Stafford Instruments ST535C, Руководство пользователя

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ST535C Handbook Page 33
Configuration Notes
Parameter Note
10 Setpoint offset for zone 1: This is added to the setpoint defined by the user program. This will
normally be left at 0. Units are °C.
19 Differential Trip (Error 9): This is the temperature differential allowed between zones during firing.
This trip is only active when zone 1 (the master zone) is above 600°C. If either zone 2 or zone 3
temperature deviates from zone 1 temperature by ± the selected amount then ERROR 9 will occur
after a short hold - off delay. Units are °C.
20 Setpoint offset for zone 2: This is added to the current temperature of zone 1 (for control strategy =
differential), or is added to the setpoint defined by the user program (for control strategy = absolute).
Ignored for single zone kilns. Units are °C.
22 PID I for zone 2: This is set to 0 by default to disable the integral action, which will cause zone 2 to
achieve a slightly lower temperature than the setpoint. This can be corrected either by setting a
value of (say) 400 for this parameter (at the risk of possible interaction between zones), or, by setting
a positive value for parameter no. 20 (setpoint offset).
30 Setpoint offset for zone 3: This is added to the current temperature of zone 1 (for control strategy =
differential), or is added to the setpoint defined by the user program (for control strategy = absolute).
Ignored for single or 2 zone kilns. Units are °C.
32 PID I for zone 3: This is set to 0 by default to disable the integral action, which will cause zone 3 to
achieve a slightly lower temperature than the setpoint. This can be corrected either by setting a
value of (say) 400 for this parameter (at the risk of possible interaction between zones), or, by setting
a positive value for parameter no. 30 (setpoint offset).
40 Zones: Zone 1 is the master zone which should be allocated to the slowest zone, usually the bottom
zone in a kiln.
41 Control strategy: Absolute control strategy is the default. With this strategy all the zones follow the
same user programmed set point. Differential control strategy is also available. With this strategy
the setpoint for zone 1 is as defined by the user program but the setpoint for zones 2 & 3 is the
currently achieved actual temperature of zone 1. This strategy ensures that zones 2 & 3 are always
able to follow zone 1 (the slowest zone). Control strategy is ignored for single zone kilns.
43 Engineer lock - up on error: If this feature is enabled then errors cannot be cleared by cycling the
power to the controller i.e: cannot be cleared by the user. This forces an engineer call out to
determine the cause of the error and a repair to be implemented.
45 Relay Output1: this is a programmable event1/damper/fan output. If set to event mode then this
output is controlled by the user program to open or close at the start of each ramp and to open or
close at the start of each soak. If set to damper or fan mode then the user is able to enter damper
open & close temperatures or fan on and off temperatures.
46 Remember start delay: By default this feature is disabled and the controller sets the initial value for
start delay to 00:00. If enabled the controller remembers the user entered start delay from the
previous firing (useful for repetitive overnight firings). In either case the actual start delay can be
edited by the user.
47 Skip start delay after power failure: By default this feature is disabled and in the event of a power
failure while executing the start delay the controller times off the remainder of the start delay when
power is restored. If enabled the controller immediately starts firing when the power is restored.
Note: the controller does not contain a real time clock and so does not know how long the power has
been off.
49 Relay Output2: this is event 2 output. This output is controlled by the user program to open or close
at the start of each ramp and to open or close at the start of each soak.
60 Operating Units °C/°F: When units are changed the controller will reload its default set of programs
(in either °C or °F units as required). Warning! - this will over - write any existing programs!