Reliance electric PSC7000, Operating Instructions Manual

Page: 51 / 84

9-3
9.1 PG Signal Inputs
The Phase A, B and Z of the PG signals are transmitted from the PG encoder mounted on
the servomotor, respectively. The Phase A and B signals generate a balanced rectangular
pulse signal pair having phase difference of 90 degrees, used to detect rotation directions
and speed for the shafts of the servomotor. Z pulse signal is detected at a specific angle only
once per rotation of the servomotor.
The following signal formats can be connected to the PG module:
5V differential signal
12V emitter follower signal
12V totem pole signal
12V open collector signal
5V differential signal and 12V signal have separate input terminals respectively.
You cannot directly input the 5V emitter follower signal, 5V open collector signal or 5V
totem pole signal. For input, an external signal converter must be implemented
separately.
The interface circuit including the terminal block circuit is designed as shown below.
12V Input
5V differential input
820
Ω
1/2W
Terminal Block
CH* A(12)
CH* A(5)
CH* /A
Same circuit for Phase A, B & Z
22
Ω
1/8W
390
Ω
1/8W
47 Ω
1/8W
180pF
Photocoupler Isolation
Fig.9-2 Interface Circuit for PG Signal Input of MCIM-1
ATTENTION
ATTENTION