Hook Block Syncing / Pulse Train Position Command (Clv); Pulse Train Position Command Parameters (Clv); Troubleshooting Pulse Train Position Command (Clv) - Hitachi P1 Basic Instruction Manual

HOOK BLOCK SYNCING / PULSE TRAIN POSITION COMMAND (CLV)

This information is used as reference only and if a field update to hook position sync is required contact Detroit Hoist for assistance to
ensure proper setup. This function is only available when operating in closed loop control mode AA121 = 10.
Hoist block syncing also known as position syncing can be used to maintain hook position between the main and follower hoist VFD.
This function also allows for the hook blocks to be off set. This hook block syncing is typically used when a load beam / spreader beam
Is used with tandem hoists to lift a load and require the hook block positions to maintain position.
HOW IT WORKS – The VFD's use the SN/SP RS485 terminals to send frequency reference, drive status, and command status Modbus
registers values between each other. The VFD's also required the external encoder feedback card (P1-FB) connected. The main hoist
will send a 1:1 pulse train from the encoder card to the pulse train input on the follower encoder card. When in sync mode the
follower VFD will change over to pulse train position command mode and the frequency and position is based on the deviation
between the main and follower. When in pulse train position command mode, the standard acceleration and deceleration times are
ignored and are based on the position loop gain, forward feed gain and the position deviation from the main VFD.
SETUP – This function works in combination with the EZCOM function, please use the EZCOM SETUP GUIDE before configuring the
VFD's for hook block syncing. Once the EZCOM function is configured and communication is verified proceed to the PULSE TRAIN
POSITION COMMAND PARAMETERS.

PULSE TRAIN POSITION COMMAND PARAMETERS (CLV)

Configure the parameters below after the EZCOM parameters have been configured and verified. After settings the parameters below
power down the VFD's and proceed to the PULSE TRAIN POSITION COMMAND WIRING EXAMPLE.
Function
Main Body Encoder Input
P1-FB Encoder Card Encoder PPR
P1-FB Encoder Card Encoder Phase
Pulse train detection selection
Pulse train signal input configuration
Position loop gain
Pulse train position deviation monitor
Position deviation max deviation range
Position deviation max time before error

TROUBLESHOOTING PULSE TRAIN POSITION COMMAND (CLV)

After the wiring and parameters have been set if the follower hoist does not rotate in the correct direction, then you will need to
reverse the pulse train phase by switching the position of the SAP & SAN wires to the position of SBP & SBN. If you receive a E52 speed
deviation error then the phasing of the encoder wires might be backwards, trying to switch the position of the EAP & EAN wires to the
position of EBP & EBN.
Parameter
CA-90 0 = disabled
ob-01
0 = phase-A lead
ob-02 0 = phase-B lead
ob-10
ob-11
AE-07
dA-26
bb-86
bb-87
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Hoist A
512 ppr
(typical)
n/a 01 = pulse train position reference
n/a
n/a
n/a
n/a
n/a
Hoist B
0 = disabled
512 ppr
0 = phase-A lead
0 = phase-B lead
(typical)
00 = 90° shift pulse train
50.00
0 ~ 2147483647 pulses
10240 pulses
1.0 seconds