R&M Materials Handling VARIABLE SPEED CONTROLS ControlMaster Plus Service Manual - Manual (Page 50)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
50/83 R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
7 MULTICARE FUNCTION
Two inverter drives can be operated simultaneously in “tandem mode” by utilizing the multicare function. The two drives
are connected together using their analog outputs and analog inputs. The analog output of one drive is connected to the
analog input of the other drive, and vice versa. Both drives alter the voltage value of their own analog output signal
according to run conditions whenever the multicare mode is selected. The table below shows the input (receive) and
output (send) values during start, acceleration, stopping and in fault situation. The multicare function is selected with an
input parameter (P2.1.5). In case of multicare fault, a dedicated fault code (F70) is issued. If the operation of one drive is
interrupted, or the drive faults out (for example upper limit fault), the other drive will stop and show multicare fault (F70).
Programmable pushbuttons are used for multicare testing. The multicare function is mainly designed for EP mode (speed
correction possible) but it can also be used in MS (multistep) mode for run/stop supervision without speed correction.
Ain1 value Input function
(receive)
Aout value Output function
(send)
0…0.2 V Single drive selected. Multicare function not used. 0 V Direction signals S1 and S2 not active in multicare mode.
0.3…0.7 V Brake open acknowledged, acceleration not
allowed.
0.5 V Brake open, acceleration not allowed.
0.8…1.0 V Acceleration allowed. 1.0 V Acceleration allowed.
1…9 V Speed correction range. 1…9 V Speed correction range.
9 V Acceleration acknowledged. 9 V Accelerating.
>9.5 V Fault acknowledged. Immediate brake stop. F70
fault code issued. 10 V Fault. Immediate brake stop.
The multicare function controls and monitors the following situations in multicare mode:
-
Both drives start nearly simultaneously (the other drive has 0.5 seconds to respond) and begin to accelerate at the
same time, once both brakes are opened.
- Both drives end up running at the same “reference speed” after acceleration or deceleration (EP hold situation) –
speed correction is not possible at minimum speed or full speed. The correction takes place whenever the two
reference speed values deviate more than 1 %, or about 1 Hz.
- One drive faulting out stops the other and the other drive will issue a multicare fault (F70).
- When only one hoist is selected for operation, the analog signal remains at zero volts and this disables the multicare
mode – in case of one hoist drive being faulty (active fault is not cleared when a starting command is issued), the
analog signal would remain at 10 volts (fault condition) and both hoists would be inoperational. The solution for
allowing the operation of one hoist in single mode, is to open up the analog connection between the two drives with
the help of a small relay (see picture below) – this relay must be capable of connecting DC current.
2.12 Connections
The analog output of one drive is connected to the analog input of the other drive, and vice versa (see below). A shielded
cable is used to establish the analog signal connection between two drives. Both ends of the cable shield must be
grounded using 360-degree grounding whenever possible.
2.13 Setup
- Verify the connection of analog inputs and outputs and cable shield grounding (both ends).
- Enable the multicare function in both drives - parameter “Analog Input Sel” (P2.1.5=Multicare).
- Verify parameters P2.1.6…P2.1.10 and P2.2.8…P2.2.12 are the same for both drives.
- Activate pushbutton “Test Voltage Max” (B2.1.12.2=”On”) in both drives – this produces a test voltage of 9 V (analog
output) for calibrating the maximum value of speed correction.
- Read “Ain Value” (V2.1.12.3) and use this value (about 9 V) for speed correction calibratation – set “Max Value Volt”
(P2.1.12.5, both drives) equal to received “Ain Value” – this value is likely the same for both drives.
- Activate pushbutton “Test Voltage Min” (B2.1.12.1=”On”) in both drives – this produces a test voltage of 1 V (analog
output) for calibrating the minimum value of speed correction.
- Read “Ain Value” (V2.1.12.3) again and use this value (about 1V) for speed correction calibration – set “Min Value
Volt” (V2.1.12.4, both drives) equal to received “Ain Value” – this value, again, is likely the same for both drives.
- Reset both programmable pushbuttons (B2.1.12.1=”Off” and B2.1.12.2=”Off”, both drives).
A
Aout
Ain1+
0V
Ain-
X1:26
X1:23
X1:27
X1:25
B
Ain1+
Aout
Ain-
0V
X1:23
X1:26
X1:25
X1:27