperature reaches the setpoint again.
Menu Navigation:
Output SetupQOutput 2QOutput Type (Voltage)Q Output Mode (Warm Up
Supply)QControl Input (A,B)
Interface Command: WARMUP
Continuous: this mode implements what is often referred to as On/Off control.
D
Once the Heater Range is set to on, the Warm Up Percentage voltage is applied to
the output until the control input temperature reaches the setpoint. Then the
output will turn off (0 V) until the temperature falls 1 K below the setpoint, at
which point the Warm Up Percentage voltage is again applied to the output. The
Heater Range will never be automatically set to Off in this mode.
Menu Navigation:
Output SetupQOutput 2QOutput Type (Voltage)Q Output Mode (Warm Up
Supply)QControl Input (A,B)
Default: Continuous
Interface Command: WARMUP
In Monitor Out mode, the voltage output (Output 2) tracks the assigned Control Input
according to the scaling parameters you entered. A common use for this function
would be to send a voltage proportional to temperature to a data acquisition system.
The Control Input parameter setting determines which sensor input is tracked by the
output. The remaining parameters detailed in this section dictate how the output
value is determined.
An output configured to Monitor Out mode is not affected by the ALL OFF key, as it does
not have a Heater Range setting, and by design is always enabled.
Menu Navigation:
Output SetupQOutput 2 QOutput Type (Voltage)QOutput Mode (Monitor Out)Q
Control Input (None, Input A, Input B)
Default: Control InputQNone
Interface Command: OUTMODE
QWarm Up Percentage (0% to 100%)
QWarmup Control (Auto-Off)
ENTER
QWarmup Control (Continuous)
ENTER