Grundfos CIU 501 User Manual

9.5 Pump control register block
Registers in this block can be read by means of function codes 0x03 and/or 0x04. They can be written as holding registers with function codes
0x06 and 0x10.
Address Register name Description
00101
Bit 0: RemoteAccessReq
Control bit that sets local or remote control.
0: Local
1: Remote (controlled by Modbus master).
Set this bit to 1 if a Modbus master should control the E-pump.
You can read the actual status from register 00201 bit 8.
Bit 1: OnOffReq
Control bit that switches the E-pump on or off.
0: Off (stop)
1: On (start).
You can read the actual status from register 00201 bit 9.
Bit 2: ResetAlarm
Control bit that resets alarms and warnings from the E-pump.
0: No resetting
1: Resetting alarm.
This control bit is triggered on rising edge only, i.e. setting logical 0 to 1.
See section CIM configuration register block, address 00005, for acknowledgement behaviour.
Bit 4: CopyToLocal
Control bit that enables copying of remote settings to local pump settings.
Only available on MAGNA3, CUE and MGE model H and later.
0: Disabled
1: Enabled.
You can read the actual status from register 00201 bit 1.
Note that copy of the Control Context, which is Control mode, Operating mode, On/off and Setpoint, from
the remote setting to the local setting takes place when CopyToLocal has been enabled, but only during a
Remote->Local transition.
It is necessary to introduce such a transition whenever the user wants the local setting to be updated and
stored in the EEPROM.
Bit 5: EnableMaxFlowLimit
Control bit that enables or disables the FLOWLIMIT function. Set the maximum flow limit value in register
00106. Only available on MAGNA3 and MGE model H and later.
0: Disabled (only used in control mode FLOWADAPT)
1: Enabled (used in all control modes).
You can read the actual status from register 00201 bit 2.
Bits 6-15: RESERVED -
00102 ControlMode
Sets the control mode enumeration.
Some modes are not supported by all E-pumps.
0: Constant speed
1: Constant frequency
3: Constant head
4: Constant pressure
5: Constant differential pressure
6: Proportional pressure
7: Constant flow
8: Constant temperature
9: Constant differential temperature
10: Constant level
128: AUTOADAPT
129: FLOWADAPT (set FLOWLIMIT in register 00106)
130: Closed-loop sensor.
131: AUTOADAPT(CP)
You can read the actual control mode from register 00203.
00103
OperationMode
A state enumeration to control the E-pump operating mode.
0: Auto-control (setpoint control according to selected control mode)
4: OpenLoopMin (running at minimum speed)
6: OpenLoopMax (running at maximum speed).
Note that "OnOffReq" has higher priority than "OperationMode", meaning that you must set "OnOffReq" to
"On" for "OperationMode" to have any effect.
You can read the actual operation mode from register 00204.
00104 Setpoint
Sets the E-pump setpoint.
The scale is 0.01 %, so the value must be from 0 to 10000 to represent the entire 0-100 % range.
Closed loop:
Percentage of setpoint range.
Open loop
Percentage of nominal frequency.
Common examples
4700: 47 %
8000: 80 %.
You can read the actual setpoint from register 00338 UserSetpoint
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English (GB)

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English