gefran 850 Installation And Instruction Manual page 273

CONTROL FUNCTIONS
Type
Control
Control output
CONTROL
Control output for motorized
valves
Number of programs
SETPOINT
PROGRAMMER
Number of steps
(Double programmer if
double loop)
Number of setpoints
MULTIPLE
SETPOINTS
Digital function blocks
LOGIC
OPERATIONS
1
Analog function blocks
OPERATIONS
MATHEMATICAL
1
Modes
TIMER FUNCTION
ENERGY COUNTER
DIAGNOSTIC
Type
RETENTIVE MEMORY
Max. number of writes
(*) if in standard mode; if in "Simplified programmer" mode, Max 12 programs
(**) freely selectable in any program, if in standard mode; if in "Simplified programmer" mode, MAX 16 steps per program, in a set
order: Program 1 Step 1-16, Program 2 Step 17 – 32, and so on
80209C_MHW_850-1650-1850_01-2020_ITA_pag. 271
Single loop, double loop
PID, ON/OFF, single action heat or cool, double action heat/
cool
Continuous or ON/OFF
Cycle time: constant or optimized (BF)
OPEN/CLOSE for floating motorized valve or with feedback with
position control by potentiometer on Relay, Solid-state, Triac
outputs.
Max 16 (if double loop 8 + 8) (*)
Start / Stop / Reset / Skip via digital inputs and/or outputs from
logic operations
Output state: Run /Hold / Ready / End
Max 192, each with own setpoint, ramp time and hold time (**)
Times settable in HH:MM or MM:SS
Max 4 consents, configurable for ramp and for hold
Max 4 events, configurable in ramp and in hold
Max 4, selectable from digital input
Each setpoint change is subject to set ramp, different for up
and down ramp
Max 32, with 4 input variables per block.
The result can act on the state of the controller, of the programmer
on alarms and outputs.
Each function contains a block type AND, OR with TIMER
Max 8, with 2 input variables per block, with operators such as +
, - , × , : , average, square root, ...
The result may act on analog variables in input to PID loops (con-
trolled variable, setpoint) or analog outputs .
START / STOP (2 timer if double loop)
STABILIZATION (timer is on when PV enters a band set around
setpoint; at end of count you can activate an output, shut down
SW or change SP1/SP2)
FIRING (timed activation of control after power on)
Calculation done on nominal line voltage and nominal load power or
on rms current measured on load via CT
Short circuit or open circuit (LBA alarm)
Interrupted or partially interrupted load (HB alarm)
Short circuit of control output (SSR alarm)
FRAM
Number max: > 10 cycles
10
Retention: > 10 anni